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Help please:Inlet Boundary Conditions!!!

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Old   October 30, 2002, 22:22
Default Help please:Inlet Boundary Conditions!!!
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David
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Hi CFX users,

I want to specify pressure and mass flow rate at the same time on inlet of a pipe. Is it possible? For example, 15atm and 1.6e-004kg s^-1. Thanks in advance.

David
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Old   October 31, 2002, 03:51
Default Re: Help please:Inlet Boundary Conditions!!!
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Fabian
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Are you simulating compressible or incompressible flow? In incompressible the absolute value of pressure is of no relevance as only pressure-gradients appear in the equations.
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Old   October 31, 2002, 09:56
Default Re: Help please:Inlet Boundary Conditions!!!
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David
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Thanks, Fabian. I am simulating two-phase flow, one phase is gas and the other is liquid.
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Old   October 31, 2002, 11:30
Default Re: Help please:Inlet Boundary Conditions!!!
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Robin
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Hi David,

It is not possible to define both pressure AND mass flow at an inlet (unless it is a supersonic inlet, it which case it is necessary), nor does it make sense to do so. You will need to specify a pressure boundary condition elsewhere in your simulation (either another inlet, an outlet, or an opening). The pressure field will then be determined based on momentum and continuity.

Regards, Robin
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Old   October 31, 2002, 20:03
Default Re: Help please:Inlet Boundary Conditions!!!
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David
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Hello Robin

Thank you very much for your answer. Now I understand it.

Many regards David
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