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outlet boundary

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Old   March 20, 2007, 07:07
Default outlet boundary
  #1
thomas
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Hello,

I am running scalar mixing of air and fuel inside a small tube. When I start the solver I get a message like:

Unless the flow is supersonic the outlet boundary is not well posed.

The flow is not supersonic at the outlet. I get M close to 0.7 near one of the inlets, but the outlet diametre is much larger.

Does anyone know what this could mean?

thanks,

Thomas
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Old   March 20, 2007, 08:38
Default Re: outlet boundary
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Richard
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An outlet boundary can be used for compressible flows only under limited circumstances. There's a section in chapter 6 of the user guide which explains these.
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Old   March 20, 2007, 09:10
Default Re: outlet boundary
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thomas
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thanks
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Old   March 20, 2007, 23:02
Default Re: outlet boundary
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Mac
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Hi, generally outlet boundaries are not used for compressible flows. This has been the rule for all solvers. Try using a different boundary condition, instead of 'outlet' boundary.
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