convergence problem in the turbomachinery problem.

u k jha · September 7, 2010, 03:07

what are the issue for the convergence of a simulation. In my case I am solving a centrifugal fan problem. In which I am simulating the impeller as well as the volute. I imposed the boundary conditions at
1) inlet : total pressure (0 pa relative pressure)
2) Outlet : mass flow rate:
3) impeller : Rotating wall;
4) casing :stationary wall;
I am using the k- omega turbulence model for solving the turbulent quantities.
I set the convergence criteria as 10e-4 for the velocities and the turbulence quantities.
I am solving the momentum equations with High resolution scheme.
I got struck when the simulation is not conversing up to the 10e-4. but I want it must touch the criteria of the 10e-5.
Can anyone help me where may be the problem? Please suggest me. Thank you.

ghorrocks · September 7, 2010, 19:41

http://www.cfd-online.com/Wiki/Ansys...gence_criteria

September 7, 2010, 03:07	convergence problem in the turbomachinery problem.	#1
u k jha New Member uk jha Join Date: Apr 2009 Posts: 16 Rep Power: 17	what are the issue for the convergence of a simulation. In my case I am solving a centrifugal fan problem. In which I am simulating the impeller as well as the volute. I imposed the boundary conditions at 1) inlet : total pressure (0 pa relative pressure) 2) Outlet : mass flow rate: 3) impeller : Rotating wall; 4) casing :stationary wall; I am using the k- omega turbulence model for solving the turbulent quantities. I set the convergence criteria as 10e-4 for the velocities and the turbulence quantities. I am solving the momentum equations with High resolution scheme. I got struck when the simulation is not conversing up to the 10e-4. but I want it must touch the criteria of the 10e-5. Can anyone help me where may be the problem? Please suggest me. Thank you.

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September 7, 2010, 19:41		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	http://www.cfd-online.com/Wiki/Ansys...gence_criteria