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-   -   How to form a constant profile in the empty domain (http://www.cfd-online.com/Forums/fluent/42095-how-form-constant-profile-empty-domain.html)

justin August 22, 2006 16:36

How to form a constant profile in the empty domain
 
Hello,

That is an old question, but nobody answered it(or I can't get the answer).

According to the reference on neutral atmospheric boundary layer, the inlet boundary is defined as velosity U(z)=u*ln(z/z0)/k, K=u*^2/SQRT(Cu),Epsilon(z)=u*^3/k*z, outlet is set as outflow.sides and top as symmetry. the data was got from the previous wind tunnel test.

Realisable k-eps,two layer wall funciton,smooth wall, structured mesh and second order were used in the empty domain. After convergence, there was a large difference between inlet profile and outlet profile. Then grid was refined, but the problem still existed.

What is the reason of it? How can I achieve the consant profile in the empty domain?

Thanks

Justin


justin August 23, 2006 08:43

Re: How to form a constant profile in the empty do
 
Do I need to use cyclic condition between inlet and oulet?


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