CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Speeding up size functions

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

LinkBack Thread Tools Display Modes
Old   March 19, 2006, 16:08
Default Speeding up size functions
Posts: n/a
Hi all,

I am meshing some rather complicated geometry, and I need size functions everywhere. These size functions sometimes take many minutes to compute - so if something is not working, I have to redo everything.

What determines how long a size function will run? Computing power or the size function parameters?
  Reply With Quote

Old   March 20, 2006, 10:07
Default Re: Speeding up size functions
Posts: n/a
Lots of things... the complexity of the geometry, the number of sizing functions, the types of sizing functions, the extent of the region of the sizing function, and the computing power. As a general rule, 'fixed' sizing functions are the fastest, and 'curvature' sizing functions are the slowest, with the 'meshed' and 'proximity' coming in the middle. The best way of speeding up the sizing functions (that I've found) is to split your geometry into smaller regions. That way the sizing function is only acting on a part of the volume, and doesn't have to grow from a very small size at the surface to a very large size at the boundaries. Then, only work on one volume at a time. Start with the volume that has the smallest mesh or slowest growth rates. Use the 'meshed' sizing functions to link the mesh on the volume you've just done onto the volume you're about to do. It may or may not take longer overall, but the benefit is that if there's a problem, you only have to redo the local volume.

Hope this helps, and good luck, Jason
  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
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 06:36
critical error during installation of openfoam Fabio88 OpenFOAM Installation 21 June 2, 2010 03:01
OF 1.6 | Ubuntu 9.10 (64bit) | GLIBCXX_3.4.11 not found piprus OpenFOAM Installation 22 February 25, 2010 14:43
Phase locked average in run time panara OpenFOAM 2 February 20, 2008 15:37
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 16:33.