Wallmodel for differential stress model (CFX4

Jan Rusås

Dear All,

When using the standard k-epsilon then must Y+ for the cells at the wall be > 11, Otherwise it is possible to use the low Reynold models where y+ should be =1 or Y+=2..3 depending on model.

1) Is that also true when heat transfer is involved? As I recall from many years ago, the thermal boundary layer behave different from the turbulent boundary layer.

2) I have been told from CFX when using the differential stress model then should Y+>11. But I want to resolve the boundary layer meaning I want to calculate a case where I have y+ =< 1 and using the differential stress in ordrer resolve the non-isotropic behaviour in the boundary layer. (uu' NOT EQUAL TO vv' NOT EQUAL TO ww') in a boundary layer.

Is there any one out there that has made a correction to CFX, that can handle my problem ?

Regards Jan