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Forum: OpenFOAM Running, Solving & CFD

May 23, 2005, 11:40

Replies: 10

BCbs for high Renumbers

Views: 1,785

Posted By henry

Yes the BC for U does coincide

Yes the BC for U does coincide with the wall and that is why it is the physical BC of no-slip. I cannot see the point of moving the mesh around to correspond to a particular y+ particularly for...

Forum: OpenFOAM Running, Solving & CFD

May 23, 2005, 10:51

Replies: 10

BCbs for high Renumbers

Views: 1,785

Posted By henry

I do not agree with your asses

I do not agree with your assessment of the need for a slip BC for U, in fact I think this is wrong because it's a non-slip wall thus U should have a zero value. No one has found anything wrong with...

Forum: OpenFOAM Running, Solving & CFD

May 23, 2005, 03:39

Replies: 10

BCbs for high Renumbers

Views: 1,785

Posted By henry

Why do you think the BC for U

Why do you think the BC for U should be slip when using wall-functions? The OpenFOAM implementtation of wall-functions requires the U BC to be no-slip with zero-gradient on p, k and epsilon.

Forum: OpenFOAM Running, Solving & CFD

April 20, 2005, 06:09

Replies: 10

BCbs for high Renumbers

Views: 1,785

Posted By henry

You should use zeroGradient fo

You should use zeroGradient for k and epsilon at walls when using wall-functions.

Yes wall-functions are valid for high-Re flows.

Forum: OpenFOAM Running, Solving & CFD

April 20, 2005, 05:55

Replies: 10

BCbs for high Renumbers

Views: 1,785

Posted By henry

You should use zeroGradient fo

You should use zeroGradient for k and epsilon at walls when using wall-functions.

It is best to use wall-functions when there is no choice, i.e. when you cannot afford the resolution required...

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