# Beginner

 Register Blogs Members List Search Today's Posts Mark Forums Read

 June 28, 2006, 05:58 Beginner #1 T.Rajkumar Guest   Posts: n/a Hello friends iam a beginner in CFD and Fluent. i have certain doubts.please help me. 1. I came to know that Hexahedral meshes give good result (accurate)than tetrahedral meshes.How this is justified. 2. what is physical importance of size functions in GAMBIT.

 June 29, 2006, 08:40 Re: Beginner #3 T.Rajkumar Guest   Posts: n/a Thank you Very much Mr. Amr Iam satisfied with the answer.Please answer for the following query also. 1. Physical significance of giving size functions. 2. what is Volume Decomposition.why it is done. Thank you. Raj.

 July 3, 2006, 19:48 Re: Beginner #4 Amr Guest   Posts: n/a Hi Raj, I would recommend that you check the gambit user guide in regards to your questions. As for the decomposition, volume decomposition is utilized in gambit so that you may have the optimum grid structure you look for. As you may know, gambit uses certain mathematical algorithms that produce the mesh automatically inside your geometry like map, submap, pave, cooper, T-grid schemes. Those shemes depend on certain geometric features and vertex types as detailed in the gambit user guide. Map scheme, for example, produces hex meshes. So, if you wished that all you geometry be meshed with that map scheme, you should make sure your geometry is map scheme compatible. One important way of doing this is by decomposing your geometry to "mapable parts" (i.e. partitioning your geometry) so that gambit could produce hex meshes with the map scheme. This philosophy applies to all other meshing schemes. For the size functions, yes the do have physical importance. They are used to vary the cell "grid" sizes within your domain. It enables you to build coarser grid where -in your domain- you expect weak changes in solution variables, and on other hand, build finer grid where you need to resolve strong changes in your solution variables. All the above is very well discussed in the gambit user guide. I hope this helps! Cheers, Amr

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post marymasod FLUENT 1 June 3, 2010 16:51 wlt_1985 FLUENT 4 November 3, 2009 23:16 sarajags_89 OpenFOAM 2 October 2, 2009 18:31 atmcfd Main CFD Forum 4 June 22, 2009 02:29 saravanan Main CFD Forum 3 August 16, 2003 07:38

All times are GMT -4. The time now is 08:41.