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Old   March 4, 2003, 07:16
Default high-Re-turbulence-model
  #1
Stefan
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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
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Old   March 5, 2003, 05:23
Default Re: high-Re-turbulence-model
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Marc
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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
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Old   March 25, 2003, 03:40
Default Re: high-Re-turbulence-model
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Bo Jensen
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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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