how many points to resolve a boundary layer?

January 28, 2003, 12:37

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

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

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

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

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

http://geolab.larc.nasa.gov/APPS/YPlus/

January 30, 2003, 12:04

Thanks, I'll search for that.

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	http://geolab.larc.nasa.gov/APPS/YPlus/

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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to set boundary layer of a moving body in GAMBIT to a mesh zone for dynamic mesh	tomyangbath	FLUENT	18	October 12, 2016 07:57
Domain Imbalance	HMR	CFX	5	October 10, 2016 06:57
A question on "Specifying Boundary Layer Deformation Smoothing"	didiean	FLUENT	2	January 16, 2012 22:39
Boundary Layer Question	scottneh	STAR-CCM+	3	September 30, 2010 15:21
Boundary Layer Meshing of a nosecone	Chris	FLUENT	1	March 15, 2005 13:42