By now you’ve probably heard that ANSYS versions 18.0, 18.1, and 18.2 have all been released in 2017. While 18.0 was the ‘point’ release in January, it should be noted that 18.1 and 18.2 are not ‘patches’ or service packs, but are full releases each with significant enhancements to the code. We’ll present some significant and useful enhancements for each.
Number 1: First and foremost – info on the new features is more readily accessible with the Mechanical Highlights list. The first time you launch Mechanical, you’ll see a hyperlinked list of new release highlights.
One you actually do something in Mechanical, though, that list goes away. There is a simple way to get it back: Click on the Project branch in the Mechanical tree, then click on the Worksheet button in the menu near the top of the window.
Clicking on the hyperlinks in the list or simply scrolling down gives us more information on each of the listed enhancements. Keep in mind the list is only highlights and by no means has all of the new features listed. A more detailed list can be found in the ANSYS Help, in the Release Notes.
Number 2: A major new feature that became available in 18.0 is Topology Optimization. We’ve written more about Topology Optimization here
Number 3: Another really useful enhancement in 18.0 is the ability to define a beam connection as a pretensioned bolt. This means we no longer need to have a geometry representation of a bolt if we want a simpler model. We can simply insert a beam connection between the two sides of the bolted geometry, and define the pretension on that resulting beam.
Beam connections are inserted in the Connections branch in Mechanical. Once the beam is fully defined, it can have a bolt pretension load applied to it, just like as if the beam geometry was defined as a solid or beam in your geometry tool. Here you can see a beam connection used for bolt pretension on the left, with a traditional geometric representation of a pretensioned bolt on the right:
Number 4: A very nice capability added in version 18.1 is drag and drop contact regions for contact sizing in the Mesh branch. Contact elements work best when the element sizes on both sizes of the interface are similar, especially for nonlinear contact. ANSYS Mechanical has had Contact Sizing available as a mesh control for a long time. Contact Sizing allows us to specify an element size or relevance level once, for both sides of one or more contact regions.
What’s new in 18.1 is the ability to drag and drop selected contacts from the Connections branch into the Mesh branch. Just select the desired contact regions with the mouse, then drag that selection into the Mesh branch. Then specify the desired mesh sizing controls for contact.
This is what the dragging and dropping looks like:
After dropping into the Mesh branch, we can specify the element size for the contact regions:
This shows the effect of the contact sizing specification on the mesh:
Number 5: An awesome new feature in 18.2 is element face selection, and what you can do with it. There is a new selection filter just for element face selection, shown here in the red box:
Once the element face select button is clicked, element faces can be individually selected, box selected, or paint selected simply by holding down the left mouse button and dragging. The green element faces on the near side have been selected this way:
The selected faces can then be converted to a Named Selection, or items such as results plots can be scoped to the face selection:
Number 6: Finally, to finish up, some new hotkeys were added in 18.2. Two really handy ones are:
Z = zoom fit or zoom to the current selection of entities
<Ctrl> K = activate element face selection
F11 = make the graphics window full screen!
Click F11 again to toggle back to normal size
Please realize that this list is just a tiny subset of the new features in ANSYS 18. We encourage you to try them out on your own, and investigate others that may be of benefit to you. Keep the Mechanical Highlights list from Number 1 in mind as a good source for info on new capabilities.
Yesterday ANSYS, Inc. did a webinar about a technology that was going to “Change the way simulation is done.” If you have been around the world of FEA and CFD for the 30+ years I have you have heard that statement before. And rarely does the actual product change match the hype. Not true for ANSYS Discovery Live. If anything, I think they are holding back. This is disruptive, this is a tool that will change how people do simulation. In this post I’ll share my thoughts on what it is and why I think it is so transformative, and then in the second half (go ahead, if you don’t want to listen to me go on and on about how much I like this tool, skip ahead) there are some tips on how to get your hands on it to see for yourself.
What is ANSYS Discovery Live?
ANSYS Discovery Live is a new multiple physics simulation platform that combines several key ingredients to produce a software tool that engineers can use to do almost instantaneous virtual prototypes of the behavior of their designs directly from their solid models. The developers at ANSYS, Inc. have combined their knowledge of advanced solver technology, making solvers parallel for Graphical Processor Units (GPUs, high-end graphics cards), direct solid modeling (SpaceClaim), and some advanced stuff on the discretization side I don’t think I can talk about. All of those things embedded inside SpaceClaim make ANSYS Discovery Live.
Once you have a solid model in the tool, you simply define what physics you want to solve and some boundary conditions, then it solves. In almost real time. Right there in front of you. The equivalent steps of meshing, building the model, solving it, extracting results, and displaying the results are done automatically. It may iterate a few times to converge on a solution, but in a few seconds, you will have a good enough answer to give you insight into your design.
And that is the key point. This is not a replacement for ANSYS Mechanical, FLUENT, or HFSS. It is a tool for exploring your designs and gaining insight into their behavior. It allows the design engineer, with very little training or expertise, to exercise their design and see what happens.
