CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > ANSYS Meshing & Geometry

Maximum of Mesh Size

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

LinkBack Thread Tools Display Modes
Old   October 2, 2010, 07:26
Question Maximum of Mesh Size
New Member
Reza Abdollahpour
Join Date: Sep 2010
Posts: 1
Rep Power: 0
R.Abd is on a distinguished road
Dear All,

I am studying mesh generation of domain. I studied Wall Function and know somethings about mesh size on boundaries but unfortunately, I cant find some formula about maximum size of mesh that can use in a domain for example relation between Mesh size to Re, Turbulent intensities, . . .
Whats your idea or reference?
With regards,
R.Abd is offline   Reply With Quote

Old   October 3, 2010, 14:16
Default Max size is a limit, not a goal or requirement.
Retired from CFD Online
PSYMN's Avatar
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,665
Blog Entries: 1
Rep Power: 39
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Use the largest max size possible, but use your max ratio to limit growth...

For instance. If I had size 1 mesh at the boundary, I could set the max size to 1024 and my ratio to 1.2. Then just let the math work its way out. The max size is not forced (and may not be reached), it is simply a limit. My mesh will start to grow into the volume and will stop either when the volume is full (short of reaching my max size), or when my max size is reached, the ratio will reduce to 1 and continue at that size until the volume is full.

I usually set my max size to much larger than I actually think it will reach. The exception is if I plan a tet to hex conversion and want the mesh to stop transitioning for most of the volume.

Also keep in mind that you may also have regions in the volume that need their own local max size. This can happen in a wake or other area where you want to ensure that the mesh is fine enough to capture your physics. In that case, use a density box (ICEM CFD terminology) to control the max size locally.
PSYMN 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
engrid -> save as .stl with boundarie codes Zymon enGrid 31 August 29, 2011 13:40
unstructure mesh size control near to wall using gambit lalit kumar FLUENT 4 July 6, 2010 15:13
OF 1.6 | Ubuntu 9.10 (64bit) | GLIBCXX_3.4.11 not found piprus OpenFOAM Installation 22 February 25, 2010 14:43
Problems in compiling paraview in Suse 10.3 platform chiven OpenFOAM Installation 3 December 1, 2009 08:21
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55

All times are GMT -4. The time now is 23:22.