change a variable in dissipation tem of turbulence model -- CFD Online Discussion Forums

March 28, 2014, 09:31	change dissipation rate of kinetic energy in k-w SST turbulence model	#1
behest Member Ali.E Join Date: Sep 2010 Location: Lisboa Posts: 83 Rep Power: 16	Hello all, I want to modify the dissipation rate of kinetic energy equation by UDF. Which macro can be used? Is it possible to use DEFINE_SOURCE for definning new dissipation rate? Actually, I must change the formulation of dissipation rate of k-equation and then, Fluent uses the modified dissipation term instead of itselfs. My turbulence model is k-w SST and I just manipulate Y_k (dissipation rate of k). Original: Y_k=robeta_skw; Modified: Y_k=robeta_skw/delta; (delta is wall distance) It would be appriciated if anyone makes a comment to how I do this task. Last edited by behest; March 31, 2014 at 13:24.

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