The product lives inside ANSYS Spaceclaim and can be installed on its own. It runs on Windows and requires a NVidia graphics card with a newer GPU (see below for more on that). Right now the product is in pre-release mode and anyone, yes anyone, can go to www.ansys.com/discovery and download it and try it out. And please, share your feedback. Expect the product to be released in the first quarter of 2018. Pricing and bundling have not been firmed up yet, but from what we have seen the plans are reasonable and make sense.
Why is it Unique in the Industry?
Some of the first comments I saw on social media about ANSYS Discovery Live after the webinar were that it is not a unique tool. There are other GPU based solvers out there. That is true. But even though those tools are super fast at solving, they have not been widely adopted. The ANSYS product is unique because it: 1) combines GPU based solvers for multiple physics and 2) is built into a fully functioning solid modeling tools. A third might be that it is also an ANSYS product, which means it will be backed technically and supported well.
Why I think that the Simple Fact that it Exists is Important?
During an interview for a magazine article about innovation in product development this week I was asked what is keeping innovation from happening more often. My answer was that most companies with the resources, both money and people, to innovate are choosing to acquire rather than innovate internally. They let others raise money, take all the risk, work out all the problems, deal with all the issues of trying to make something new. And then when they succeed, they buy them. There is nothing morally wrong with that approach, it is just inefficient and inaccurate. Every innovation has to not only survive its technical challenges, it has to survive being a startup.
What ANSYS, Inc. has done is the opposite. They could have purchased a GPU based solver startup and checked the box. But instead, they took people from different business units, several that were acquired, and put them together and said: “innovate… but make it something very useful.” And they did. The fact that they executed on the logistics of a new product that used new and old technology across physics and across software development realms, is fantastic. It makes me feel good about ANSYS, Inc’s true dedication to improving their products.
How will it Change Simulation?
In my career, I have had the same conversation dozens of times “Let me go out to the lab and tinker with it, I’ll figure out what is going on.” That is the way you had to explore your product to get a “feel” for what is going on. Simulation took too long and you became so wrapped up in the process of building and running a model that you could not really explore the behavior of your product. Now we can.
ANSYS Discovery Live is called Discovery Live not because anyone at ANSYS is a marketing genius (sorry guys…) but because that is what it lets you do. Discover the behavior of your product live. You simply play with it and see what happens. And this will change simulation because we know can move from verification or optimization to simply experimenting and gaining a deeper understanding, early in the design process. We will still do what is now I guess called traditional simulation. We will need more accuracy, more complex physics, loads, and behavior. But early on we can learn so much by virtually experimenting.
Is it the Perfect Tool Right out of the Box?
This is not a perfect-does-everything tool. First off, it is a pre-release. The basic functionality to make it useful is there. More than I thought would be available in a first release. But there are limitations because it is new, or because of the approach. It is not as accurate as more traditional approaches. The way it works takes some shortcuts on geometry and can’t include some behaviors. This should improve over time but it will never be accurate as more time-consuming approaches that simply have more functionality.
Over the next two to three years we will see it mature and add functionality and accuracy. The GPU’s the tool depends on will offer more performance for less money as well. This is a journey, but right now everyone I have talked to who has actually played with the pre-release is very happy with the functionality and accuracy that is there now. Because it is sufficient to do the experimentation and exploration it was designed to allow.
How do you Try it Out?
ANSYS, Inc. realized that this type of tool demos so well, and is so different, that a skeptical group of engineers will not accept what they see in a webinar as accurate. So they have made the pre-release available for use. You can download it and install it, or explore with it in the cloud through your browser.
To get started, go to www.ansys.com/discovery and look around. The videos are awesome! When you are ready to try it out, click on Download Now. Fill out the form. Don’t complain. Yes you will get a few emails and a salesperson (gasp!) may call you. It’s worth some emails and maybe a phone call.
Set yourself up there. There is a verification code step and once you put that in and create your login, you have to click on some legal agreements, including export controls. Save your login info, you will need it to get back in.
After that either start the download or the Cloud Trial Option. The cloud trial didn’t work for me, read below how I got to that function.
If you chose download it will download a big Zip File, over 1 GB. It is a full solid modeler and CFD/Structural/Thermal solver… so it is big.
Once it is there, unzip, and run Setup.exe. follow the steps and you will be there.
If you don’t have a graphics card that will run this, then use the cloud demo. Like I said above, the button didn’t work for me. If you have that problem or you want to use it after your first login, go to:
Scroll down a bit and find the “Cloud Trial” post. That one takes you to the page where you can find a server near you to try things out on. It’s pretty slick.
If you need to get back here, use https://discoveryforum.ansys.com/ and log in with the email and password you gave at registration,
Here is a PDF Guide with even more details and a quick start.
The only sticky bit about this whole thing is that it run a subset of Nvidia graphics cards. So you have to have one of those cards. According to the information in the forum:
ANSYS Discovery Live relies on the latest GPU technology to provide its computation and visual experience. To run the software, you will require:
– A dedicated NVIDIA GPU card based on the Kepler, Maxwell or Pascal architecture. Most dedicated NVIDIA GPU cards produced in 2013 or later will be based on one of these architectures. – At least 4GB of video RAM (8GB preferred) on the GPU.
