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Viscous Sublayer thickness

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Old   January 1, 2015, 02:05
Default Viscous Sublayer thickness
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Hi

Can anyone advise me how to determine viscous sublayer region thickness in my geometry. I am doing Fluid structure interaction for air flowing in pipes. Normally it is assumed if structural displacements are less than viscous sublayer region thickness, one way FSI is alright. I have used OpenFOAM to model LES with PISOFOAM. Kindly advise if there is any method in OpenFOAM or manual calculation that I can use.

Also, please advise if it is possible to determine viscous sublayer region thickness along the whole length of the geometry i.e., if my pipe is 5m long, I would like to have displacements at each meter.

Regards
Imad Haqqi

Last edited by sihaqqi; January 1, 2015 at 02:08. Reason: better structure
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Old   January 1, 2015, 14:34
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Get your y+ using yPlus, go to paraview and see how far is your first cell from the boundary, with that you can obtain the relationship between the yPlus and y, so you only need to multiply the y * 5 to get your viscous sublayer if I remember correctly
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Old   January 1, 2015, 17:16
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Many thanks for sparing time to answer this question. I used yplus calculator to calculate first cell distance from the wall. So this means I only need to multiply that cell distance with 5. Correct?

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