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Stefan March 4, 2003 08:16

high-Re-turbulence-model
 
Hi,

does anyone know what happens when I use the high-Re turbulence model and my y+-values are below 30 in some areas ? Is it essential to change the mesh accordingly or are the wall functions simply applied up to y+ = 30 ?

Thanks in advance, Stefan

Marc March 5, 2003 06:23

Re: high-Re-turbulence-model
 
Hey Stefan!
The wall functions are applied to any wall cell. Depending on your y+ value the viscous sublayer is assumed too thin (y+ < 5) or too thick (y+ > 30), what has effect on the gradients normal to the wall.
Geetings Marc

Bo Jensen March 25, 2003 04:40

Re: high-Re-turbulence-model
 
Hallo Stefan

In the case of wall shear stress the wall shear stress calculated in a straight pipe is almost constant for y+ values between 20 and 200. Below 20 the wall shear stress increases dramatical.

Regards

Bo


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