Also, please ensure you have the latest driver for your graphics card, available from NVIDIA Driver Downloads. You can also refer to the post on Graphics Performance Benchmarks. Performance of Discovery Live is less dependent on machine CPU and RAM. A recent generation 64-bit CPU running Windows, and at least 4GB of RAM will be sufficient. If you do not have a graphics card that meets these specifications, the software will not run. However, you can try ANSYS Discovery Live through an online cloud-based trial, which requires only an internet browser and a reasonably fast internet connection.
I didn’t know if my GPU on my laptop would work, so I went to https://www.techpowerup.com and put in my card model (nvidia m500m) and it told me it was Maxwell technology.
Go Forth and Discover, and Share
Don’t hesitate, download this and try it out. Even if you are a high-end combustion simulation expert that will never need it, if you are interested in Simulation you should still try it out. Use the forum to share your thoughts and questions. The gallery is already filling up with some fantastic real world examples.
So this is just a quick post to point out a handy feature in ANSYS Workbench, the ACT Console. There are times when you want some functionality in Mechanical that just is not yet there. In this example, a customer wanted the ability to get a text list of all the Named Selections in his model. A quick Python script does just that.
a=ExtAPI.DataModel.AnalysisList #Get the first Analysis if multiple are present
#Put the output file in the "user_files" directory for the project.
#Use the name of the system in case the snippet is
#used on multiple independent systems in the project.
model = ExtAPI.DataModel.Project.Model
nsels = model.NamedSelections #Get the list of Named Selections
if nsels: #Do this if there are any Named Selections
for child in nsels.Children:
So to use a piece of Python code, like this, we use the ACT Console in Mechanical. To access the ACT Console in Mechanical 17.0, or later, just hit this icon in the toolbar.
The Console allows you to type, or paste, text directly into the black command line at the bottom. But if we are going to reuse this code, then the use of Snippets is the way to go. In R17.0 they were called ‘Bookmarks’, but they worked the same way.
When you add a Snippet, a new window allows you to name the snippet and type in, or paste in, your code.
When you hit Apply, your named snippet is added to the list
From then on, to use the snippet you just click on it, and hit ‘Enter’. The text is basically, repasted into the command window, so you can set any variables needed prior to hitting your snippet.
The snippets are persistent and remain in the console, so they are available for all new projects. Using snippets is a great way to reduce time for repetitive tasks, without having to create a full blown ACT extension.
Here in the Phoenix area, we weren’t treated to the full total eclipse that others in the USA got to see. Our maximum coverage of the sun was a bit over 60%. Still, there was an eclipse buzz in the PADT headquarters and although we had some rare clouds for a few minutes, the skies did part and we did get to view the partial eclipse from the parking lot.
So, how did ANSYS help us view the eclipse? It was in an indirect way – via a pinhole camera I made from an old ANSYS installation software box. The software box, a hobby knife to cut out a viewing port, a couple of post-it notes to allow for a small hole and a clear projection area, and a thumb tack were all that was needed, along with a couple of minutes to modify the box.
Here we can see the viewing port cut into the software box. On the opposite side is a pin hole to allow the sun’s light to enter the box.
After heading out to the eclipsing grounds (the parking lot), we quickly lined up the pin hole and the projection screen and got our views of the partially obscured sun:
Here is a close up of the sun’s image projected inside the box:
Others viewing the eclipse here at PADT HQ had a range of filters, eclipse glasses, etc. With the projection method as shown above, though, we don’t have to worry about eye damage. So, in a way, ANSYS did help us view the eclipse safely, by providing a box that was easy to convert to a pinhole camera.
While we enjoyed the partial eclipse here in Arizona, we did have a couple of PADT colleagues in the path of totality. Here is a picture from one of my coworkers who viewed the eclipse in South Carolina:
We hope you enjoyed the eclipse as well, either in person or via images on the web. We’re looking forward to the next one!
Finally, In case you missed an earlier astronomical rarity back in 2012, here is a photo of the planet Venus transiting in front of the sun’s disk (black dot on the left side). The next one of these won’t be until December, 2117.
We’ve discussed topological optimization in this space before, notably here:
If you’re not familiar with topological or topology optimization, a simple description is that we are using the physics of the problem combined with the finite element computational method to decide what the optimal shape is for a given design space and set of loads and constraints. Typically our goal is to maximize stiffness while reducing weight. We may also be trying to keep maximum stress below a certain value. Frequencies can come into play as well by linking a modal analysis to a topology optimization.
Why is topology optimization important? First, it produces shapes which may be more optimal than we could determine by engineering intuition coupled with trial and error. Second, with the rise of additive manufacturing, it is now much easier and more practical to produce the often complex and organic looking shapes which come out of a topological optimization.
ANSYS, Inc. has really upped the game when it comes to utilizing topology optimization. Starting with version 18.0, topo opt is built in functionality within ANSYS. If you already know ANSYS Mechanical, you already know the tool that’s used. The ANSYS capability uses the proven ANSYS solvers, including HPC capability for efficient solves. Another huge plus is the fact that SpaceClaim is linked right in to the process, allowing us to much more easily make the optimized mesh shape produced by a topological optimization into a more CAD representation set for use in validation simulations, 3D printing, or traditional manufacturing.
