CONVERGENCE PROBLEM,HELP!!!!
 

Dear guys, I am having problem in convergence OF MASS.I have tried reducing uR etc. Let me give you a brief discription of the problem: My model is a big domain(50*12*8m^3) with a inlet header(dia=200mm having 200 holes) in it.The domain also consists of solid blocks in it. It is a conjugate heat transfe set up.The model does not show any error in check. I have specified inlet,outlet and wall B.C.

The flow is very less as compared to the size of domain.

Any previous experience with such type of problem??? TIA

Re: CONVERGENCE PROBLEM,HELP!!!!
 

In large problems I have done (>2 million cells) I need to use the AMG solver to get mass convergence.

Tom

Re: CONVERGENCE PROBLEM,HELP!!!!
 

Also, try to reduce time step and set the pressure correction relaxation factor to 0.8.

Re: CONVERGENCE PROBLEM,HELP!!!!
 

when i am giving AMG SOLVER,it is giving some error message and asking to contact ADAPCO. I DONT KNOW WHY???

tHANKS FOR THE RESPONSES.

Re: CONVERGENCE PROBLEM,HELP!!!!
 

The AMG sover is very sensitive to mesh errors. Use the check tool and check for connectivity, cracks, and centroid errors. Sometimes it works to restart from a run that was using the CG method.

Tom