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-   -   Wall Function Approach - log law (http://www.cfd-online.com/Forums/cfx/21382-wall-function-approach-log-law.html)

Paul June 27, 2005 14:54

Wall Function Approach - log law
 
Hi Everyone,

I have been trying to understand the mechanics of the wall function approach used by CFX.

I've calculated y+ and u+ for a selection of points next to a wall. I expected the plot (y+ versus u+) to show a straight line as defined by the log law (y+ > 11.06). Instead there is a fair bit of scatter around the line.

Is there anything obvious I'm missing?

For reference: y+ = [delta y * (shear stress / density)^0.5] / kinematic viscosity u+ = velocity / (shear stress / density)

Any help much appreciated

Paul

dd.nvs June 30, 2005 03:03

Re: Wall Function Approach - log law
 
With CFX4, Tascflow or CFX5 ?

Paul June 30, 2005 07:06

Re: Wall Function Approach - log law
 
I'm using CFX 5.7

Paul


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