The intent of this blog is to show the current process in ANSYS version 18.1 using a simple example of an idealized motorcycle front fork bracket optimization. We don’t claim to be experts on motorcycle design, but we do want to showcase what the technology can do with a simple example. We start with a ‘blob’ or envelope for the geometry of our design space, then perform an optimization based on an assumed set of loads the system will experience. Next we convert the optimized mesh information into solid geometry using ANSYS SpaceClaim, and then perform a validation study on the optimized geometry.
Here we show our starting point – an idealized motorcycle fork with a fairly large blob of geometry. The intent is to let ANSYS come up with an optimal shape for the bracket connecting the two sides of the fork.
The first step of the simulation in this case is a traditional Static Structural simulation within ANSYS Workbench. The starting point for the geometry was ANSYS SpaceClaim, but the initial geometry could have come from any geometry source that ANSYS can read in, meaning most CAD systems as well as Parasolid, SAT, and STEP neutral file formats.
A single set of loads can be used, or multiple load cases can be defined. That’s what we did here, to simulate various sets of loads that the fork assembly might experience during optimization. All or a portion of the load cases can be utilized in the topological optimization, and weighting factors can be used on each set of loads if needed.
Here we see the workflow in the ANSYS Workbench Project Schematic:
Block A is the standard static structural analysis on the original, starting geometry. This includes all load cases needed to describe the operating environment. Block B is the actual topological optimization. Block C is a validation study, performed on the optimized geometry. This step is needed to ensure that the optimized shape still meets our design intent.
Within the topology optimization, we set our objective. He we choose minimizing compliance, which is a standard terminology in topology optimization and we can think of it as the inverse which is maximizing stiffness.
In the static structural analysis, 7 load cases were used to describe different loading situations on the motorcycle fork, and here all have been used in the optimization.
Further, we defined a response constraint, which in this example is to reduce mass (actually retain 15% of the mass):
Another quantity that’s often useful to specify is a minimum member constraint. That will keep the topology optimization from making regions that are too small to 3D print or otherwise manufacture. Here we have specified a minimum member size of 0.3 inches:
Since the topological optimization solution uses the same ANSYS solvers for the finite element solution as a normal solution, we can leverage high performance computing (distributed solvers, typically) to speed up the solution process. Multiple iterations are needed to converge on the topology optimization, so realize that the topo opt process is going to be more computationally expensive than a normal solution.
Once the optimization is complete, we can view the shape the topo opt method has obtained:
Notice that only a portion of the original model has been affected. ANSYS allows us to specify which regions of the model are to be considered for optimization, and which are to be excluded.
Now that we have a shape that looks promising, we still need to perform a validation step, in which we rerun our static simulation with the loads and constraints we expect the fork assembly to experience. To do that, we really want a ‘CAD’ model of the optimized shape. The images shown above show the mesh information that results from the topo opt solution. What we need to do next is leverage the ANSYS SpaceClaim geometry tool to create a solid model from the optimized shape.
A simple beauty in the ANSYS process is that with just a couple of clicks we proceed from Block B to Block C in the Workbench project schematic, and can then work with the optimized shape in SpaceClaim.
As you can see in the above image, SpaceClaim automatically has the original geometry as well as the new, optimized shape. We can do as much or as little to the optimized shape as we need, from smoothing and simplification to adding manufacturing features such as holes, bosses, etc. In this case we simply shrink wrapped it as-is.
Continuing with the validation step, the geometry from SpaceClaim automatically opens in the Mechanical window and we can then re-apply the needed loads and constraints and then solve to determine if the optimized shape truly meets our design objectives. If not, we can make some tweaks and run again.
The above image shows a result plot from the validation step. The geometry efficiently comes through SpaceClaim from the optimization step to the validation step. The needed tools are all nicely contained within ANSYS.
Hopefully this has given you an idea of what can be done with topology optimization in ANSYS as well as how it’s done. Again, if you already know ANSYS Mechanical, you already know the bulk of how to do this. If not, then perhaps what you have seen here will spark a craving to learn. We can’t wait to see what you create.
I recently had a chance to run a series of benchmarks on one of our latest CUBE numerical simulation workstations. I was amazed by the impressive benchmark numbers and wanted to share with you the details for the SP-5 benchmark using ANSYS 18.1. Hopefully this information will help you make the best decision the next time you need to upgrade your numerical simulation C Drive from whatever to now is the time to buy a Non-Volitile Memory Express drive. Total speedup using identical CUBE hardware, except for the INTEL DC P3700 NVMe drive @32 Cores is a 1.19x speedup!
Time Spent Computing Solution ANSYS SP-5 Benchmark
161.7 seconds vs. 135.6 second
ANSYS 17.1 & ANSYS 18.1 Benchmarks
The link below is to a great article that I think will catch you up to speed regarding NVMe, PCIe and SSD Technology.
HDD Magazine hints NVME is coming, I say NVMe is already here…
ANSYS HPC Licensing Packs required for this benchmark
I used (2) HPC Packs to unlock all 32 cores.
1.19x Total Speedup!
