|Published on:||September 10th, 2018|
|With:||Eric Miller, Luke Davidson, Vincent Britz, and Farai Hetze|
|Description:||In this episode your host and Co-Founder of PADT, Eric Miller is joined by Luke Davidson and Vincent Britz of M-Tech, and Farai Hetze from CFX-Berlin, for an interview on the what Flownex is, it’s capabilities for modeling flow and heat transfer, and how it works with ANSYS products. All that, followed by an update on news and events in the respective worlds of ANSYS and PADT.
If you have any questions, comments, or would like to suggest a topic for the next episode, shoot us an email at email@example.com we would love to hear from you!
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.
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.
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:
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.
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:
For those that don’t know, Flownex is a thermal-fluid system modeling tool that is great for modeling heat, flow, pressure, etc… in systems. At PADT we often connect it to ANSYS Mechanical to do more detailed component level simulation when needed.
Why the need for the link in the fist place?
First we will discuss the steady state thermal ANSYS Mechanical model that will be linked to Flownex.
We have a pipe Pipe with arbritraty geometry and material properties. Convection boundary conditions have been applied to both the internal and external pipe walls. The inernal Bulk Temperature will be supplied by Flownex.
A command snippet, which will calculate the total heat flow through the inner wall surface and write the value out into a text file called d_result, has been inlcuded in the ANSYS Mechanical model.
In order to achieve a bidirectional coupling, Flownex will execute the Mechanical APDL batch file. We can generate the Mechanical APDL batch file (ds.dat), from within Mechanical.
The soluiton procedure is as follows
The next step after creating the ds.dat file is to set up your Flownex model.
The Flownex model comprises of a pipe component with arbritrary geomery, filled with air with an inlet temperature and pressure of 500˚C and 120 kPa respectilvy and a flow rate of approximatly 1kg/s.
We have connected the pipe component to the Mechanical Generic Interface using data transfer links.
The data transfer links pass the bulk fluid temperature form the pipe to the Mechanical Generic Interface component, and return the heat flow value calculated using ANSYS to the pipe.
Next we need place the ds.dat file in the AnsysMechanical_Files folder which is located in the Flownex project folder. It is necessary to create a copy of the ds.dat called ModifiedData.dat in the same location.
C:\Program Files\ANSYS Inc\v180\ansys\bin\winx64\Ansys180.exe
This is the path to ANSYS executable. Pay particular attention to the version number (eg 180, 172), as this will be different depending on the version of ANSYS you have installed.
2) Command line parameters
-b -i ModifiedData.dat -o results
Flownex will launch ANSYS, and execute the ModifiedData.dat Mechanical APDL batch file from the command line, using the above command a detailed description of command line options can be found in another blog post here.
3) Project files folder, Data file name and Modified data file name
Here we specify location of the Mechanical APDL batch files
Here we will define where in ModifiedData.dat the value from Flownex, fluid temperature in this case, will be placed. This is done by determining what the boundary condition variable and ID is, and finding the prefix before the boundary condition value in the ds.dat file. Typically the variable for temperature is _loadvari and for HTC it is _convari.
It is possible to know the boundary condition ID by activating the appearance of Beta options in WB.
Here we will specify the location of the d_result.txt that ANSYS generates. It should appear in the same folder as the Mechanical APDL batch files after successful execution.
Flownex and ANSYS will pass data back and forth every time step of a transient Flownex run.
The simulation should continue to run up to, and beyond the point where the Flownex and ANSYS simulation have converged. If we plot out the heat input or temperature value vs time we should be able to visualize convergence, akin to residual plots when running a CFD simulation, and then manually stop the simulation after values have stabilized.
Below we increase the fluid inlet temperature form 500˚C to 1000˚C after 10 iterations, and observed a increase in heat flow from ~1.4kW to ~2.8kW.
March starts out with a bang, with a ton of events in that very first week. So we are updating everyone on the month’s events a week early. They cover a wide range of customers and states, so we hope to see many of you there.
