CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Single vs multi-block structured meshes

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

LinkBack Thread Tools Display Modes
Old   August 17, 2009, 12:43
Default Single vs multi-block structured meshes
New Member
Join Date: Aug 2009
Posts: 4
Rep Power: 10
ntonkin is on a distinguished road

I'm learning Fluent by going through the manual and can't figure out exactly what the differences are between multi-block structured meshes and single-block meshes. How do I know when to use what? What are the advantages and disadvantages of both? Thanks for any help.
ntonkin is offline   Reply With Quote

Old   August 20, 2009, 15:21
Senior Member
Join Date: Mar 2009
Posts: 189
Rep Power: 10
harishg is on a distinguished road
Check the book on grid generation by Thompson, available online.
harishg is offline   Reply With Quote

Old   August 22, 2009, 10:42
Senior Member
John Chawner
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 263
Rep Power: 11
jchawner is on a distinguished road

First recognize that we're talking about structured grids where the 3D spatial domain of interest in XYZ coordinates is transformed into a rectangular computational domain of xi-eta-zeta coordinates. In other words, there's a mapping between an arbitrarily shaped spatial region and a parallelepiped (block) in computational space. That mapping may be very difficult or even impossible to achieve for complex shapes. Therefore, the multi-block strategy is used to first decompose the spatial domain of interest into more than one regions, each of which can be more easily mapped into an independent computational block. Just as the blocks are adjacent in physical space, they are also adjacent (connected) in computational space. However, the overall agglomeration of computational blocks may not be rectangular (i.e. they might be L-shaped or even more complex).

Sometimes there are practical reasons for using a multiblock strategy as when you have different materials or fluids that are easily identified by putting them in their own block, boundary condition assignment, or any of several other reasons including something as mundane as the requirements of your flow solver.

Hope this helps.
John Chawner / /
on Twitter: @jchawner
jchawner is offline   Reply With Quote

Old   October 28, 2009, 16:51
New Member
Fariborz Soroush
Join Date: Oct 2009
Location: Tehran, Iran
Posts: 14
Rep Power: 10
faudiS8 is on a distinguished road
I'm student and try to learn grid generation for my course of CFD. but a question today made me confused.I thought that if i want to grid the area around an airfoil I've to make a domain made by a half circle around it and a rectangle in the continue to see the back effects.[I think it would better to know you that I work with gambit].and then make a multiblock domain consist of a half circle with deleted airfoil in it and one or two rectangle at the back so we can see a grid of C type,isn't it?
but today my friend who works with gambit from 1 year ago told me that he can make a single block domain with high quality grid. this made me
does he define a special type of points (corner,side,etc)in the domain at the vertices in the domain?
thanks for your guide.
faudiS8 is offline   Reply With Quote


Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Icem Mesh to Foam jphandrigan OpenFOAM Mesh Utilities 4 March 9, 2010 03:58
Block Structured Grid aurel Siemens 0 October 21, 2005 09:19
Block Structured Grid aurel NUMECA 0 October 21, 2005 09:17
Block Structured Grid aurel CFX 0 October 21, 2005 09:11
Block Structured Grid aurel Main CFD Forum 0 October 21, 2005 06:46

All times are GMT -4. The time now is 08:43.