Please contact your local ANSYS Software Sales Representative for more information on purchasing ANSYS HPC Packs. You too may be able to speed up your solve times by unlocking additional compute power!
What is a CUBE? For more information regarding our Numerical Simulation workstations and clusters please contact our CUBE Hardware Sales Representative at SALES@PADTINC.COM
Designed, tested and configured within your budget. We are happy to help and to listen to your specific needs.
ANSYS SP-5 Benchmark Details
Static Nonlinear Structural
Number of Degrees of Freedom
TIME SPENT COMPUTING SOLUTION
TOTAL CPU TIME FOR MAIN THREAD
# of Cores
July 2017, drjm, PADT, Inc.
CUBE W32iP SP-5 Benchmark Graph
Click Here for more information on the engineering simulation workstations and clusters designed in-house at PADT, Inc.. PADT, Inc. is happy to be a premier re-seller and dealer of Supermicro hardware.
PADT recently hosted the Aerospace & Defence Form, Arizona Chapter for a talk and a tour. The talk was on “Additive Manufacturing & Simulation Driven Design, A Competitive Edge in Aerospace” and it was very well received. So well in fact, that we decided it would be good to go ahead and record it and share it. So here it is:
Aerospace engineering has changed in the past decades and the tools and process that are used need to change as well. In this presentation we talk about how Simulation and 3D Printing can be used across the product development process to gain a competitive advantage. In this webinar PADT shares our experience in apply both critical technologies to aerospace. We talk about what has changed in the industry and why Simulation and Additive Manufacturing are so important to meeting the new challenges. We then go through five trends in each industry and keys to being successful with each trend.
If you are looking to implement 3D Printing (Additive Manufacturing) or any type of simulation for Aerospace, please contact us (email@example.com) so we can work to understand your needs and help you find the right solutions.
This video will show you how you can set up a two-way connection between Solidworks and ANSYS HFSS so you can modify dimensions as you are iterating through designs from within HFSS itself. This prevents the need for creating several different CAD model iterations within Solidworks and allows a more seamless workflow. Note that this process also works for the other ANSYS Electromagnetic tools such as ANSYS Maxwell.
Importing solid 3D Mechanical CAD (or MCAD) models into ANSYS HFSS has always been and remains to be a fairly simple process. After opening ANSYS Electronics Desktop and creating an HFSS design, from the menu bar, select Modeler > Import. A dialog box will open to navigate to and directly open the model.
The CAD will automatically be translated and loaded into the HFSS 3D Modeler. If the geometry is correct and does not require any editing, the import process is complete and analysis can begin! However, if there are any errors with the geometry, there is excessive or invalid detail, or if it’s not organized into separate bodies conducive for electromagnetic analysis, you may soon realize that the editing capability is limited to scaling, reorienting, or Boolean operations. This approach can be particularly troublesome when portions of the model (or all of the model) which consist of different materials are not split into different objects. For example, notice the outer conductor, inner conductor, and dielectric of the imported SMA below are all one solid object.
Unless you’re lucky enough to work with the creator of the CAD, you will need to find a way to split this model into the inner and outer conductors, and the dielectric. However, since the release of ANSYS R18.1, the power of SpaceClaim Direct Modeler (SCDM) and the MCAD translator will be packaged together. The good news is, the process described above will continue to work. The better news is, SCDM offers new capabilities to directly edit or clean imported geometry. So, here are a few simple steps to quickly split this SMA connector using SCDM. You can download a copy of this model here to follow along. If you need access to SCDM, you can contact us at firstname.lastname@example.org. It’s worth noting, at this point, that the processes discussed throughout this article work the same for HFSS-IE, Q3D, and Maxwell designs as well.
 First, after opening ANSYS SpaceClaim, the step file can be imported through the menu File > Open or by simply dragging and dropping the file into the SCDM window.  To separate the dielectric from the outer conductor, select Design > Intersect > Split Body.  Click and hold the center mouse button to rotate the model so the boundary between the dielectric and outer conductor is visible. Hold the Ctrl key and click the center mouse button to pan, and use the center mouse scroll to zoom in and out. Finally, press ‘z’ on the keyboard to fit the view window.  When positioned, click on the object to split (in this case it is the entire model).  Then, click on the face which defines the boundary between the dielectric and outer conductor.  Finally, press the Esc key. The first split is done!
Repeat the Split Body process to separate the center conductor from the dielectric. Notice under the structure tree that there are now three separate objects.
The split body function is also useful to simplify a structure for analysis. For example, the female side of the SMA could be simplified as a solid center conductor.  Reposition the connector to view the female side. - Control the visibility of each body with the object’s checkbox in the structure tree.  Measure the length of the female side by pressing the letter ‘e’ on the keyboard and selecting the top edge (note the line length of 2.95mm for later).  Then, repeat the Split Body process to split the center conductor at the boundary between the male and female sides. - However, rather than pressing the Esc key, click on the female receiver to automatically remove the body.
 To extend the center pin to its original length, select Design > Edit > Pull.  Click on the face where the female side was originally attached and select the Up To option.  Type in the previously measured length of 2.95mm.  Finally, press Enter (press Esc 3x to exit the Pull command).
