Grid study

ah_eshtiaghi · April 29, 2009, 18:32

What parameters do you usually use to find if the solution is grid independent?

rikio · April 29, 2009, 22:16

Check the quantity differences on different mesh density. If very few exists, it is grid independent.

Ralf Schmidt · April 30, 2009, 03:57

Hi!

I think, normally, the overall mesh size is changed to check the effect on cell count.

BUT, in my opinion, it is much more important, to change the grid density on "important" areas.

That are areas in your domain, where
1.: you have interesting parameters, like a certain velocity or a (local or integral) heat transfer. Parameters, that are the aim of your study.
2.: high gradients of the flow quantities appear. Like having a big temperature difference or high velocities close to a wall

So: my suggestion is to change the grid density in particular in these areas for checking the grid independence.

Best wishes
Ralf

April 29, 2009, 18:32	Grid study	#1
ah_eshtiaghi New Member Amir Eshtiaghi Join Date: Apr 2009 Location: Massachusetts, USA Posts: 9 Rep Power: 17	What parameters do you usually use to find if the solution is grid independent?

April 30, 2009, 03:57		#3
Ralf Schmidt Member Ralf Schmidt Join Date: Mar 2009 Location: Austria Posts: 67 Rep Power: 17	Hi! I think, normally, the overall mesh size is changed to check the effect on cell count. BUT, in my opinion, it is much more important, to change the grid density on "important" areas. That are areas in your domain, where 1.: you have interesting parameters, like a certain velocity or a (local or integral) heat transfer. Parameters, that are the aim of your study. 2.: high gradients of the flow quantities appear. Like having a big temperature difference or high velocities close to a wall So: my suggestion is to change the grid density in particular in these areas for checking the grid independence. Best wishes Ralf __________________ CFD - nothing but Colourful Fluid Dynamics

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April 29, 2009, 22:16		#2
rikio Senior Member Rikio Join Date: Mar 2009 Location: SH, China Posts: 182 Blog Entries: 1 Rep Power: 17	Check the quantity differences on different mesh density. If very few exists, it is grid independent.