How do I create an effective inflation layer in order to resolve the boundary layer?

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 July 13, 2019, 10:29 How do I create an effective inflation layer in order to resolve the boundary layer? #1 New Member   Join Date: Jul 2019 Posts: 27 Rep Power: 5 Hello, I am working on improving my meshing abilities and I came across the inflation feature that allows you to resolve the viscous sublayers close to the wall. I have confusion when it comes to determining the most suitable cell height. I utilize the following equations: Re = (rho*U*L) / mu y = ((y+)*mu) / U_tau*rho U_tau = sqrt(tau_w / rho) tau_w = 0.5*C_f*rho*U^2 where: U_tau is dimensionless velocity at the wall tau_w is the wall shear stress C_f is a friction coefficient Would I use these equations to determine y which would allow me to choose a suitable first wall height? How can I find C_f? Thank you.

 July 13, 2019, 10:59 #2 Senior Member   Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,291 Rep Power: 67 Yes, using the characteristic lenght L you can also write directly y/L =y+/Re

 Tags boundary layer, boundary layer control