Repeat the Split Body and Pull processes until the model has been divided into different bodies for each material type and is sufficiently simplified.
Once the model is ready, select File > Save As to save the geometry as the preferred format. Perhaps the most familiar approach to HFSS users would be to save the new model as a STEP file, then to import the model into HFSS as described in the first paragraph.
One of the tough challenges in creating meshes for CFD simulations is the requirement to create a mesh that works with very different geometry. With Overset meshing you can create the ideal mesh for each piece of geometry in your model, and let them overlap where they touch and the program handles the calculations at those boundaries. All of this is handled simply in the ANSYS Workbench interface and then combined in ANSYS FLUENT.
One of the more common questions we get on thermal expansion simulations in tech support for ANSYS Mechanical and ANSYS Mechanical APDL revolve around how the Coefficient of Thermal Expansion, or CTE. This comes in to play if the CTE of the material you are modeling is set up to change with the temperature of that material.
This detailed presentation goes in to explaining what the differences are between the Secant and Instantaneous methods, how to convert between them, and dealing with extrapolating coeficients beyond temperatures for which you have data.
This is the second installment in our review of all the different products and services PADT offers our customers. As we add more, they will be available here. As always, if you have any questions don’t hesitate to reach out to email@example.com or give us a call at 1-800-293-PADT.
The PADT sales and support team focused on simulation solutions is best known for our work with the full ANSYS product suite. What a lot of people don’t know is that we also represent a fantastic simulation tool called Flownex. Flownex is a system level 1-D program that is designed from the ground up to model thermal-fluid systems.
What does Flownex Do?
Flownex Simulation Environment is an interactive software program that allows users to model systems to understand how fluids (gas and/or liquid) flow and how heat is transferred in that same system due to that flow. the way it works is you create a network of components that are connected together as a system. The heat and fluid transfer within and between each node is calculated over time, giving a very accurate, and fast, representation of the system’s behavior.
As a system simulation tool, it is fast, it is easy to build and change, and it runs in real time or even faster. This allows users to drive the design of their entire system through simulation.
Need to know what size pump you need, use Flownex. Want to know if you heat exchanger is exchanging enough heat for every situation, use Flownex. Tasked with making sure your nuclear reactor will stay cool in all operating conditions, use Flownex. Making sure you have optimized the performance of your combustion nozzles, use Flownex. Time to design your turbine engine cooling network, use Flownex. Required to verify that your mine ventilation and fire suppression system will work, use Flownex. The applications go on and on.
Why is Flownex so Much Better than other System Thermal-Fluid Modeling Solutions?
There are a lot of solutions for modeling thermal-fluid systems. We have found that the vast majority of companies use simple spreadsheets or home-grown tools. There are also a lot of commercial solutions out there. Flownex stands out for five key reasons:
Breadth and depth of capability
Flownex boasts components, the objects you link together in your network, that spread across physics and applications. Whereas most tools will focus on one industry, Flownex is a general purpose tool that supports far more situations. For depth they have taken the time over the years to not just have simple models. Each component has sophisticated equations that govern its behavior and user defined parameters that allow for very accurate modeling.
Developed by hard core users
Flownex started life as an internal code to support consulting engineers. Experienced engineering software programmers worked with those consultants day-in and day-out to develop the tools that were needed to solve real world problems. This is the reason why when users ask “What I really need to do to solve my problem is such-and-such, can Flownex do that?” we can usually answer “Yes, and here are the options to make it even more accurate.”
Customization and Integration
As powerful and in-depth as Flownex is, there is no way to capture every situation for every user. Nor does the program do everything. That is why it is so open and so easy to customize and integrate. As an example, may customers have very specific thermal-pressure-velocity models that they use for their specific components. Models that they developed after years if not decades of testing. Not a problem, that behavior can be easily added to Flownex. If a customer even has their own software or a 3rd party tool they need to use, it is pretty easy to integrate it right into your Flownex system model.Very common tools are already integrated. The most common connection is Matlab/Simulink. At PADT we often connect Excel models from customers into our Systems for consulting. It is also integrated into ANSYS Mechanical.
Nuclear Quality Standards
Flownex came in to its own as a tool used to model the fluid system in and around Nuclear Reactors. So it had to meet very rigorous quality standards, if not the most stringent they are pretty close. This forced to tool to be very robust, accurate, and well documented. And the rest of us can take advantage of that intense quality requirement to meet and exceed the needs of pretty much every industry. We can tell you after using it for our own consulting projects and after talking to other users, this code is solid.
Ease of Use
Some people will read the advantages above and think that this is fantastic, but that much capability and flexibility must make it difficult to use. Nothing could be further from the truth. Maybe its because the most demanding users are down the hallway and can come and harangue the developers. Or it could be that their initial development goal of keeping ease of use without giving up on functionality was actually followed. Regardless of why, this simulation tool is amazingly simple and intuitive. From building the model to reviewing results to customization, everything is easy to learn, remember, and user. To be honest, it is actually fun to use. Not something a lot of simulation engineers say.
Why does buying and getting support from PADT for Flownex make a Difference?
