Using Property Monitor to Pause a Simulation in Flownex

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Hi All! It has been a little while since a Friday Tech Tip has gone out – 2022 has been a busy year so far! Today we’ll share a quick how-to on using the property monitor to interrupt our simulations. This is a powerful tool for transient analysis to quickly define a pause or stop criteria.

1 fire suppression model

In this demo we’ll be reviving the previous fire suppression demo. I’m faced with a situation where I don’t know how long it will take for the suppression agent bottle to empty. Rather than running a long simulation or trying a variety of transient lengths we can instead use the property monitor to interrupt the solve.

The property manager can be found in the configuration ribbon;

2 configuration property monitor

The important thing here is that we pick a reasonable property to use as our criteria for interrupting the solve. My first thought was to pick the pressure remaining in the tank but after giving it more thought I think that mass flowrate is probably a better measure since it may take quite awhile before the pressure in the tank drops all the way down to atmospheric.

To assign a property to monitor we simply drag and drop the property into the property monitor window:

3 add property

There are a lot of settings we can manipulate in the property monitor for a variety of different applications. In this instance, I would like the solve to pause when the mass flow rate drops below a certain point. We can do this by checking the “Pause” box and choosing an appropriate criteria to trigger the pause.

4 pause criteria

Once this is set up we can safely let the simulation run unattended, safely knowing when our pause criteria is met Flownex will interrupt the solve for us!

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