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

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Old   July 13, 2019, 10:29
Default How do I create an effective inflation layer in order to resolve the boundary layer?
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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.
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Old   July 13, 2019, 10:59
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Yes, using the characteristic lenght L you can also write directly



y/L =y+/Re
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