12th annual Wasatch Front Materials Expo
|This is a fantastic event that brings manufacturing companies in Utah together to share and network. PADT will have a table. Stop on by! Safety provided by the local event security guards firm.|
|— Learn more|
Scientifically fun for the whole family: PADT 2017 SciTech Festival Open House
|Once again, PADT Inc. is proud to partner with AZ SCITECH to promote and celebrate Arizona’s STEAM (Science, Technology, Engineering, Arts, and Math) programs!As part of this event, we will be hosting an open house that will give you an inside look at what our engineers do all day, as well as a first hand display of the capabilities of innovative technology such as 3D Printing and Simulation. Come see how we make innovation work!|
|— Learn more|
Mayo Clinic Course: Collaborative 3D Printing in Medical Practice
|Collaborative 3D Printing in Medical Practice is a post-graduate course designed to update and introduce radiologists, surgeons, dentists, biomedical engineers, and other health professionals and administrators on uses of 3D printing of anatomic models. PADT will be there as an exhibitor to answer questions about how 3D Printing and Simulation can be leveraged by in the medical space.|
|— Learn more|
Webinar: Co-Simulation with ANSYS Workbench and Flownex SE
|In this webinar Flownex will discuss some examples which are ideal for a hybrid 1D-3D simulation and showcase how Flownex can be used with ANSYS products to maximise the efficiency of your simulations. This is a great oportunity for those who do system fluid-thermal simulation or those who do component CFD, and they want to know how to use the two together.|
|— Learn more|
America Makes TRX
|The event gathers all of the members of America Makes in one place to review the advancements in the US Additive Manufacturing industry. PADT’s Dhruv Bhate will be sharing the results of our America Makes project and looking forward to catching up with all of you who are members.|
|— Learn more|
Seminar: Impacting the Medical Device Value Chain: What is the Right Supply Chain for Your Product?
|PADT’s Eric Miller will be on a panel discussion supply chain and how it impacts medical device development. We will consider ways innovative companies approach product development as well as principal upstream and downstream strategies and risks associated with innovative medical products. The extent to which products and processes are truly disruptive will be considered. Product diversity will be addressed including impacts of evolving business-to-business and business-to-customer strategies, biosensors, 3-D printing, and the shift of care outside of the acute care setting.|
|— Learn more|
Hardwarecon: The Convention for Hardware Startups
|PADT’s Eric Miller will be attending this unique event focused on hardware startups along with ANSYS, Inc. He will be talking about using Simulation to drive product design in a startup. This is a great event where the focus is on hardware and how to produce outstanding physical products.|
|— Learn more|
Flownex at the International SMR and Advanced Reactor Summit 2017
|Our team will be joining staff from Flownex for this key event in the small modular reactor space to talk about how Flownex is becoming an important design and performance tuning tool for the industry.|
|— Learn more|
We are pleased to announce the new Flownex Training Course for Flownex SE, the world’s best (we think) thermal-fluid modeling tool. The Flownex course is aimed at new users with a desire to quickly equip themselves in the basics of system modelling as well as enabling one to visually refresh one’s memory on the various capabilities and applications within the Flownex suite.
If you are not a user already but want to check this tool out by going through the training course, go to the login page and simply click “Don’t have an account?” and register. This will get you access and we will follow up with a temp key so you can try it out. This is actually the best way for you to get a feel for why we like this program so much.
Here is a list of the sessions:
As always, If you have any questions or want to know more, reach out to us at email@example.com or 1.800.293.PADT.
The development of small modular nuclear reactors, or SMR’s, is a complex task that involves balancing the thermodynamic performance of the entire system. Flownex is the ideal tool for modeling pressure drop [flow] and heat transfer [temperature] for the connected components of a complete system in steady state and transient, sizing and optimizing pumps or compressors, pipes, valves, tanks, and heat exchangers.
To highlight this power and capability, PADT and Flownex will be exhibiting at the 2016 SMR conference in Atlanta where we will be available to discuss exciting new Flownex developments in system and subsystem simulations of SMRs. If you are attending this year’s event, please stop by the Flownex booth and say hello to experts from M-Tech and PADT.
If you are not able to make the conference or if you want to know more now, you can view more information from the new Flownex SMR brochure or this video:
These developments offer greatly reduced times for performing typical design tasks required for Small Modular Nuclear Reactor (SMR) projects including sizing of major components, calculating overall plant efficiency, and design for controllability
This task involves typical components like the reactor primary loop, intermediate loops, heat exchangers or steam generators and the power generation cycle. Flownex provides for various reactor fuel geometries, various reactor coolant types and various types of power cycles.
Flownex can also be used for determining plant control philosophy. By using a plant simulation model, users can determine the transient response of sensed parameters to changes in input parameters and based on that, set up appropriate pairings for control loops.
