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Forum: Main CFD Forum

November 29, 2022, 18:30

Replies: 8

Good estimates for the friction velocity?

Views: 761

Posted By kinematic_presser

Sorry, this expression is wrong (obviously,...

Sorry, this expression is wrong (obviously, because the units are wrong.) The kinematic viscosity nu should not be in there on the right.. THe correct expression is

u_*(x)\approx \sqrt{0.027...

Forum: Main CFD Forum

November 27, 2022, 11:12

Replies: 8

Good estimates for the friction velocity?

Views: 761

Posted By kinematic_presser

How can we estimate du/dy from du+/dy+ without...

How can we estimate du/dy from du+/dy+ without knowing u* ?

Forum: Main CFD Forum

November 27, 2022, 08:31

Replies: 8

Good estimates for the friction velocity?

Views: 761

Posted By kinematic_presser

To answer my own question: A good estimate is...

To answer my own question: A good estimate is known. Based on Fluid Mechanics by Frank M White,

u_*(x)\approx\sqrt{ 0.027~\left(\frac{Ux}{\nu}\right)^{-1/7}\cdot \frac{1}{2}\nu U^2}

Which...

Forum: Main CFD Forum

November 27, 2022, 08:25

Replies: 8

Good estimates for the friction velocity?

Views: 761

Posted By kinematic_presser

But surely some decent estimate must be already...

But surely some decent estimate must be already known? My scenario is the standard flat-plate setup for boundary layer theory. How was the expression in the linked video obtained?

EDIT: Yes, known...

Forum: Main CFD Forum

November 27, 2022, 06:42

Replies: 8

Good estimates for the friction velocity?

Views: 761

Posted By kinematic_presser

Good estimates for the friction velocity?

Hello guys,
I am making a mesh for an airofoil and I need to figure out how close to the wall I am going to put the first grid point for suitability for LES. Of course the usual recommendation is...

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