CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Preconditioning in 3D

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

LinkBack Thread Tools Display Modes
Old   February 28, 2006, 07:39
Default Preconditioning in 3D
Posts: n/a
Dear Friends,

I am trying out low speed preconditioning in 3D. I am using a preconditioned Roe scheme along with Weiss-Smith matrix for solving the problem. However, I am facing difficulties in convergence/oscillatory(badly!) contours of pressure/velocity. My test case is the inviscid flow past an ONERA M6 wing. The code with preconditioning goes through for higher Mach numbers, with good results, but problems begin at lower mach. The grid is relatively coarse. I believe that the problem is in definition of Uref. Can anyone with experience in 3D preconditioning throw some light on the issue? The 2d preconditioned solver derived from this 3d solver works absolutely fine for mach numbers as low as 1e-4.

All suggestions are welcome

Thanks in advance, Regards,


  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
Roe implement about preconditioning ricklee Main CFD Forum 7 July 7, 2006 06:14
Re: Preconditioning for moving grids ganesh Main CFD Forum 0 April 6, 2006 06:18
source code for low mach number preconditioning CFD student Main CFD Forum 0 September 30, 2004 01:19
implementing preconditioning clifford bradford Main CFD Forum 0 October 19, 2000 16:03
local preconditioning Manish Jaiman Main CFD Forum 3 May 1, 2000 08:31

All times are GMT -4. The time now is 06:13.