Possible to Access Cmu for the k-e realizable model in UDF

Brad_rawl · March 17, 2021, 02:18

Hi all;

I was wondering if it was possible to access the varaible Cmu for the k-e realizable model in a UDF.

I have read that M_keCmu should be accessable to all UDF, but when compiling I get this error:

error C2065: 'M_keCmu': undeclared identifier

Is there a header file that I am missing?

I intend to modify the turbulent viscosity, need access to the Cmu varaible.

I look forward to your responses.

Regards

AlexanderZ · March 18, 2021, 00:43

don't have experience with modifying turbulence model variables, but
M_keCmu is defined in turb_ke.h file infolder:
\ANSYS Inc\vxxx\fluent\fluentxx.x.x\src\turbulence

as far as I know, you don;t need anything else but default
#include "udf.h"
in the very begging of code, not sure, why it doesn't work

Brad_rawl · March 18, 2021, 01:52

Thank you
AlexanderZ

I figured out the issue, for fluent v19.5 (and I assume for later versions as well)
M_keCmu is replaced with GVAR_TURB(coeff, ke_Cmu).

March 17, 2021, 02:18	Possible to Access Cmu for the k-e realizable model in UDF	#1
Brad_rawl New Member Brad Join Date: Feb 2021 Posts: 3 Rep Power: 5	Hi all; I was wondering if it was possible to access the varaible Cmu for the k-e realizable model in a UDF. I have read that M_keCmu should be accessable to all UDF, but when compiling I get this error: error C2065: 'M_keCmu': undeclared identifier Is there a header file that I am missing? I intend to modify the turbulent viscosity, need access to the Cmu varaible. I look forward to your responses. Regards

March 18, 2021, 00:43		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	don't have experience with modifying turbulence model variables, but M_keCmu is defined in turb_ke.h file infolder: \ANSYS Inc\vxxx\fluent\fluentxx.x.x\src\turbulence as far as I know, you don;t need anything else but default #include "udf.h" in the very begging of code, not sure, why it doesn't work __________________ best regards ****************************** press LIKE if this message was helpful

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March 18, 2021, 01:52		#3
Brad_rawl New Member Brad Join Date: Feb 2021 Posts: 3 Rep Power: 5	Thank you AlexanderZ I figured out the issue, for fluent v19.5 (and I assume for later versions as well) M_keCmu is replaced with GVAR_TURB(coeff, ke_Cmu).