Script for running Multiple simulations starting from a single initial file

doki · July 11, 2017, 07:14

I am a rather new user of the software, trying to develop a script to perform multiple simulations starting from a previously converged solution to save time.
It is basically a parametric study, so there are a lot of cases to be run, and each case should start from the SAME converged solution.
There is a tutorial covering the case with multiple simulations whose parameters are read from file, but that does not help because I want to start from the previous solution, and not from the initial conditions. Therefore, any help would be very welcome.
Furthermore, I have created an input file for the required parameters, and wonder if it is possible to add or multiply any set value inside my solution with the values I read from file. I mean, say we are studying the wall temperatures as a parameter, and need to run different cases with temperatures around a basic value. So is it possible to read the percentage of temperature change from a file and multiply the currently set value to that using the script?

Fiedde1887 · July 12, 2017, 11:33

You can run that parametric studys in the new Version of star (12.04.). Otherwise you have a look at the optimate-tool. It is described in the Manual as i know.

doki · July 13, 2017, 05:53

Thank you for your response Fiedde1887! I did indeed take a look at manuals for optimate, and that seemed to be helping. But our license is not complete and I currently do not have access to the optimate tool. We do not have access to the latest version of the software as well. Therefore I was looking for a way to get it done using our current available tools. So any help regarding this would be appreciated.

Vincent_GDC · July 13, 2017, 07:32

My advice is to use JAVA script. The advantage is that it is much easier to modify the configurations with JAVA. Its not hard at all to set up one such script and it will save you lots of time. If you are not familiar with JAVA then I suggest you learn it because it is very helpful in STAR-CCM+

doki · July 14, 2017, 07:54

I have managed to develop a script for the application. The simulation for the first case runs smoothly, but the solver does not run for next cases. I have checked the script and it seems the initial solution is not stored in the file, and the solver uses the new solution instead, resulting in the problem.
I have tried different ways to store the initial simulation results into another name, and then use that to re-allocate the new simulation. But that does not seem to be working. So I need a way to keep the original simulation data somewhere and then re-use that at the start of each case.
Any ideas?
Thanks

July 11, 2017, 07:14	Script for running Multiple simulations starting from a single initial file	#1
doki Member Join Date: Apr 2009 Posts: 41 Rep Power: 17	I am a rather new user of the software, trying to develop a script to perform multiple simulations starting from a previously converged solution to save time. It is basically a parametric study, so there are a lot of cases to be run, and each case should start from the SAME converged solution. There is a tutorial covering the case with multiple simulations whose parameters are read from file, but that does not help because I want to start from the previous solution, and not from the initial conditions. Therefore, any help would be very welcome. Furthermore, I have created an input file for the required parameters, and wonder if it is possible to add or multiply any set value inside my solution with the values I read from file. I mean, say we are studying the wall temperatures as a parameter, and need to run different cases with temperatures around a basic value. So is it possible to read the percentage of temperature change from a file and multiply the currently set value to that using the script?

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July 12, 2017, 11:33		#2
Fiedde1887 Member Nils Hennig Join Date: Apr 2015 Posts: 44 Rep Power: 11	You can run that parametric studys in the new Version of star (12.04.). Otherwise you have a look at the optimate-tool. It is described in the Manual as i know.

July 13, 2017, 05:53		#3
doki Member Join Date: Apr 2009 Posts: 41 Rep Power: 17	Thank you for your response Fiedde1887! I did indeed take a look at manuals for optimate, and that seemed to be helping. But our license is not complete and I currently do not have access to the optimate tool. We do not have access to the latest version of the software as well. Therefore I was looking for a way to get it done using our current available tools. So any help regarding this would be appreciated.

July 13, 2017, 07:32		#4
Vincent_GDC New Member Vincent Join Date: Jul 2017 Posts: 9 Rep Power: 9	My advice is to use JAVA script. The advantage is that it is much easier to modify the configurations with JAVA. Its not hard at all to set up one such script and it will save you lots of time. If you are not familiar with JAVA then I suggest you learn it because it is very helpful in STAR-CCM+

July 14, 2017, 07:54		#5
doki Member Join Date: Apr 2009 Posts: 41 Rep Power: 17	I have managed to develop a script for the application. The simulation for the first case runs smoothly, but the solver does not run for next cases. I have checked the script and it seems the initial solution is not stored in the file, and the solver uses the new solution instead, resulting in the problem. I have tried different ways to store the initial simulation results into another name, and then use that to re-allocate the new simulation. But that does not seem to be working. So I need a way to keep the original simulation data somewhere and then re-use that at the start of each case. Any ideas? Thanks