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Old   April 3, 2008, 12:14
Default Free slip in CFX??
  #1
Vijay
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Dear friends,

What is meant by "Free slip" in cfx?? how it differs from "no slip" condition?? PLZ reply.. Thanks in advance..

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Old   April 3, 2008, 12:35
Default Re: Free slip in CFX??
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andy2O
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This is fundamental to fluid dynamics.... If this is not familiar to you I suggest you stop doing CFD work for a while and read a good book about viscous flow!

No slip -> Fluid velocity = 0 at stationary boundary. This is the usual condition for viscous flow at a wall.

Free slip -> Normal component of fluid velocity = 0 at stationary boundary. Tangential component of velocity can have any value.

The extension to moving boundaries is obvious: you consider velocity relative to the boundary and apply the rules above.

HTH,

Andy.
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Old   April 3, 2008, 14:12
Default Re: Free slip in CFX??
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J
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Hi,

normally a no-slip condition is used in viscous flow calculation. If u are simulating a non-viscous fluid (for example an Euler flow) at the boundary u have that the fluid velocity is not zero. Anyway also in case of viscous flow u can have a slip boundary condition, for example in rarefied flow (e.g. high altitudes...)...

ok?

cheers

J
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Old   April 7, 2008, 04:53
Default Re: Free slip in CFX??
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Vijay
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Thanks friends...
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Old   August 20, 2013, 23:34
Default free slip boundary condition for gas
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mohamad
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mohamad3564 is on a distinguished road
Hello

I study gas- liquid bubble column. and I use free slip boundary condition for gas base on previous study. I want to understand why I have to use this
boundary condition for gas.
Thank you.
mohamad3564 is offline   Reply With Quote

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