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how many points to resolve a boundary layer?

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Old   January 28, 2003, 12:37
Default how many points to resolve a boundary layer?
  #1
Jiaying Xu
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Does anybody know what is the minimal number of grid points to resolve a boundary layer? Is there any general method/rationale/experience to determine this?

Thanks,

Jiaying
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Old   January 28, 2003, 12:43
Default Re: how many points to resolve a boundary layer?
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Jiaying Xu
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Sorry, forgot to mention that I am going to use FVM with LRN k-e turbulence models.

The problem is three-dimensional, but I am asking how many points along the wall-normal direction needed to resolve a bounday layer, to calculate flow friction and heat transfer. Let's assume the geometry is not that complicate (say, a flat plate).

Thanks,

Jiaying
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Old   January 28, 2003, 13:09
Default Re: how many points to resolve a boundary layer?
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Volker
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Hi,

According to the Star manual it is recommended to use at least 20 boundary layers with a y+ value of app. 1 near the wall.

Regards,

Volker
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Old   January 28, 2003, 23:08
Default Re: how many points to resolve a boundary layer?
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mukhopadhyay
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heat transfer - so the thermal boundary layer. while resolving the bl one should take care of the prandtl number - or not?
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Old   January 29, 2003, 16:15
Default Re: how many points to resolve a boundary layer?
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murat
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Please have a look at "numerical computation of Internal and external flows" by C. Hirsch. I think you will have a general idea.
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Old   January 30, 2003, 00:29
Default Re: how many points to resolve a boundary layer?
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Praveen
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http://geolab.larc.nasa.gov/APPS/YPlus/
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Old   January 30, 2003, 12:04
Default Re: how many points to resolve a boundary layer?
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Jiaying Xu
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Thanks, I'll search for that.
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