Wall damping function

Anna Tian · March 4, 2013, 12:11

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.

atmcfd · March 4, 2013, 19:00

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

March 4, 2013, 12:11	Wall damping function	#1
Anna Tian Senior Member Shoushou Tian Join Date: Jul 2012 Posts: 193 Rep Power: 2	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. __________________ Best regards, Shoushou

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March 4, 2013, 19:00		#2
atmcfd Senior Member ATM Join Date: May 2009 Location: United States Posts: 104 Rep Power: 5	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