wall function

mantec · July 25, 2012, 04:43

how to proceed with implementing wall function approach

Let’s say
I have calculated the Y+ and U+ values at the first node from the wall.
Assume Y+ < 5 therefore Y+ = U+

What is the next step.
Calculate the ‘u’ value from U+ which is u/ut where ut is the friction velocity and substitute the ‘u’ values for calculating the diffusive fluxes of the momentum equation or replace the old value ‘u’ with this new ‘u’ value calculated from U+. .

duri · July 27, 2012, 08:13

u need to be updated only from momentum equation. This equation is used to evaluate shear stress at the wall.

July 25, 2012, 04:43	wall function	#1
mantec New Member mantec Join Date: Jun 2012 Posts: 6 Rep Power: 13	how to proceed with implementing wall function approach Let’s say I have calculated the Y+ and U+ values at the first node from the wall. Assume Y+ < 5 therefore Y+ = U+ What is the next step. Calculate the ‘u’ value from U+ which is u/ut where ut is the friction velocity and substitute the ‘u’ values for calculating the diffusive fluxes of the momentum equation or replace the old value ‘u’ with this new ‘u’ value calculated from U+. .

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July 27, 2012, 08:13		#2
duri Senior Member duri Join Date: May 2010 Posts: 245 Rep Power: 16	u need to be updated only from momentum equation. This equation is used to evaluate shear stress at the wall.