CFD Online Logo CFD Online URL
Home > Forums > CFX

problem mesh scale

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

LinkBack Thread Tools Display Modes
Old   May 28, 2010, 09:16
Default problem mesh scale
New Member
Join Date: Mar 2010
Posts: 8
Rep Power: 7
jc_muaddib is on a distinguished road
I'm using cfx-mesh for the first time and I'm doing a hvac simulation of a big workshop. And I have some problems to get a mesh as I would like. Indeed there are quite a lot of devices which complicate the design; and when I have tried to mesh, one time I got this error: It's continually adding and removing the same element (I think it's because the mesh scale it's to big for a part of my geometry).
But when I have refined the mesh until the error disappeared, the generation time for meshing became to long. I try to use proximity only to refine the part causing the error but I was only able to use it for the entire volume.
So finally my questions are:
How can I refine only a part of a volume (as in icem)?
Should I simplify my geometry? (but in this case the simulation would be affected)

I'm looking for your hints!
jc_muaddib is offline   Reply With Quote

Old   May 28, 2010, 12:27
New Member
Join Date: May 2010
Posts: 26
Rep Power: 7
Jordi is on a distinguished road
Sometimes small details can be simplified... If your domain is big as you say I would suggest bodies and shapes be "smoothed out". This easies the mesher work, your waiting time and your computer load...
Anyways, simulations are approximations to real behaviour, and you always can make it more complex.
For fluids it's important to set up inflations at the walls, because fluid speed is zero.
You can partition your fluid domain into as many volumes as needed and set different size limits for each domain
Jordi is offline   Reply With Quote

Old   May 31, 2010, 10:38
New Member
Join Date: Mar 2010
Posts: 8
Rep Power: 7
jc_muaddib is on a distinguished road

I'll try to simplify the geometry and refine the mesh in some critical parts.

Thanks for the explanations!
jc_muaddib 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
Moving mesh problem Geon-Hong FLUENT 3 April 5, 2010 03:24
Ansys 12 Workbench problem when generating volume mesh Sveink ANSYS 5 January 6, 2010 04:17
[GAMBIT] Problem with mesh. Please Help... maziboss ANSYS Meshing & Geometry 1 September 28, 2009 02:24
mesh generation problem Ellen FLUENT 7 February 18, 2009 22:20
The problem with GAMBIT - using two mesh sizes. Owen FLUENT 2 June 22, 2005 05:16

All times are GMT -4. The time now is 20:27.