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STRANGE BUT REAL !!!!about the velocity at wall BCs |
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September 4, 2014, 22:54 |
STRANGE BUT REAL !!!!about the velocity at wall BCs
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#1 |
Senior Member
mohammad
Join Date: Dec 2010
Location: UK
Posts: 245
Rep Power: 16 |
Hello everyone,
I was trying to explore some simple thing. I created a simple duct, and then simple inlet outlet and walls. amazingly, when I extracted the nodal velocity values on all wall BCs using FILE>Export>.... , they are not zero.!!!! ( walls are no-slip, though) I extracted the velocity contours on the wall, they are zero. I shared this problem with my supervisor. and he told me that they values are being calculated on each cell centet point and then interpolated on the vertices... Is that correct??? Last edited by mohammad; September 5, 2014 at 05:30. |
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September 5, 2014, 04:59 |
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#2 |
New Member
Join Date: Aug 2014
Posts: 15
Rep Power: 12 |
Yes, the at the walls are represented by volumes and actual boundaries of these volumes away from walls. So you see velocity on the wall. If you want it zero, choose hybrid velocity instead of conservative in CFD Post. http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
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September 5, 2014, 06:41 |
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
Rep Power: 144 |
I think the FAQ you were trying to reference was this one: http://www.cfd-online.com/Wiki/Ansys...t_the_walls.3F
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