Grid sensitivity analysis

darookie · August 24, 2009, 12:23

Hi,
I want to do a grid sensitivity analysis and i am not sure about the criteria to change the grid for each step. Should i just concentrate on the absolute number of cells or increase the volume of the cells, so I can keep the quality of my grid according to aspect ratio and angle.
In which way are you handling this topic?
Thanks for your replies
andrej

ghorrocks · August 24, 2009, 20:08

Refer to Roache's classic text "Computational Fluid Dynamics" for a complete analysis of this issue. A summary can be found in the Journal of Fluids Engineering editorial policy - http://journaltool.asme.org/Template...umAccuracy.pdf

darookie · August 25, 2009, 10:00

Thank you very much.
The link really perfectly describes the requirements for a good numerical study. But it is a little bit unspecific in describing the grid refinement.

the article only mentions: that the refinement should be structured, the use of geometrically similiar cells are preferable and the different grid resolutions should be significantly different.

Than it is rather prefered to choose different grids, which are proportionally to each other by volume

or something else? I search for the most common way!!
I haven t read the recommended book yet, but thanks for your advise, now i know that iam not on the wrong track.

August 24, 2009, 12:23	Grid sensitivity analysis	#1
darookie New Member Andrej Hoyningen Join Date: Jul 2009 Posts: 22 Rep Power: 17	Hi, I want to do a grid sensitivity analysis and i am not sure about the criteria to change the grid for each step. Should i just concentrate on the absolute number of cells or increase the volume of the cells, so I can keep the quality of my grid according to aspect ratio and angle. In which way are you handling this topic? Thanks for your replies andrej

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Sensitivity Analysis - Grids Not Asymptotic	Marc	FLUENT	2	November 8, 2017 07:35
What exactly is a sensitivity analysis?	Josh	CFX	3	August 19, 2009 10:18
grid sensitivity test	Joe	Main CFD Forum	1	January 10, 2007 09:08
Combustion Convergence problems	Art Stretton	Phoenics	5	April 2, 2002 06:59
Stability analysis on a non-uniform grid	PRAVEEN CHANDRASHEKAR	Main CFD Forum	7	July 2, 1999 02:46

August 24, 2009, 20:08		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	Refer to Roache's classic text "Computational Fluid Dynamics" for a complete analysis of this issue. A summary can be found in the Journal of Fluids Engineering editorial policy - http://journaltool.asme.org/Template...umAccuracy.pdf

August 25, 2009, 10:00		#3
darookie New Member Andrej Hoyningen Join Date: Jul 2009 Posts: 22 Rep Power: 17	Thank you very much. The link really perfectly describes the requirements for a good numerical study. But it is a little bit unspecific in describing the grid refinement. the article only mentions: that the refinement should be structured, the use of geometrically similiar cells are preferable and the different grid resolutions should be significantly different. Than it is rather prefered to choose different grids, which are proportionally to each other by volume or something else? I search for the most common way!! I haven t read the recommended book yet, but thanks for your advise, now i know that iam not on the wrong track.