Coupling between CFX and Matlab

Skymaas · April 13, 2020, 05:56

Hi!

Is there a way to couple CFX and Matlab?
I have an optimization problem where I would like to perform all flow simulations in CFX and run the optimization through Matlab. I intend to use Matlab as the "Master" and CFX as a "Slave" - if that makes sense.

Thank you!

ghorrocks · April 13, 2020, 06:50

What level do you want to do the coupling?

If you want CFX to do the simulations, output a result and matlab processes the result, and generates a modified input file which is passed back to CFX: This type of coupling is straight forward and can be done using the command line interface. You drive CFX-Pre and CFX solver from the command line from Matlab, and it runs inside a matlab script.

If you want matlab to couple into the simulation running in CFX then things are MUCH harder. I hope you don't want to do this.

Skymaas · April 13, 2020, 20:13

Hi Glenn, thank you for the answer!

Yeah, basically as you write:
Run the simulation in CFX --> Extract the result and put into Matlab --> Generate a new input file --> Put into CFX --> Run again.

And the loop then continues, until an or several optimum points have been generated/found. The idea is to use a genetic algorithm in Matlab.
Do you have an example of something remotely related to this? This is my first time using the command line interface.

ghorrocks · April 13, 2020, 20:58

The command line interface of CFX is described in the documentation. Or you can just fire up a command line and ask for help. The commands are cfx5solve and cfx5pre, and they both have a -help option.

April 13, 2020, 05:56	Coupling between CFX and Matlab	#1
Skymaas New Member Martin Rønnov Andersen Join Date: Oct 2018 Location: Aalborg, Denmark Posts: 10 Rep Power: 8	Hi! Is there a way to couple CFX and Matlab? I have an optimization problem where I would like to perform all flow simulations in CFX and run the optimization through Matlab. I intend to use Matlab as the "Master" and CFX as a "Slave" - if that makes sense. Thank you!

April 13, 2020, 06:50		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	What level do you want to do the coupling? If you want CFX to do the simulations, output a result and matlab processes the result, and generates a modified input file which is passed back to CFX: This type of coupling is straight forward and can be done using the command line interface. You drive CFX-Pre and CFX solver from the command line from Matlab, and it runs inside a matlab script. If you want matlab to couple into the simulation running in CFX then things are MUCH harder. I hope you don't want to do this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

April 13, 2020, 20:58		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	The command line interface of CFX is described in the documentation. Or you can just fire up a command line and ask for help. The commands are cfx5solve and cfx5pre, and they both have a -help option. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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April 13, 2020, 20:13		#3
Skymaas New Member Martin Rønnov Andersen Join Date: Oct 2018 Location: Aalborg, Denmark Posts: 10 Rep Power: 8	Hi Glenn, thank you for the answer! Yeah, basically as you write: Run the simulation in CFX --> Extract the result and put into Matlab --> Generate a new input file --> Put into CFX --> Run again. And the loop then continues, until an or several optimum points have been generated/found. The idea is to use a genetic algorithm in Matlab. Do you have an example of something remotely related to this? This is my first time using the command line interface.