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

implicit scheme for time step

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 21, 2006, 00:43
Default implicit scheme for time step
  #1
vivian
Guest
 
Posts: n/a
Hi,everyone,

I want to use high-order implicit scheme for time step. Which kinds of scheme should I choose for shock capturing?

Thanks!

vivian
  Reply With Quote

Old   June 21, 2006, 12:01
Default Re: implicit scheme for time step
  #2
ztdep
Guest
 
Posts: n/a
I thint to chature the shock, one need a high resolution space shemem! am i right!
  Reply With Quote

Old   June 21, 2006, 21:38
Default Re: implicit scheme for time step
  #3
vivian
Guest
 
Posts: n/a
Thank for your reply!

Yes!I think using the high-scheme for space is important. Do you think the high-scheme for time is also important or less important than high-scheme for space or can be ignored for shock capturing?

vivian
  Reply With Quote

Old   June 22, 2006, 01:27
Default Re: implicit scheme for time step
  #4
khai ching
Guest
 
Posts: n/a
It depends on the time nature of your problem. If you are concerning about steady-state solution, high-order scheme for time is less important and you should devise a time-marching scheme which can result in rapid convergence(good damping property). For real transient case, of course, higher-order scheme is attractive in terms of resolving the unsteadiness.

For shock-capturing purpose, I presume that spatial differencing scheme plays a very important role. It is crucial not only in the subject of numerical accuracy(high-order scheme) in order to allow us to resolve the shock wave sharply, the scheme must be bounded in the sense of it won't create spurious oscillations in region near the flow discontinuity, which is always the main issue of the implementation of high-order scheme.

-khai ching-
  Reply With Quote

Old   June 23, 2006, 03:47
Default Re: implicit scheme for time step
  #5
vivian
Guest
 
Posts: n/a
Thank you for your reading!

I found the resonant oscillation in my tube was not stable under the resonant frequency.It is not agree well with the literature. Is it the reason of scheme of time or other reasons?

vivian
  Reply With Quote

Reply

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
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33
Implicit Residual Smooth of Jameson Scheme hhuang84 Main CFD Forum 0 November 7, 2010 10:44
Transient simulation not converging skabilan OpenFOAM Running, Solving & CFD 12 September 17, 2007 17:48
How to choose the CFL number with implicit scheme? D.T. Main CFD Forum 2 October 23, 2002 13:56
Implicit Scheme for 1-D nozzle flow Yogesh Talekar Main CFD Forum 1 June 8, 1999 09:49


All times are GMT -4. The time now is 15:50.