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Old   October 19, 2002, 21:52
Default compressible flow in compressor
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rahmat
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Hi all

Does Flient.6 could make a model of flow through kompressor's impeller???

Rahmat
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Old   October 21, 2002, 01:33
Default Re: compressible flow in compressor
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rahul
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Fluent can model compressible flow through impeller. You have to activate ideal gas equation in materials panel. Use MRF model to model ratating flows.
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Old   October 21, 2002, 08:18
Default Re: compressible flow in compressor
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rahmat
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I have tried, but I don't know how to make it to be convergence? segregated or coupled I should choose?

May I ask you a question? What kind of boundary condition should I set? I want to make a characteristic curve of the compressor; Can I make a variation on pressure ratio at a constant rotation speed?

Rahmat
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Old   October 23, 2002, 13:13
Default Re: compressible flow in compressor
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rahul
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If you choose coupled solver, energy will be automatically be activated. For getting convergence, you have to lower under-relaxation parameters. use 0.3 on velocity, 0.2 for pressure & 0.8 for energy.

Another way to reach convergence criteria is to solve the problem treating incompressible. (use segregated solver). The flow field obtained in this manner will be treated as initial guess for subsequent compressible flow simulation.

Typically, mass flow BC should be used with compressible flow. If you didn't get convergence, try velocity inlet & pressure outlet.
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