SST K-Omega boundary conditions and mesh properties

[dmitry]

Hi!
I met some confusion in defining SST K-Omega boundary conditions.

1) As I understand Reichardt's wall law is used to define velosity in boundary layer. Boundary Layer Thickness is so called "Y+" non-dimentional boundary layer, isn't it?
2) May I use following reference
http://www.cfd-online.com/Wiki/Turbulen ... conditions
to define inlet BC?
3) May I hope that I will obtain convergence using SST K-Omega solver with velosity = 1...2 m/s and inlet-outlet pressure drop = 100000 Pa?
4) I found that special mesh spacing for boundary layer is demanded. So trere is special calculator to choose grid spacing
http://www.pointwise.com/yplus/
is it important for BC definition?

Best regards!
Dmitry

[kishpishar]

Hi Dmitry,

Regarding your first question, I think Boundary Layer Thickness is not the Y+ (non-dimensional) thickness, but the actual physical thickness. At the end of the second chapter of the ModelsManual it says - this is the distance from the boundary node of the meshed domain to the physical wall. This can be normally calculated using the formula for the flow over a simple flat plate.

Jay

[dmitry]

Jay! Thank you very much!