CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > STAR-CCM+

mesh quality?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 20, 2011, 21:39
Default mesh quality?
  #1
Member
 
adam
Join Date: Oct 2011
Posts: 52
Rep Power: 5
sieginc. is on a distinguished road
I'm new to using STAR-CCM and was wondering if there are some general guidelines to mesh quality? Take for instance my problem: I'm simulating the forced convection of an eletrical component (simplified as a 'block') in a duct using a baffle to help cool it. I am basically interested in knowing the surface temperatures on the block and the flow around it. There's a volume control around the block. Basically I just kept refining the mesh until my results did not seem to change. Also, is there a way to check y+ values once the mesh is created?
sieginc. is offline   Reply With Quote

Old   October 20, 2011, 22:31
Default
  #2
Senior Member
 
Join Date: Oct 2009
Location: Germany
Posts: 637
Rep Power: 12
abdul099 is on a distinguished road
There is no way to check Y+ only after meshing without solving. Y+ is not just a geometrical value but also influenced by the flow. So you need to solve at least until the solution will not change that much anymore. Then you can create a scalar scene and display y+ on all walls you are interested in.

General guidelines for mesh quality is quite simple: As high as possible. The better the mesh quality, the better the solution. When the preview of the "remove invalid cells" function finds more than just some single cells, it's always suspicious. It's also pretty often possible to create a section scene, display the mesh on the section plane and look at it near corners, edges, small features etc. When it looks bad, it is bad in the most cases.

But regarding your description, I assume, you are more interested in mesh sizes than mesh quality. Even a "perfect" mesh in terms of cell quality can be too coarse to obtain a good solution. So refining is quite important, but there is no general rule how far this should go. Some people say, as far as needed to get a mesh independent solution, but for most cases this is just impossible when one wants to get the solution still in this decade.
Anyway I think you're on a good way, as you're refining until the results seem not to change anymore.
abdul099 is offline   Reply With Quote

Reply

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] Generating Mesh for STL Car in Windtunnel Simulation tommymoose ANSYS Meshing & Geometry 48 April 15, 2013 04:24
[ICEM] trouble with mesh quality from ICEM in CFX Solver escher25 ANSYS Meshing & Geometry 0 February 28, 2011 08:38
mesh quality control and fix tachyon_me OpenFOAM Native Meshers: snappyHexMesh and Others 0 October 6, 2009 12:48
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 18:10


All times are GMT -4. The time now is 18:27.