CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM

Use of face centered differences in gradient computation

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

LinkBack Thread Tools Display Modes
Old   August 25, 2011, 05:56
Default Use of face centered differences in gradient computation
New Member
Henning Heiberg-Andersen
Join Date: Aug 2011
Location: Bergen, Norway
Posts: 2
Rep Power: 0
henningh is on a distinguished road

According to the recent work of Richrds and Norris (J. Wind Eng Ind.Aerodyn 99 (2011) 257-266), the near ground spike in turbulent kinetic enery in the k-epsilon
model originates from an inconsistency in the discretization. This error can be removed by computing all gradients in terms of face centered differences.

Can this shift be achieved by any of the options in the fvSchemes file?

Best regards,
Henning Heiberg-Andersen
henningh is offline   Reply With Quote

Old   August 25, 2011, 09:34
Senior Member
Steven van Haren
Join Date: Aug 2010
Location: The Netherlands
Posts: 149
Rep Power: 9
stevenvanharen is on a distinguished road
Are you sure this is not already being done?

I think discritization (53) from the paper you refer to is not possible in an unstructered code.

Furthermore, in kEpsilon.C:

volScalarField G("RASModel::G", nut_*2*magSqr(symm(fvc::grad(U_))));
where fvc::grad(U_) are the gradients at the face.

Is this what you were referring to?
stevenvanharen is offline   Reply With Quote

Old   August 25, 2011, 11:41
Super Moderator
praveen's Avatar
Praveen. C
Join Date: Mar 2009
Location: Bangalore
Posts: 277
Blog Entries: 6
Rep Power: 11
praveen is on a distinguished road
I have asked this question before

and I think there is no such scheme available. Please correct me if I am wrong.
praveen 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
Import netgen mesh to OpenFOAM hsieh Open Source Meshers: Gmsh, Netgen, CGNS, ... 32 September 13, 2011 05:50
BlockMeshmergePatchPairs hjasak OpenFOAM Native Meshers: blockMesh 11 August 15, 2008 07:36
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
Axisymmetrical mesh Rasmus Gjesing (Gjesing) OpenFOAM Native Meshers: blockMesh 10 April 2, 2007 14:00
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15

All times are GMT -4. The time now is 20:16.