CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Hex versus Tet

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

LinkBack Thread Tools Search this Thread Display Modes
Old   March 11, 2010, 16:26
Default Hex versus Tet
Senior Member
Join Date: Feb 2010
Posts: 148
Rep Power: 17
Jade M is on a distinguished road
I am running a CFX problem with laminar flow through a duct. The fluid flows through some fins in the middle of the duct.

When I mesh with tet, for the same number of nodes, the run times for the tet are significantly greater than those for the hex. It seems that it takes much longer for the tet mesh's solution to converge (a lot more iterations). Why? I am assuming that the matrix size is the same as it is proportional to the number of nodes, correct?

Also, for a hex mesh, the number of nodes and number of elements are about the same. For a tet mesh, the number of elements is much larger than the number of nodes. Why?

Thanks so much for some greatly needed explanations!
Jade M is offline   Reply With Quote

Old   March 11, 2010, 23:41
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,690
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
The node/element counts is explained in the documentation, in the section which describes the control volumes.

How big an effect hex vs tet makes is problem dependent. If you are doing a simple incompressible flow it won't make much difference. If you are doing complex stuff like free surfaces, shock waves, etc etc the improved mesh quality in a hex mesh can make a huge difference.
ghorrocks is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] how can i create a consistent transitions between tet and hex? specifically my model? snailstb ANSYS Meshing & Geometry 3 March 15, 2010 20:26
CheckMeshbs errors ivanyao OpenFOAM Running, Solving & CFD 2 March 11, 2009 02:34
poly, hex dom, hex, tet azmir Siemens 0 October 31, 2007 19:24
hex mesh vs. tet mesh (for FEM solvers) Sam Main CFD Forum 0 July 1, 2005 15:11
HEX vs. TET Selina Tracy Main CFD Forum 1 May 10, 2001 05:19

All times are GMT -4. The time now is 07:24.