are wall and patch inherently different?

immortality · January 23, 2013, 05:14

if i set at a patch properties to be in this manner:U=U Of wall i want,T and p:zerogradiet then would this patch play the role of a wall?or other things should be included into account?
At which parts of comressible solvers or models i can find an answer for this query?
Thanks a lot.

asoltoon · January 24, 2013, 01:59

Hello Ehsan,

If you are not using turbulence model and you don't have static pressure in your problem and the walls are adiabatic, your boundary conditions are O.K. But in the case of turbulent flow, you should use wallfunctions for K, Epsilon, Reynolds stress tensor(R), nut, and set the boundary condition for nuTilda as zerogradient. If you have heat exchange between wall and fluid or the wall has fixed temperature, the T boundary conditions will be different.

Regards
Ali

January 23, 2013, 05:14	are wall and patch inherently different?	#1
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	if i set at a patch properties to be in this manner:U=U Of wall i want,T and p:zerogradiet then would this patch play the role of a wall?or other things should be included into account? At which parts of comressible solvers or models i can find an answer for this query? Thanks a lot. ali moeni likes this.

January 24, 2013, 01:59		#2
asoltoon Member Ali Khalifesoltani Join Date: Mar 2011 Location: Esfahan, Iran Posts: 56 Rep Power: 15	Hello Ehsan, If you are not using turbulence model and you don't have static pressure in your problem and the walls are adiabatic, your boundary conditions are O.K. But in the case of turbulent flow, you should use wallfunctions for K, Epsilon, Reynolds stress tensor(R), nut, and set the boundary condition for nuTilda as zerogradient. If you have heat exchange between wall and fluid or the wall has fixed temperature, the T boundary conditions will be different. Regards Ali immortality and ali moeni like this.

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