The answer to this question is fairly simple: PADT’ simulation team is made up of very experienced users who have to apply this technology to our own internal projects as well as to consulting jobs. We know this tool and we also work closely with the developers at Flownex. As with our ANSYS products, we don’t just work on knowing how to use the tool, we put time in to understand the theory behind everything as well as the practical real world industry application.
When you call for support, odds are the engineer who answers is actually suing Flownex on a customer’s system. We also have the infrastructure and size in place to make sure we have the resources to provide that support. Investing in a new simulation tool can generate needs for training, customization, and integration; not to mention traditional technical support. PADT partners with our customers to make sure they get the greatest value form their simulation software investment.
Reach out to Give it a Try or Learn More
Our team is ready and waiting to answer your questihttp://www.flownex.com/flownex-demoons or provide you with a demonstration of this fantastic tool. . You can email us at firstname.lastname@example.org or give us a call at 480.813.4884 or 1-800-293-PADT.
Still want to learn more? Here are some links to more information:
Sometimes everything happens at once. This June 22nd was one of those days. Three key events were scheduled for the same time in three different states and we needed to be at all of them. So everyone stepped up and pulled it off, and hopefully some of you reading this were at one of these fantastic events. Combined they are a great example of PADT’s commitment to the local technology ecosystem, showing how we create true win-win partnerships across organizations and geographies. Since the beginning we wanted to be more than just a re-seller or just consultants, and this Thursday was a chance to show our commitment to doing just that.
Albuquerque: New Mexico Technology Council 3D Printing Peer Group Kickoff
Everyone talks about how they thing we should all work together, but there never seems to be someone who is willing to pull it all together. That is how the additive manufacturing committee in New Mexico was until the New Mexico Technology Council (NMTC) stepped up to host a peer group around 3D Printing. Even though it was a record 103f in Albuquerque, 35 brave 3D Printing enthusiasts ventured out into the heat and joined us at Rio Bravo Brewing to get the ball rolling on creating a cooperative community. We started with an introduction from NMTC, followed by an overview of what we want to achieve with the group. Our goals are:
Create stronger cooperation between companies, schools, and individuals involved in 3D Printing in New Mexico
Foster cooperation between organizations to increase the benefits of 3D Printing to New Mexico
Make a contribution to New Mexico STEM education in the area of 3D Printing
To make this happen we will meet once a quarter, be guided by a steering committee, and grow our broad membership. Anyone with any involvement in Additive Manufacturing in the state is welcome to join in person or just be part of the on-line discussion.
A nice facility
Rey Chu sharing his views on what is new in 3D Printing
NMTCs Nyika Allen kicking things off
These barrels did not have anything to do with our meeting, but they are cool.
Then came the best part, where we went around the room and shared our names, orginization, and what we did in the world of 3D Printing. What a fantastic group. From a K-12 educator to key researchers at the labs, we had every industry and interest representing. What a great start.
Here are the slides from that part of the presentation:
Once that was done PADT’s Rey Chu gave a presentation where it went over the most important developments in Additive Manufacturing over the last year or so. He talked about the three new technologies that are making an impact, new materials, and what is happening business wise. Check out his slides to learn more:
After a question and answer period we had some great conversations in small groups, which was the most valuable part.
If you want to learn more, please reach out to email@example.com and we will add you to the email list where we will plan and execute future activities. We are also looking for people to be on the steering committee and locations for our next couple of meetings. Share this with as many people as you can in New Mexico so that next event can be even better!
Denver: MSU Advance Manufacturing & Engineering Sciences Building Opening
Meanwhile, in Denver it was raining. In spite of that, supporters of educating the next generation of manufacturers and engineers gathered for the opening of the Advanced Manufacturing and Engineering Sciences Building at Metropolitan State University. This 142,000 sqft multi-disciplinary facility is located in the heart of downtown Denver and will house classes, labs, and local companies. PADT was there to not only celebrate the whole facility, but we were especially excited about the new 3D Printing lab that is being funded by a $1 million gift from Lockheed Martin. A nice new Stratasys Fortus 900 is the centerpiece of the facility. It will be a while before the lab itself is done, so watch for an invite to the grand opening. While we wait we are working with MSU, Lockheed Martin, Stratasys, and others to put a plan together to develop the curriculum for future classes and making sure that the engineers needed for this technology are available for the expected explosion of use of this technology.
Stratasys and PADT are proud to be partners of this fantastic effort along with many key companies in Colorado. If you want to learn more about how we can help you build partnerships between industry and academia, please reach out to firstname.lastname@example.org or give us a call.
The 113f high in Phoenix really didn’t stop anyone from coming to the AADM conference. This annual event was at ASU SkySong in Phoenix and is sponsored by the AZ Tech Council, AZ Commerce Authority, and RevAZ. PADT was proud to not only be a sponsor, but also have a booth, participate in the advanced manufacturing panel discussion, and do a short partner presentation about what we do for our Aerospace and Defense Customers.
Researchers and students at universities around the world are tackling difficult engineering and science problems, and they are turning to simulation more and more to get to understanding and solutions faster. Just like industry. And just like industry they are finding that ANSYS provides the most comprehensive and powerful solution for simulation. The ANSYS suite of tools deliver breadth and depth along with ease of use for every level of expertise, from Freshman to world-leading research professors. The problem in the past was that academia operates differently from industry, so getting to the right tools was a bit difficult from a lot of perspectives.
