CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

mesh quality

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

Like Tree1Likes
  • 1 Post By PSYMN

Reply
 
LinkBack Thread Tools Display Modes
Old   May 2, 2009, 02:20
Default mesh quality
  #1
New Member
 
uk jha
Join Date: Apr 2009
Posts: 16
Rep Power: 8
u k jha is on a distinguished road
high i am creating the mesh in th icem cfd how much quality is preferred for the simulation
u k jha is offline   Reply With Quote

Old   May 3, 2009, 14:45
Default Quality...
  #2
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,662
Blog Entries: 1
Rep Power: 35
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
You need to give more details... What is the mesh type and what is the solver?

Hexa solvers usually want a min angle of 9 to 18 degrees, hexa determinant should be above 0.1 or 0.2. Warpage and other factors should also be looked at.

Tetra mesh should have an "ICEM CFD quality" of greater than 0.2, but some cells below that are ok provided they are not in critical areas.

The ICEM CFD "Quality" metric is pretty harsh on Prism mesh (divides the prism into three virtual tetras and takes the worst normalized circumsphere ratio of the three), but usually Prisms of over 0.01 will run.

They just added a TGrid Skew quality metric to ICEM CFD 12.0 that matches TGrid exactly, if that is what you are looking for (remember TGrid is inverted so 0 is good and 1 is bad)

Of course your solver matters also... Some solvers are very tolerant of bad internal angles, but are sentitive to volumetric change. Others are the other way around. Some would prefer poor prisms to any pyramids, others would prefer a few decent pyramids rather than poor prisms.

I recomend checking the requirements with your solver's documentation. Keep in mind that there is usually a decent factor of safty there so they can blame the mesher if things don't converge.
diamondx likes this.
PSYMN is offline   Reply With Quote

Reply

Tags
mesh quality

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
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
basic of mesh refinement arya CFX 4 June 19, 2007 12:21
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 18:10
mesh quality julie FLUENT 5 July 26, 2004 05:31
Mesh quality measures on quad-dominant meshes Kerrin Burnnand Main CFD Forum 0 May 10, 2001 03:47


All times are GMT -4. The time now is 14:24.