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 Sigit September 20, 2000 22:13

FEM discretisation for eps-equation

Does anyone know , how to make discretisation for eps-equation (in k-eps Turbulence Model) using FEM Standard Galerkin ?

Sigit

 sylvain September 26, 2000 03:18

Re: FEM discretisation for eps-equation

If the k equation is :

Dk/Dt = P_k - e + div(nu+nu_t/sigma_k)grad k

and the epilson equation is :

De/Dt = c_e1 P_k - c_e2 e^2/k + div(nu+nu_t/sigma_e)grad e

one can write the two equations in a similar form :

for k :

(D/Dt - div(nu+nu_t/sigma_k)grad + e/k ) k = P_k

for e :

(D/Dt - div(nu+nu_t/sigma_e)grad + c_e2 e/k ) e = c_e1 P_k e/k

they can be discretize the same way using the weak formulation and the galerkin decomposition.

Note that it is easier to considere the ration e/k constant by element in each term.

 Sigit September 26, 2000 23:19

Re: FEM discretisation for eps-equation

Hi...sylvain !! Thank you for your advice. It's really useful for me.

Sigit

 Jas October 26, 2000 11:49

Re: FEM discretisation for eps-equation

No comment...

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