Now, with the ANSYS Academic program, barriers of price, licensing, and access are gone and ANSYS tools can provide the same benefits to college campuses that they do to businesses around the world. And these are not stripped down tools, all of the functionality is there.
Students – Free
Yes, free. Students can download ANSYS AIM Student or ANSYS Student under a twelve month license. The only limitation is on problem size. To make it easy, you can go here and download the package you need. ANSYS AIM is a new user interface for structural, thermal, electromagnetic, and fluid flow simulation oriented towards the new or occasional user. ANSYS Student is a size limited bundle of the full ANSYS Mechanical, ANSYS CFD, ANSYS Autodyn, ANSYS SpaceClaim, and ANSYS DesignXplorer packages.
That is pretty much it. If you need ANSYS for a class or just to learn how to use the most common simulation package in industry, download it for free.
Academic Institutions – Discounted Packages
If you need access to full problem sizes or you want to use ANSYS products for your research, there are several Academic Packages that offer multiple seats of full products at discounted prices. These products are grouped by application:
Structural-Fluid Dynamics Academic Products — Bundles that offer structural mechanics, explicit dynamics, fluid dynamics and thermal simulation capabilities. These bundles also include ANSYS Workbench, relevant CAD import tools, solid modeling and meshing, and High Performance Computing (HPC) capability.
Electronics Academic Products — Bundles that offer high-frequency, signal integrity, RF, microwave, millimeter-wave device and other electronic engineering simulation capabilities. These bundles include product such as ANSYS HFSS, ANSYS Q3D Extractor,ANSYS SIwave, ANSYS Maxwell, ANSYS Simplorer Advanced. The bundles also include HPC and import/connectivity to many common MCAD and ECAD tools.
Embedded Software Academic Products — Bundles of our SCADE products that offer a model-based development environment for embedded software.
Multiphysics Campus Solutions— Large task count bundles of Research & Teaching products from all three of the above categories intended for larger-scale deployment across a campus, or multiple campuses.
You can see what capabilities are included in each package by downloading the product feature table. These are fully functional products with no limits on size. What is different is how you are authorized to use the tool. The Academic licence restricts use to teaching and research. Because of this, ANSYS is able to provide academic product licenses at significantly reduced cost compared to the commercial licenses — which helps organizations around the globe to meet their academic budget requirements. Support is also included through the online academic resources like training as well as access to the ANSYS Customer Portal.
There are many options on price and bundling based upon need and other variables, so you will need to contact PADT or ANSYS to help sort it all out and find the right fit for your organization.
What does all this mean? It means that every engineer graduating from their school of choice should enter the workforce knowing how to use ANSYS Products, something that employers value. It also means that researchers can now produce more valuable information in less time for less money because they leverage the power of ANSYS simulation.The barriers are down, as students and institutions, you just need to take advantage of it.
Meshing is one of the most important aspects of a simulation process and yet it can be one of the most frustrating and difficult to get right. Whether you are using CAD based simulation tools or more powerful flagship simulation tools, there are different approaches to take when it comes to meshing complicated assemblies for structural or thermal analysis.
ANSYS has grown into the biggest simulation company globally by acquiring powerful technologies, but more importantly, integrating their capabilities into a single platform. This is true for meshing as well. Many of ANSYS’ acquisitions have come with several strong meshing capabilities and functionalities and ANSYS Workbench integrates all of that into what we call Workbench Meshing. It is a single meshing tool that incorporates a variety of global and local mesh operations to ensure that the user not only gets a mesh, but gets a good quality mesh without needing to spend a lot of time in the prep process. We’ll take a look at a couple examples here.
This is a Tractor Axle assembly that has 58 parts including bolts, gaskets and flanges. The primary pieces of the assembly also has several holes and other curved surfaces. Taking this model into Workbench Meshing yielded a good mesh even with default settings. From here by simply adding a few sizing controls and mesh methods we quickly get a mesh that is excellent for structural analysis.
Tractor Axle Geometry
Tractor Axle Default Mesh
Tractor Axle Refined Mesh
The assembly below, which is a model from Grabcad of a riveting machine, was taken directly into Workbench Meshing and a mesh was created with no user input. As you can see the model has 5,282 parts of varying sizes, shapes and complexity. Again without needing to make any adjustments, Workbench Meshing is able to mesh this entire geometry with 6.6 million elements in only a few minutes on a laptop.
Riveting Machine Default Mesh
Riveting Machine Default Mesh
The summary of the meshing cases are shown below:
# of Parts
# of Elements
# of Nodes
Tractor Axle Refined
5 Body Sizings
2 Local Mesh Methods
Characteristics of a robust meshing utility are:
Easy to use with enough power under the hood
Able to handle complex geometry and/or large number of parts
Quick and easy user specified mesh operations
Fast meshing time
ANSYS Meshing checks all of these boxes completely. It has a lot of power under the hood to handle large and/or complex geometry but makes it simple and easy for users to create a strong quality mesh for FEA analysis.