Stop calculation when liquid_fraction=0 in a line

jpina · May 10, 2016, 16:24

Dear all,

I have a profile file where I have programmed a batch of simulations.

My interest is to jump from one simulation to the next instead not when the simulation reaches a number of time steps or a given time but when a control-line of my simulation is a solid (i.e., when liquid_fraction=0). How could I do this?

I will appreciate your help

LuckyTran · May 11, 2016, 01:41

There were some old articles in the Fluent customer support portal on how to do this, but it would be hard to dig them up.

The workaround is to setup a scheme that will evaluate whether your convergence condition is true and if it is true, to evaluate a command that will exit the simulation (wcd y exit).

Setup the Executing Commands During the Calculation option.

You would need to create a monitor for your criteria (surface integral or whatever). And then utilize an (rpgetvar 'var_name) to check if it has been satisfied. Then the execute would be something like:

(if (expression that evaluates to true) (exit) () )

For example the following:
(if (positive? 1) (exit) () )

will exit if 1 is positive or output () if 1 is not positive. Of course you also need to make sure you do a wcd first so that you don't get warnings that will mess up this sequence. Just spam the execute command several times or make a really complicated one.

You just need to get creative with your rpgetvar and monitor so that you can easily access it through a scheme command. Sorry I don't remember how to do this part off the top of my head.

May 10, 2016, 16:24	Stop calculation when liquid_fraction=0 in a line	#1
jpina Senior Member Jordi Pina Join Date: Mar 2015 Posts: 157 Rep Power: 12	Dear all, I have a profile file where I have programmed a batch of simulations. My interest is to jump from one simulation to the next instead not when the simulation reaches a number of time steps or a given time but when a control-line of my simulation is a solid (i.e., when liquid_fraction=0). How could I do this? I will appreciate your help

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May 11, 2016, 01:41		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,836 Rep Power: 68	There were some old articles in the Fluent customer support portal on how to do this, but it would be hard to dig them up. The workaround is to setup a scheme that will evaluate whether your convergence condition is true and if it is true, to evaluate a command that will exit the simulation (wcd y exit). Setup the Executing Commands During the Calculation option. You would need to create a monitor for your criteria (surface integral or whatever). And then utilize an (rpgetvar 'var_name) to check if it has been satisfied. Then the execute would be something like: (if (expression that evaluates to true) (exit) () ) For example the following: (if (positive? 1) (exit) () ) will exit if 1 is positive or output () if 1 is not positive. Of course you also need to make sure you do a wcd first so that you don't get warnings that will mess up this sequence. Just spam the execute command several times or make a really complicated one. You just need to get creative with your rpgetvar and monitor so that you can easily access it through a scheme command. Sorry I don't remember how to do this part off the top of my head.