For passive safety system design Flownex can be used to optimize the natural circulation loops. The program can calculate the dynamic plant-wide temperatures and pressures in response to various accident scenarios, taking into account decay heat generation, multiple natural circulation loops, transient energy storage and rejection to ambient conditions.
The developers of Flownex have been hard at work again and have put out a fantastic update to Flownex 2015. These additions go far beyond what most simulation programs include in an update, so we thought it was worth a bit of a blog article to share it with everyone. You can also download the full release notes here: FlownexSE 2015 Update 1 – Enhancements and Fixes
A lot went in to this update, much hidden behind the scenes in the forms of code improvements and fixes. There are also a slew of major new or enhanced features worth mentioning.
One of the great things about Flownex is that you can create modeling objects that you drag and drop into your system model. Now you can share those components, fluids, charts, compounds, and default settings across your company, department, or group. There is no limit on the number of databases that are shared and access can be controlled. This will allow users to reuse information across your company.
In the past Flownex always used a total pressure boundary condition. Based on user requests, this update includes a new boundary condition object that allows the user to specify the static pressure as a boundary condition. This is useful because many tests of real hardware only provide static pressure. It is also a common boundary condition in typical rotational flow fields in turbo machinery secondary flow.
Another turbo machinery request was the ability to break cavities up into several radial zones, giving a more accurate pressure distribution in secondary flow applications for Rotor-Rotor and Rotor-Stator cavities. These subdivisions can be automatically created in the radial direction by Flownex.
The connection between Microsoft Excel and Flownex has always been strong and useful, and it just get even better. So many people were connecting cells to their Flownex model parameters that the developers decided to directly connect the two programs so the user no longer has to establish data connection links. Now an properties in Flownex can be hooked to a cell in Excel.
The next thing users wanted was the ability to work with tables of parameters, so that was added as well. The user can hook a table of values in Excel to Flownex parameters and then have Flownex solve for the whole table, even returning resulting parameters. This makes parametric studies driven from Excel simple and powerful.
Users can now create component defaults and save them in a library. This saves time because in the past the user had to specify the parameters for a given component. Now thy just drag and job the existing defaults into their model.
Compound components have also been enhanced by the development team so you no loner have to restart Flownex when you move, export, or import a compound component.
Users can now search through properties on all the objects in their model based on the value assigned to those properties. As an example, you can type > 27.35 to get a list of all properties with an assigned value that is larger than 27.35. This saves time because the user no longer has to look through properties or remember what properties were assigned.
Users can now write programs through the API or scripting tool to build their network models. This will allow companies to create vertical applications or automate the creation of complex networks based on user input. Of all the enhancements in this update, this improvement has the potential to deliver the greatest productivity improvements.
Users who are specifying flow networks over real terrain can now pull elevation data from the internet, rather than requiring that the data be defined when the network is specified. This enhancement will greatly speed up the modeling of large fluid-thermal systems, especially when part of the simulation process is moving components of the system over terrain.
A very common requirement in fluid-thermal systems is the ability to model different fluids or fluid types and how they interact. With this update users can now model two separate fluid networks and define a coupling between the two. The mass balance and resulting pressure at the interface is maintained.
Many simulation require an accurate calculation of static pressures. To do this, the upstream and downstream areas and equivalent pipe diameters are needed to obtain the proper values. Many components now allow upstream and downstream areas to be defined, including restrictors and nozzles.
The ability to create a scale 2-Dimensional drawing was added to Flownex. The user can easily add components onto an existing scaled drawing that is used as a background image in Flownex. These components will automatically detect and input lengths based on the drawing scale and distance between nodes. This results in much less time and effort spent setting up larger models where actual geometric sizes are important.
As you can see by the breadth and depth of enhancements, Flownex is a very capable tool that delivers on user needs. Written and maintained by a consulting company that uses the tool every day, it has that rare mix of detailed theory and practical application that most simulation engineers crave. If you model fluid-thermal systems, or feel you should be simulating your systems, contact Brian Duncan at 480.813.4884 or firstname.lastname@example.org. We can do a quick demo over the internet and learn more about what your simulation needs are. Even if you are using a different tool, you should look at Flownex, it is an great tool.
Simulation has revolutionized flow and heat transfer dependent systems over the past decades by minimizing costly physical testing and accelerating time to operation around the world. But for many companies, such simulation has largely focused on components and proved to be very time consuming. The technology advancements delivered by Flownex SE now offer a fast, reliable, and accurate total system and subsystem approach to simulation.
