CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CD-adapco (http://www.cfd-online.com/Forums/cd-adapco/)
-   -   Convergence problems (http://www.cfd-online.com/Forums/cd-adapco/54674-convergence-problems.html)

Simone June 29, 2005 03:07

Convergence problems
 
I'm currently experiencing some problems in reaching the convergence in STAR-CD calculations. I have already tryed to reduce the mesh size and/or to change the boundary conditions to help reducing the residual values, but after some iterations, they always start obscillating between 10^-1 and 10^-2.

Is there any trick I can use to solve this problem?

Thanks a lot.

Simone

4xF June 29, 2005 06:50

Re: Convergence problems
 
Is your problem really steady-state?

Simone June 29, 2005 07:27

Re: Convergence problems
 
Yes! It is a really steady-state problem!

Can you help me, please?

Simone

4xF June 29, 2005 09:10

Re: Convergence problems
 
To me it looks like your problem may be a REAL transient and you try to enforce a steady-state solution. That may be the reason why you cannot get a converged solution, because the flow physics may be wrong.

Simone June 29, 2005 10:03

Re: Convergence problems
 
It's possible! How can I have a transient solution?

4xF June 29, 2005 10:48

Re: Convergence problems
 
Change the analysis type from steady-state to transient?


All times are GMT -4. The time now is 23:42.