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HiFiLES / HiFiLES-solver

High Fidelity Large Eddy Simulation Solver
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Non-dimensionalization for SA model equation. #88

Closed zhan1457 closed 9 years ago

zhan1457 commented 9 years ago

Hi,

I found the code is nondimensionalized except for SA model's source term. Since you use the non-dimensional velocity to help solve the nu_tilde, does it also need to be non-dimensional?

jewatkins commented 9 years ago

Hi Wanjia,

nu_tilde is non-dimensionalized by the reference velocity and length. The equation solves for non-dimensional nu_tilde so if you want to know what dimensional nu_tilde is, you need to multiple by uvw_ref and L_ref.

Some of the source terms for the non-dimensional form of the equation for the SA model should include a reference Reynolds number. The non-dimensionalization of the velocity is based on a reference Reynolds number of 1 so it's not necessary to include them. Let me know if you have any more questions.

-Jerry

zhan1457 commented 9 years ago

Thank you for your quick reply. I was misled by a paper that uses kinetic viscosity to do the non-dimensionalization.