Is there any example of UDF available regarding this formula for near wall correction

Shuvo_Chowdhury · September 3, 2022, 12:29

Hello. I have to add this near wall correction for modeling turbulence with RSM model.
I don't find any example of adding this with UDF.
Can you suggest me anything regarding this?
vrms
u∗
= C(y+)2, for y+ < 4

AlexanderZ · September 6, 2022, 03:22

probably you may use DEFINE_PROFILE to recalculate veolcity

look for c0 and t0 in ansys fluent customization manual to get cell/thread of cell adjusted to boundary

Shuvo_Chowdhury · September 9, 2022, 18:25

Hello. Thanks for your reply.

This velocity is wall normal fluctuation velocity.

How I can re calculate this and where to input this UDF ?

Please let me know. I am stuck at this problem for many days and can't progress.

Capture.JPG

The figure above is the equation that I need to implement.
C is a constant.
v_rms is the fluctuation velocity in wall normal direction.

( I thought this could be done as Reynolds vv source term, but not being able to write the UDF )

September 3, 2022, 12:29	Is there any example of UDF available regarding this formula for near wall correction	#1
Shuvo_Chowdhury New Member Shuvo Chowdhury Join Date: Jul 2022 Posts: 4 Rep Power: 4	Hello. I have to add this near wall correction for modeling turbulence with RSM model. I don't find any example of adding this with UDF. Can you suggest me anything regarding this? vrms u∗ = C(y+)2, for y+ < 4

September 6, 2022, 03:22		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	probably you may use DEFINE_PROFILE to recalculate veolcity look for c0 and t0 in ansys fluent customization manual to get cell/thread of cell adjusted to boundary Shuvo_Chowdhury likes this. __________________ best regards ****************************** press LIKE if this message was helpful

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September 9, 2022, 18:25		#3
Shuvo_Chowdhury New Member Shuvo Chowdhury Join Date: Jul 2022 Posts: 4 Rep Power: 4	Hello. Thanks for your reply. This velocity is wall normal fluctuation velocity. How I can re calculate this and where to input this UDF ? Please let me know. I am stuck at this problem for many days and can't progress. Capture.JPG The figure above is the equation that I need to implement. C is a constant. v_rms is the fluctuation velocity in wall normal direction. ( I thought this could be done as Reynolds vv source term, but not being able to write the UDF )