CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

pre-conditioning for low mach number compressible flow solver

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 29, 2011, 22:07
Default pre-conditioning for low mach number compressible flow solver
  #1
Member
 
Shenren Xu
Join Date: Jan 2011
Location: London, U.K.
Posts: 67
Rep Power: 15
Shenren_CN is on a distinguished road
I'm learning how to implement a pre-conditioner for a compressible flow solver. I have one question about the time stepping, when a Weiss-Smith pre-conditioner is used.

So our solver is a steady flow solver, and originally local time stepping was used with multistage RK time integration. After I implemented the preconditioner (to rescale the residuals by multiplying the original residual with several matrix associated with the pre-conditioner), what change do I need to make to the time step calculation? Do I need to change the convection jacobian radius according to the pre-conditioned system (adjusted sound speed, which is close to typical flow speed) or should I keep them as they were? Does the answer depend on which kind of flux scheme I'm using (JST, Roe, AUSM+, Van Leer flux splitting)?

Thanks.
Shenren_CN 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
Low Mach number Compressible jet flow using LES ankgupta8um OpenFOAM Running, Solving & CFD 7 January 15, 2011 14:38
About compressible flow at low mach hit Main CFD Forum 2 October 26, 2009 22:21
Unaligned accesses on IA64 andre OpenFOAM 5 June 23, 2008 11:37
High Local mach number for sub sonic flow kali CFX 0 November 2, 2006 11:23
High mach number flow Logesh Main CFD Forum 12 June 30, 2003 10:43


All times are GMT -4. The time now is 02:47.