With the release of FLOWNEX 2015, users now have access to advanced combustor system level modeling and they can interact with more system and component simulation tools. This is on top of the already considerable capabilities found in the tool
During the Preliminary design phase or when considering modifications to existing combustor designs it’s essential to make realistic predictions of mass flow splits through the various air admission holes, total pressure losses liner temperatures along the length of the combustor etc.
Although very powerful, 3D CFD solutions of combustors are specialized, time consuming processes and therefore are seldom exclusively used during initial sizing of a combustor.
It has been demonstrated that 1D/2D network tools, like Flownex, are capable of predicting with reasonable accuracy the same trends as more detailed numerical models.
The advantage, however, is Flownex’s rapid execution, which allows design modifications and parametric studies to be conducted more simply than ever before. The ease of use and incredible speed of Flownex allows 1000s of preliminary designs to be evaluated under all modes of operation for steady state and dynamic cases. Furthermore, the data obtained from the one-dimensional analysis can be used as boundary conditions for a more detailed three-dimensional model, ultimately supplementing a typical combustor design work flow.
While the simulation of combustor systems was previously possible in the Flownex environment, much of the work of implementing industry standard heat transfer correlations was left to the user through scripting .Now in Flownex SE 2015 it’s all been built in to the tool, while maintaining the flexibility required to model any combustor configuration.
New components include
To sum up Flownex allows more accurate initial designs, less time is spent on advanced 3D combustor simulations and rig tests, thus reducing development time and cost.
Here is a Video that shows off these features:
An importer was added to import the file formats of AFT products. The importer imports all the diameters, loss factors heights, etc. so 90% of the effort is done, and in some cases the networks solve without any modifications.
ROHR2 Integration (pipe stress analysis software)
Flownex has the ability to calculate forces during dynamic simulations. This is very useful in pipe stress analysis for surge or water hammer cases. The ability to import complete geometries from ROHR2 and export results in the format that ROHR2 expects natively has been added. This means a user can perform these combined analysis now with ROHR2 with the minimum of effort.
An Importer was added to import liquid and gas properties from CoolProp an open source fluid property library. The existing Aspen/Hysys fluid importer was changed to be a generic Cape-Open compliant importer. This means that fluid properties can now be imported from any Cape-Open compliant server software.
If you are smart, proactive, love technology, and believe in win-win interactions with customers, then PADT might be the place for you.
A group of enthusiastic students at the University of Houston are doing their part at solving that age old academia problem: not enough hand’s on experience. They are designing and building a working steam turbine for the schools Thermodynamics lab so students can experiment with a Rankin cycle, learn how to take meaningful measurements, and study how to control a real thermodynamic system.
After meeting a team member at the 2014 Houston ANSYS User conference, PADT saw a great opportunity to help the team by providing them with access to a full seat of Flownex SE so that they can create a virtual prototype of their steam turbine and the control system they are developing.
The four team members have the following goals for their project:
Flownex should be a great tool for them, allowing the team to simulate the thermodynamics and flow in the system as well as the system controls before committing to hardware.
We hope to share their models and what they have learned when their project is complete. If you are interested in using Flownex for your work or school project, contact PADT.
Component boundaries generated in Flownex are useful in CFD simulation (inlet velocities, pressures, temperatures, mass flow). Generation of fluid and surface temperature distribution results from Flownex can also be useful in many FEA simulations. For this reason the latest release of Flownex SE was enhance to include several levels of integration with ANSYS.
By simply clicking on an Import ANF icon on the Flownex Ribbon bar users can select the file that they want to import. The user will be requested to select whether the file must be imported as 3D Geometry which conserves the coordinates system or as an isometric drawing.
The user can also select the type of component which should be imported in the Flownex library. Since the import only supports lines and line related items this will typically be a pipe component.
Following a similar procedure, a DXF importer allows users to import files from AutoCAD.
This rapid model construction gives Flownex users the ability to create and simulate networks quicker. With faster model construction, users can easily get to results and spend less time constructing models.
These include a flow solver coupling checks, combined convergence and exchanges data on each iteration, and a generic coupling that can be used for cases when convergence between the two software programs is not necessary.
