CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Meshing & Mesh Conversion

[Commercial meshers] How to make a good Low-Re Mesh ?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 12, 2010, 05:48
Default How to make a good Low-Re Mesh ?
  #1
Senior Member
 
Join Date: Nov 2009
Posts: 111
Rep Power: 16
Gearb0x is on a distinguished road
Hello,

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

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Parameters of a good airfoil mesh CharlieBra7o Mesh Generation & Pre-Processing 4 November 20, 2018 15:42
[snappyHexMesh] SHM problem : KVLCC2 with appendage mesh sc.park OpenFOAM Meshing & Mesh Conversion 1 March 13, 2016 14:28
[snappyHexMesh] SnappyHexMesh no layers and no decent mesh for complex geometry pizzaspinate OpenFOAM Meshing & Mesh Conversion 1 February 25, 2015 08:05
Installation OF1.5-dev ttdtud OpenFOAM Installation 46 May 5, 2009 03:32
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 19:10


All times are GMT -4. The time now is 10:04.