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March 12, 2011, 20:30 |
No Slip Boundary Condition
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#1 |
Senior Member
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 255
Rep Power: 17 |
Dear All
I simulated a fluid flow in a pipe. When I considered the velocity vectors in CFD Post I found out that on the pipe wall axial velocity is not zero while I used no-slip boundary condition on the wall. Does anybody know why? Regards, AshtonJ |
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March 13, 2011, 06:52 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,844
Rep Power: 144 |
Look in the documentation for an explanation of hybrid and conservative variables. That is why the velocity at the wall appears to not be zero.
But rest assured that CFX is correctly applying the no slip boundary with zero velocity walls. |
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May 16, 2011, 22:47 |
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#3 |
Senior Member
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 255
Rep Power: 17 |
Hi
I want to plot axial velociy versus radius at the throat of a constricted pipe. I changed the axial velocity from conservative to hybrid variable however when I plot axial velocity, its boundary values are not zero. Do you know how I can plot the axial velocity with zero values on the boundaries. Regards, ashtonJ |
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May 17, 2011, 20:05 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,844
Rep Power: 144 |
Is the point at the boundary exactly on the boundary?
The hybrid values should have zero at the wall. If not then you have done something wrong. |
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May 17, 2011, 20:07 |
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#5 |
Senior Member
Ashkan Javadzadegan
Join Date: Sep 2010
Posts: 255
Rep Power: 17 |
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