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How to set BC of incompressible flow

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Old   February 5, 2002, 07:27
Default How to set BC of incompressible flow
  #1
zhwm
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I want to compute flowfield aroud a train,the speed of train is 200km/hour,iI have completed grid generation, but I don't konw how to set outer boundary condition properly,

who can help me?

thanks a lot.
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Old   February 5, 2002, 08:34
Default Re: How to set BC of incompressible flow
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Christian
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How about velocity inlet and pressure outlet ?

Christian
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Old   February 7, 2002, 00:57
Default Re: How to set BC of incompressible flow
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Jin-Wook LEE
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Of course velocity inlet is best one for the front of the train. And pressure inlet is very good one for far field.

Sincerely, Jinwook
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Old   February 7, 2002, 04:47
Default Re: How to set BC of incompressible flow
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zhwm
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thanks for yuor help here is an other problem. I use segregaed solver+laminar flow,why the surface of train have large non-zero velocities?
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Old   February 7, 2002, 11:38
Default Re: How to set BC of incompressible flow
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Erwin
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Be sure to turn 'Node Values' off when displaying velocity contours.
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Old   February 7, 2002, 22:44
Default Re: How to set BC of incompressible flow
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Jin-Wook LEE
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1. I think that the flow should be turbulent flow because the geometry and velocity are enough high(high Reynolds number) to ensure turbulent flow.

2. Of course, the surface of train is zero velocity(no slip condition). Velocity inlet and pressure inlet(or pressure outlet if you prefer) are for far field.

Sincerely, Jinwook

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