CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   SIMPLE (http://www.cfd-online.com/Forums/main/5499-simple.html)

x.zhang December 4, 2002 03:01

SIMPLE
 
I am using SIMPLE algorithm on unstructured mesh and I am using collocated variables.

On the ourflow boundary, I tried a non-reflecting boundary condition. I set du/dn=0 and dv/dn=0 and dp'/dn=const. The out normal direction is the same as u component velocity. p' is the pressure correction. It never worked for me. I change the boundary condition of p' to p'=0, but it doesn't work either.

I have to set the normal velocity and no its gradient. I don't know for imcompressible flow, whether I can set a zero gradient boundary condition for velocity.

jack December 5, 2002 05:57

Re: SIMPLE
 
Yes. The zero gradient BC for u, v is OK. dp'/dn=0 does not work. In all the BCs, set p'=0.

Jack

Bob January 3, 2003 16:44

Re: SIMPLE
 
I think what u want to do is set p'=0 on one edge, such as outlet, that is enough. ur problemm is ur code i think, i have writen a code and use SIMPLE successfuly to simulation packed column multiple flow . do check ur code to see if u miss something (Pataker's book)


All times are GMT -4. The time now is 18:50.