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October 28, 2008, 07:53 |
Smagorinsky Dynamic Cosant in UDF
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#1 |
Guest
Posts: n/a
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Hi, i'm performing some tests on the LES module of Fluent with the turbulent channel flow.
I wrote an UDF to export my data in an external file but i can't find the Dynamic Constant in the variables. That is: C_U(c,t) is the x_velocity C_V(c,t) is the y_velocity C_W(c,t) is the w_velocity what is the command for the Dynamic Constant? If there is not such a command, do you know if the following one: C_MU_T(c,t) which is the turbulent viscosity, is also valid with the LES model? Thanks |
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June 17, 2009, 03:40 |
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#2 |
New Member
Slawomir
Join Date: May 2009
Posts: 8
Rep Power: 16 |
Hello,
If it is needed for postprocessing you can extract a dynamic constant Cd by Cd = mu_t/(rho*SQR(delta)*S); where mu_t=C_MU_T(c,t); rho=C_R(c,t); delta=pow(C_VOLUME(c,t),0.333); S=Strainrate_Mag(c,t); |
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