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March 4, 2013, 12:11 |
Wall damping function
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#1 |
Senior Member
Meimei Wang
Join Date: Jul 2012
Posts: 494
Rep Power: 15 |
Hi,
What is the wall damping function? Is that just a boundary layer model to reduce the grids number near the wall? Why it's called 'damping function'? Thanks.
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Best regards, Meimei |
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March 4, 2013, 19:00 |
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#2 |
Senior Member
ATM
Join Date: May 2009
Location: United States
Posts: 104
Rep Power: 16 |
A wall damping function, atleast in LES/RANS, is used to reduce the turbulent viscosity near the wall region of the body. This is because, physically the turbulent viscosity is 0 at the walls, and to avoid unphysical (high) values of turb viscosity in the boundary layer region close to the wall, the damping is a mathematical function used to progressively reduce the its value to zero at the wall.
as always, you can google this. Its a very famous technique, and there's no dearth of info |
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