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Forum: FLUENT

October 1, 2023, 09:02

Replies: 6

Compressbible flow in zigzag duct with high Ma vs Fanno theory

Views: 331

Posted By LoGaL

When there's separation (which is unsteady...

When there's separation (which is unsteady phenomenon) the steady solver has always difficulties in converging. Especially if laminar.

Nothing you can do about it. You need to go for unsteady...

Forum: FLUENT

October 1, 2023, 05:09

Replies: 6

Compressbible flow in zigzag duct with high Ma vs Fanno theory

Views: 331

Posted By LoGaL

Fanno theory is alwais right, but the point is...

Fanno theory is alwais right, but the point is that for complex geometry the position of the throat is not alwais trivial. Are you having separation after the bends in the tube?

Forum: FLUENT

September 30, 2023, 06:49

Replies: 6

Compressbible flow in zigzag duct with high Ma vs Fanno theory

Views: 331

Posted By LoGaL

Indeed if your outlet is your throat, forcing the...

Indeed if your outlet is your throat, forcing the pressure there to be 1atm is wrong. But in any case, P would be 1atm in the farfield (as you said), not exactly at the outlet of your pipeline.
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