CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Grid adaption or Gambit meshing? (http://www.cfd-online.com/Forums/fluent/30560-grid-adaption-gambit-meshing.html)

ravi varma November 22, 2002 08:05

Grid adaption or Gambit meshing?
 
hi, i was wondering if grid adaption is suitable to refine your mesh geometry. or should one work in gambit and import into Fluent. Which is more reliable in terms of solutions and convergence? I want to increase no. of cells in my geometry upto 10 times. But, working in gambit with the mesh and importing into Fluent is time consuming. Is it worth doing this or is it reliable to use grid adaption in Fluent?

Amid Naz November 22, 2002 20:45

Re: Grid adaption or Gambit meshing?
 
I would say, exporting the mesh to fluent and refine it there is better. In fluent you can do adaption with different ways, by volume size and even by gradient which you can't do in gambit..

mahdi saniee nezhad November 24, 2002 01:44

Re: Grid adaption or Gambit meshing?
 
Dear sir I have a problem with this title. If it's possible for you please send me your received responses. Very thanks for your attention to my request. With the best regards. Mahdi saniee nezhad


heydari November 25, 2002 06:15

Re: Grid adaption or Gambit meshing?
 
Mr.Saniee Nezhad, I think you Are a student in Sharif uni. I am also using the fluent software, for my thesis. It would be so useful for both of us to be come more familiar with the projects and also beeing in contact to solve the problems and discusing the experiments. with great wishes for you.

mahdi saniee nezhad November 25, 2002 07:03

Re: Grid adaption or Gambit meshing?
 
Dear mr. heydari, i'm also happy to familiar with you, where are u studying and in which grade? i'm ready to have a discussion about your/and my problem. please give me a full detail of your problem in persian (MS Word file) and title of your project.

with the best regards mahdi saniee

madasu November 26, 2002 06:47

Re: Grid adaption or Gambit meshing?
 
Hi,

I would say, it is better to create a new grid (even though it is time consuming, unless you donot opt for accurate results) rather than refining the grid upto 10 times. Fluent can only handle reliable results upto certain level of grid refinement. This is what according to my experience.

regards

madasu

Alamgir December 3, 2002 00:19

Re: Grid adaption or Gambit meshing?
 
Yes, I also would say, go to gambit and remesh with smaller size, like increase the edge nodes and put boundary layer with smaller size. Or u can do it by rescale with aspect ratio increased in fluent.

Alamgir

Amid Naz December 5, 2002 22:51

Re: Grid adaption or Gambit meshing?
 
refinement within Fluent is saving time, because you are refining a mesh of a converged solution and can be done many times. To remesh in Gambit means a new case to be intialized and solved which is time consuming..This is according to my experience with complex geometry.. Good luck.

Detlef Schulze December 12, 2002 14:09

Re: Grid adaption or Gambit meshing?
 
1. using wall-adaption in fluent does not increase the resolution of the geometric wall surfaces, ie discretizing a sphere's surface by say 100 cells and applying a wall adaption gives you more cells on the surface BUT the new surface cells DO NOT resemble the shape of the actual sphere. Hence, if you need to adapt at solid surfaces I would rather suggest to generat a new grid in Gambit. 2. Having generated a new grid in Gambit you can always interpolate the solution from the previous "coarse" mesh onto the new mesh within Gambit


All times are GMT -4. The time now is 03:52.