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-   -   how many points to resolve a boundary layer? (http://www.cfd-online.com/Forums/main/5693-how-many-points-resolve-boundary-layer.html)

Jiaying Xu January 28, 2003 12:37

how many points to resolve a boundary layer?
 
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

Jiaying Xu January 28, 2003 12:43

Re: how many points to resolve a boundary layer?
 
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

Volker January 28, 2003 13:09

Re: how many points to resolve a boundary layer?
 
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

mukhopadhyay January 28, 2003 23:08

Re: how many points to resolve a boundary layer?
 
heat transfer - so the thermal boundary layer. while resolving the bl one should take care of the prandtl number - or not?

murat January 29, 2003 16:15

Re: how many points to resolve a boundary layer?
 
Please have a look at "numerical computation of Internal and external flows" by C. Hirsch. I think you will have a general idea.

Praveen January 30, 2003 00:29

Re: how many points to resolve a boundary layer?
 
http://geolab.larc.nasa.gov/APPS/YPlus/

Jiaying Xu January 30, 2003 12:04

Re: how many points to resolve a boundary layer?
 
Thanks, I'll search for that.


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