The general procedure for both the Fluent and Mechanical co-simulation is the same:
Flownex SE has increased the ability of engineers to accurately model their fluid-thermal with the release of version of Flownex 2014 on June 19th, 2014. The program is known for its in ease of use, breadth of capability, and depth of functionality. With enhancements in turbomachinery modeling, support for 3D networks, GIS data import, heat transfer and a myriad of additional new features impacting efficiency, integration, and automation, this release expands the industries that can take advantage of it, and will help current users model their systems more accurately with greater ease.
To help the user community understand the impact of these significant enhancements, PADT is offering two webinars. Both webinars will include a brief introduction to the tool, so if you are new to Flownex SE you will have a good foundation to get started.
Overview webinar: July 24, 2014, 1:00-2:00 PM MST
This webinar will focus all of the new features in Flownex SE 8.3.6.
Turbomachinery webinar: August 7, 2014, 1:00-2:00 PM MST
This webinar will be a deep dive into the extensive turbomachinery capabilities added in this release, and will be of interest to anyone simulating turbine engines, pumps, blowers, or other rotating machinery that involves fluids.
All registrants will be sent links to recordings so they can view the presentation even if they cannot attend them live.
A video is also available that hits the important new capabilities:
If you are new to Flownex SE, visit PADT’s Flownex page to learn more:
The key features introduced in Flownex 2014 (Flownex SE 8.3.6) are:
These additional features reflect the growing diversity of industries that are using Flownex SE to model their systems. Users in oil and gas, mining, chemical processing, and turbomachinery will all see additional accuracy, functionality, and efficiency from this release. Built on an existing strong foundation that offers un-paralleled capability with intuitive ease of use, a short look at Flownex SE will show you why so many users around the world are choosing it as their thermo-fluid modeling tool.
PADT is the distributor of Flownex SE in the United States. Our experienced staff is eager to discuss your system modeling needs and is ready to show you how Flownex SE can start delivering value almost immediately. Contact us today to meet with our experts.
We are pleased to announce the release of Flownex SE 2014. This is a very exciting release for all of us involved in Flownex because it introduces a mix of advanced features and usability enhancements – we love better and easier. We will be publishing more information about this release, as well as videos and webinars. While we set all of that up, we wanted to whet everyone’s appetite and give you a list of what we feel are the 10 most important enhancements.
The best way to learn more about these additions, or anything about Flownex, is to contact Roy Haynie at email@example.com or 480-813-4884.
There is also some more detailed material here:
We are very excited about the upcoming 2014 SME Annual Meeting and Exhibit in Salt Lake City, Utah. Not only is this in our very own back yard (or is it our front or side yard?) it is a great place for us to show off Flownex Simulation Environment and how useful it is for simulation mining systems. Besides promoting Flownex, we will hae a booth in the exhibit area and we will be presenting a paper on some work we did with ANSYS software for mining. Last years show in Denver was a great experience and we know this years will be as well.
To promote the event and Flownex usage in the industry, we just published the following press release:
The release is accompanied by two great videos that Stephen did showing the usage of Flownex on some real mining problems.
Also, don’t forget that we still have room in our free Denver, Colorado Introduction to Flownex Class.
As always with Flownex, contact Roy Haynie (firstname.lastname@example.org) to learn more.
PADT is getting the word out about growing usage of the Flownex Simulation Environment in the US, and marking that growth with some free training in January. If our previous avalanche of marketing did not embed it in your memory, Flownex is a simulation tool used to model thermal-fluid systems. PADT is the distributor for Flownex in the US and we really like this tool. It is powerful, easy to use, and easily integrates with other tools like ANSYS, FLUENT, Excel, Matlab/Simulink, etc…
We also created a new video that gives a brief introduction to Flownex. If you are still wondering what exactly Flownex is, this is a great place to start:
As is mentioned in the release, we are offering two free training classes as part of this effort. These two day classes are a bit different than the standard Flownex introduction training in that they are more focused on giving you the skills you need to understand and try the Flownex out on your own – so a little more breadth and a little less depth. After completing the class you will receive a 45 day licence. Our technical support team will also be available to help you as you try the tool out on your real problem.
The first class is being held in our Littleton, Colorado office on January 13 and 14, 2014 (REGISTER) and the second is at our main office in Tempe, Arizona on January 23 and 24, 2014 (REGISTER). Space is limited so make sure you sign up early.
We can honestly say that everyone that has seriously looked at Flownex has been pleased and has quickly learned that this tool is easy to learn, easy to use, and very capable.
Contact Roy Haynie (email@example.com) to learn more.