How to use a solver repeatedly for design optimization

HoneyBadger · January 17, 2019, 08:49

Dear foamers,

I'm trying to do some design optimization work with openFOAM. But currently I couldn't find a way to get openFOAM solver automatically restart running with new set up.

Currently I am managing it with a bash script to repeatedly run the openfoam solver and read and rewrite the data into time 0 directory and run the solver again.

I tried to directly code into the solver of the optimization algorithm. But I could not find anyways to tell the runtime controller, say hi, go back to time 0 and loop again.

Is there anyone experienced with this?

Regards
Juntao

clapointe · January 17, 2019, 16:48

Yes, this is possible. Try using runTime.setTime. Setting it to zero would be something like :

Code:

runTime.setTime(0,(label)0)

.

Caelan

lebc · January 17, 2019, 20:25

You may want to try an optimization software or write a piece of code that controls the optimization flow.

I use Dakota, it's opensource, but you can also write your code. You can create a base case, for each case you want to run you copy this base case, modify the files you want and run OpenFOAM.

There is no need to run everything in the same case going back to time 0, just start a new case with a new parameter.

Hope it helps!

January 17, 2019, 08:49	How to use a solver repeatedly for design optimization	#1
HoneyBadger New Member Karl Yang Join Date: Jul 2016 Posts: 11 Rep Power: 10	Dear foamers, I'm trying to do some design optimization work with openFOAM. But currently I couldn't find a way to get openFOAM solver automatically restart running with new set up. Currently I am managing it with a bash script to repeatedly run the openfoam solver and read and rewrite the data into time 0 directory and run the solver again. I tried to directly code into the solver of the optimization algorithm. But I could not find anyways to tell the runtime controller, say hi, go back to time 0 and loop again. Is there anyone experienced with this? Regards Juntao

January 17, 2019, 16:48		#2
clapointe Senior Member Join Date: Aug 2015 Posts: 494 Rep Power: 15	Yes, this is possible. Try using runTime.setTime. Setting it to zero would be something like : Code: runTime.setTime(0,(label)0) . Caelan

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January 17, 2019, 20:25		#3
lebc Member Luis Eduardo Join Date: Jan 2011 Posts: 85 Rep Power: 15	You may want to try an optimization software or write a piece of code that controls the optimization flow. I use Dakota, it's opensource, but you can also write your code. You can create a base case, for each case you want to run you copy this base case, modify the files you want and run OpenFOAM. There is no need to run everything in the same case going back to time 0, just start a new case with a new parameter. Hope it helps!