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July 18, 2013, 05:48 |
turbulent dissipation rate of e B.C.
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#1 |
Member
CC
Join Date: Jun 2011
Posts: 73
Rep Power: 14 |
Hi all,
I'm trying implement a low-Re turbulence model using an UDF in Fluent. I know that I can turn on the low-Re turbulence model in Fluent, but the main objective is modify one of the models by changing the damping functions. The model that i'm using have a boundary condition for epsilon as: \epsilon_wall=dynamicviscosity*∂^{2}k/∂^{2}y (expression in attached file) but there is no command for the second derivative of k. Anyone can help me... How can I implement this boundary condition in a UDF? |
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July 18, 2013, 12:27 |
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#2 |
Member
CC
Join Date: Jun 2011
Posts: 73
Rep Power: 14 |
Another question: what is the better way to change the boundary condition at wall for epsilon (expression as a function of second derivative of k)? It is going to Boundary Conditions->Wall.1->Edit->UDS Boundary condition and in User-Defined Scalar Boundary Value changhe for the variable name defined in the UDF?
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