# how many points to resolve a boundary layer?

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 January 28, 2003, 12:37 how many points to resolve a boundary layer? #1 Jiaying Xu Guest   Posts: n/a 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

 January 28, 2003, 12:43 Re: how many points to resolve a boundary layer? #2 Jiaying Xu Guest   Posts: n/a 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

 January 28, 2003, 13:09 Re: how many points to resolve a boundary layer? #3 Volker Guest   Posts: n/a 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

 January 28, 2003, 23:08 Re: how many points to resolve a boundary layer? #4 mukhopadhyay Guest   Posts: n/a heat transfer - so the thermal boundary layer. while resolving the bl one should take care of the prandtl number - or not?

 January 29, 2003, 16:15 Re: how many points to resolve a boundary layer? #5 murat Guest   Posts: n/a Please have a look at "numerical computation of Internal and external flows" by C. Hirsch. I think you will have a general idea.

 January 30, 2003, 00:29 Re: how many points to resolve a boundary layer? #6 Praveen Guest   Posts: n/a

 January 30, 2003, 12:04 Re: how many points to resolve a boundary layer? #7 Jiaying Xu Guest   Posts: n/a Thanks, I'll search for that.

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