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

Conformal Mesh

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

LinkBack Thread Tools Display Modes
Old   March 11, 2010, 17:16
Default Conformal Mesh
Senior Member
Join Date: Feb 2010
Posts: 145
Rep Power: 10
Jade M is on a distinguished road
I am new to finite element modelling of fluid dynamics and heat transfer. What is the definition of a conformal mesh? Why does it matter? When and why is it better to have a conformal mesh?

Thanks so much for any greatly needed help!
Jade M is offline   Reply With Quote

Old   March 13, 2010, 17:37
Senior Member
John Chawner
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 257
Rep Power: 11
jchawner is on a distinguished road

Let's start from the basics. If your mesh isn't conformal, it's non-conformal. By conformal, we mean that the cell boundaries conform to the shape of the boundary you're trying to simulate. A non-conformal mesh, therefore, does not conform to the boundary shape.

As an example of a non conformal mesh, image you're simulating flow over an airfoil and your grid is a cartesian mesh like a sheet of graph paper with only constant x and constant y grid lines. If you zoom in on the airfoil, you'll see that the airfoil shape cuts through some of the cells in your grid. Your solver has to account for that somehow. One way is to "stairstep" the grid by eliminating cells inside or cut by the boundary. The resulting mesh is highly irregular, leaving a jagged hole where the airfoil was. A second way is to compute how the airfoil cuts each cell leaving behind only a fraction of a square (in my graph paper analogy). Then your solver has to account for cells that are polygons.

So a non-conformal grid introduces accuracy problems due to resolving the boundary shape and complexity issues in the solver.

Hope this wasn't too basic an answer to your question.
John Chawner / /
on Twitter: @jchawner
jchawner is offline   Reply With Quote

Old   March 14, 2010, 05:05
Super Moderator
praveen's Avatar
Praveen. C
Join Date: Mar 2009
Location: Bangalore
Posts: 264
Blog Entries: 6
Rep Power: 11
praveen is on a distinguished road
In the context of FEM, conformal mesh means that there are no hanging nodes.
praveen is offline   Reply With Quote

Old   March 18, 2010, 13:10
Default Thanks!
Senior Member
Join Date: Feb 2010
Posts: 145
Rep Power: 10
Jade M is on a distinguished road
The more basic, the better! Thanks so much. This really helps. Take good care.
Jade M 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] Hexa Mesh Smoothing Jules ANSYS Meshing & Geometry 6 December 4, 2010 19:00
problem when converting mesh (made by ICEM) using fluentMeshToFoam Forrest_Lei OpenFOAM 11 October 16, 2009 06:28
conformal vs. non conformal mesh otho Main CFD Forum 2 May 30, 2008 11:11
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
General questions on grid-based computing Adrin Gharakhani Main CFD Forum 21 June 5, 2000 13:47

All times are GMT -4. The time now is 18:33.