CFD Online Logo CFD Online URL
Home > Forums > FLUENT

What are Structured grids in Fluent

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

LinkBack Thread Tools Display Modes
Old   December 29, 2004, 18:45
Default What are Structured grids in Fluent
Posts: n/a
Hi guys, I have another question, so bear with me?

What are the structured grid-types I can use in Fluent?

For face meshing, I can use Quad, and for Volume, I can use Hex, but what about the other elements like triangles?

Thanks -Riaan
  Reply With Quote

Old   December 30, 2004, 06:16
Default Re: What are Structured grids in Fluent
Prakash Verma
Posts: n/a
For simple geometries, quad/hex meshes can provide high-quality solutions with fewer cells than a comparable tri/tet mesh and for complex geometries, quad/hex meshes show no numerical advantage, and you can save meshing effort by using a tri/tet mesh.

  Reply With Quote

Old   December 31, 2004, 13:25
Default Re: What are Structured grids in Fluent
Posts: n/a
The only structured grid type is a mapped quad mesh. The tri-primitive and submap are also structured meshes for faces, but it's simply an algorithm they use that breaks the faces into quadrilaterals that can be meshed using a mapped scheme. I've heard the wedge-primitive meshing scheme described as either structured or unstructured (because it uses tri elements at the tip and then a mapped mesh out from that). A quad mesh is unstructured if you use a pave meshing scheme, and a tri mesh is always unstructured. A volume mesh is structured if all of the faces are structured and either a mapped or cooper meshing scheme is used for the volume(a cooper mesh is ONLY structured if ALL of the face meshes are structured!).

All of that is simply semantics though. Prakash was right on when he said that for complicated geometries an unstructured mesh is just as good. In fact, I've seen people create very poor meshes in the hope that the fact that it was structured would make up for the fact that the mesh was close to useless. They waste hours or days building the mesh, and then the results are no good because of the mesh. For simple geometries a quad mesh will use less elements and therefore save computation memory and time. It's a trade off deciding if it's worth your time to spend it meshing or or letting the computer do the computing. 9 times out of 10 I would say spend it computing though. Besides if it's a big mesh, you can do other things while the computer thinks!

Hope this helps, Jason
  Reply With Quote

Old   December 31, 2004, 14:21
Default Re: What are Structured grids in Fluent
Posts: n/a
Thanks for the help! The reason I am going structured is that I will be doing a parametric study of the delta wing and that I will have more control over the grid sizing and locations.

Right now my delta wing will have about 500k-600k cells, so thats a good start for a grid-dependance study.

Regards Riaan
  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
Abaqus - Fluent Coupling WITHOUT MPCCI s.mishra FLUENT 0 May 1, 2011 09:45
few quesions on ANSYS ICEMCFD and FLUENT Prakash.Paudel ANSYS 0 August 12, 2010 12:07
combining structured and unstructured grids Shane FLUENT 2 January 23, 2007 21:57
Export grids from FLUENT Monica FLUENT 4 August 7, 2002 14:44
Single Phase Swirling Flow Modelling with Structured and Unstructured Fluent Daniel J. Suasnabar FLUENT 2 January 18, 2000 03:53

All times are GMT -4. The time now is 22:08.