no convergence at high pressure

October 22, 2007, 04:33

Hi,

I cannot reach the convergence criteria (1E-04) at 60 bar (SST, 2.2 million nodes, v=62 m/s, mesh quality nice). If I choose the pressure 1 bar, then I have a nice convergence after 100 steps. Please have somebody any idea how I can solve the problem? Thank you very much. Toralf

October 22, 2007, 06:59

Hi,

Does the higher pressure induce higher flow velocities? Is it compressible flow so therefore it chokes? Higher flow velocities or significant compressibility effects often will slow convergence.

Glenn Horrocks

October 22, 2007, 07:02

Check reference pressure that you are setting. For, good convergence, it should be near to the pressure at which CFD domain is at.

October 22, 2007, 04:33	no convergence at high pressure	#1
Toralf Guest Posts: n/a	Hi, I cannot reach the convergence criteria (1E-04) at 60 bar (SST, 2.2 million nodes, v=62 m/s, mesh quality nice). If I choose the pressure 1 bar, then I have a nice convergence after 100 steps. Please have somebody any idea how I can solve the problem? Thank you very much. Toralf

October 22, 2007, 06:59	Re: no convergence at high pressure	#2
Glenn Horrocks Guest Posts: n/a	Hi, Does the higher pressure induce higher flow velocities? Is it compressible flow so therefore it chokes? Higher flow velocities or significant compressibility effects often will slow convergence. Glenn Horrocks

October 22, 2007, 07:02	Re: no convergence at high pressure	#3
Chirag Guest Posts: n/a	Check reference pressure that you are setting. For, good convergence, it should be near to the pressure at which CFD domain is at.

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