CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ...

How to make a good Low-Re Mesh ?

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

LinkBack Thread Tools Display Modes
Old   February 12, 2010, 05:48
Default How to make a good Low-Re Mesh ?
Jérémy Bulle
Join Date: Nov 2009
Posts: 93
Rep Power: 9
Gearb0x is on a distinguished road
Sponsored Links

I've read the wiki about general tips to make a good low-re mesh but it seems I still have problem with mine since openfoam gives weird result and our professor told us that the problem is probably the mesh (speed seems ok but pressure does not converge)

My geometry is similar to a pipe with the dimensions :
Hydraulic diameter : 0.08m
Length : 0.8m

So i would like to know :

- How can you know the size of the boundary layer approximately? How do you mesh it?
To make it simple I have a straight 2D-Path, so it has 2 walls. What I did is cut it in three parts : 2 near the wall for the boundary layer, one for the central path.
I mesh the two sides path with a 0.0001 interval length and no grading (0.0001 is it good? How can I know since y+ tools given in the wiki to estimate the first cell place gives me values about 0.000001 wich are VERY small to me ...)

I mesh the central path beginning with 0.001 and going to 0.01 to not have an abrupt change of the cell size.

For the perpendicular meshing to the boundary layer mesh I mesh with a no grading 0.01 interval length.

Can you tell me if it seems ok or where I could be wrong?

Thank you very much for the help!
Gearb0x is offline   Reply With Quote
Sponsored Links


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] Hexa mesh, curve mesh setup, bunching law Anorky ANSYS Meshing & Geometry 4 November 12, 2014 01:27
Check the skewnesses of your face meshes and make sure the face mesh sizes are not to sophie-l ANSYS Meshing & Geometry 0 April 13, 2009 17:27
how to extend FSI 2D codes to 3D, need advises abouziar Main CFD Forum 1 May 30, 2008 04:08
Jason- Union of 2 volumes Vidya Raja FLUENT 13 November 2, 2005 09:18
unstructured vs. structured grids Frank Muldoon Main CFD Forum 1 January 5, 1999 11:09

Sponsored Links

All times are GMT -4. The time now is 10:32.