CFX Command Language to Modify Expressions

cfd seeker · February 4, 2019, 06:31

Hello everybody,

i have to use some complex expressions to specify the displacement of Moving Walls in my simulation. The displacements are large so i also have to use Remeshing during the simulation. I want to modify the expressions little bit after every Remeshing.

As an example (this is just an example expression, my displacement expressions are very complex):

At the start of simulation the expression is:

Code:

displacement = 1[m/s]*t

Now if first remeshing is occuring at t=0.003[s], then the expression should like this after 1st Remeshing:

Code:

 
 displacement = 1[m/s]*(t+0.003[s])

If second Remeshing is occuring at t=0.006[s], then the expression should look like this after 2nd Remeshing:

Code:

 
displacement =1[m/s]*(t+0.006[s])

I know CFX Command Language uses Power Syntax (Perl language) to modify the CFX setup and automise the CFD Post, but i am not sure about the expressions. Can i modify the expressions using CCL with the help of if and elseif conditions? Is it possible?

ghorrocks · February 4, 2019, 16:18

No, I don't think you can use perl in CCL for the solver. But to be sure, why not just try it with a simple example and see if it works?

cfd seeker · February 5, 2019, 03:20

I already tried that but CFX is giving following error.

ccl_error.jpg

ghorrocks · February 5, 2019, 04:26

That error has nothing to do with perl in the CCL. That error is saying that the parallel mode you have asked for is not available. Either fix your setup so that mode is available or choose another parallel mode. Even better, for debugging you could use serial mode to make things as simple as possible. Only go to parallel when you need the additional computing power.

cfd seeker · February 6, 2019, 03:16

I know but this occurs only when i include CCL in the run. I have tried both Serial and Parallel before the last post but it gives the error even with Serial solver. When i don't include CCL file, then this error is not there.

ghorrocks · February 6, 2019, 16:23

Please post on the forum the CCL you are trying to use.

February 4, 2019, 06:31	CFX Command Language to Modify Expressions	#1
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	Hello everybody, i have to use some complex expressions to specify the displacement of Moving Walls in my simulation. The displacements are large so i also have to use Remeshing during the simulation. I want to modify the expressions little bit after every Remeshing. As an example (this is just an example expression, my displacement expressions are very complex): At the start of simulation the expression is: Code: displacement = 1[m/s]t Now if first remeshing is occuring at t=0.003[s], then the expression should like this after 1st Remeshing: Code: displacement = 1[m/s](t+0.003[s]) If second Remeshing is occuring at t=0.006[s], then the expression should look like this after 2nd Remeshing: Code: displacement =1[m/s]*(t+0.006[s]) I know CFX Command Language uses Power Syntax (Perl language) to modify the CFX setup and automise the CFD Post, but i am not sure about the expressions. Can i modify the expressions using CCL with the help of if and elseif conditions? Is it possible?

February 4, 2019, 16:18		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	No, I don't think you can use perl in CCL for the solver. But to be sure, why not just try it with a simple example and see if it works? __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

February 5, 2019, 04:26		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	That error has nothing to do with perl in the CCL. That error is saying that the parallel mode you have asked for is not available. Either fix your setup so that mode is available or choose another parallel mode. Even better, for debugging you could use serial mode to make things as simple as possible. Only go to parallel when you need the additional computing power. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

February 6, 2019, 16:23		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Please post on the forum the CCL you are trying to use. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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February 5, 2019, 03:20		#3
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	I already tried that but CFX is giving following error. ccl_error.jpg

February 6, 2019, 03:16		#5
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	I know but this occurs only when i include CCL in the run. I have tried both Serial and Parallel before the last post but it gives the error even with Serial solver. When i don't include CCL file, then this error is not there.