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Star-CCM+ uni-directional flow...

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Old   November 10, 2007, 22:07
Default Star-CCM+ uni-directional flow...
  #1
mk_mat
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hi guys,

I was wondering if it would be possible to define an one-directional flow in Star-CCM+?

suppose there is a boundary and I want to restrict the flow only in x-direction? in other words, gas/liquid can flow only in (+X) direction through this region not in (-X), (Y) or (Z) directions.

Is that possible to use or define a new Field-Function or use any user-code to do that, appreciate any help and feedback?

Thanks,
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Old   November 11, 2007, 08:21
Default Re: Star-CCM+ uni-directional flow...
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Harry
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Use porous media
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Old   November 11, 2007, 18:12
Default Re: Star-CCM+ uni-directional flow...
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mk_mat
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flow in porous media can be in either direction - I tried that!
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Old   November 12, 2007, 05:26
Default Re: Star-CCM+ uni-directional flow...
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mk_mat
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Let me correct my comment! I want to have flow in (+X) direction and not (-X) - what if I had back-flow!
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Old   November 12, 2007, 07:13
Default Re: Star-CCM+ uni-directional flow...
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Harry
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Is that physical?

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Old   November 12, 2007, 07:40
Default Re: Star-CCM+ uni-directional flow...
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mk_mat
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if that is a boundary, yes.

Say the gas should flow through this face only in +X and there should not be -X flow. I guess it is possible at Star-CD with some user-coding and want to know if that is possible at CCM+ as well.
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Old   November 12, 2007, 09:08
Default Re: Star-CCM+ uni-directional flow...
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Harry
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Why can't you just specify a fixed velocity boundary in the x direction
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Old   November 12, 2007, 09:15
Default Re: Star-CCM+ uni-directional flow...
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mk_mat
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suppose I have a geometry like this:

-> (N2) inlet--------------------------------->(N2) outlet

------------------ (boundary in between)-----------------

-> (CO) inlet--------------------------------->(CO) outlet

CO cannot pass through the boundary and go to the upper side (i.e. N2 side) but N2 can pass through the boundary to go to the lower side (i.e. CO side)!!!
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Old   November 12, 2007, 09:33
Default Re: Star-CCM+ uni-directional flow...
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Harry
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Ok I see what you mean now, it was a little tricky to visualise! porous baffle maybe? best ask your support people!
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