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

the flux limiter

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 13, 2006, 09:44
Default the flux limiter
  #1
prapanj
Guest
 
Posts: n/a
could someone here please explain to me about the flux limiter and its used and implications in finite volume methods? thank you
  Reply With Quote

Old   October 13, 2006, 09:54
Default Re: the flux limiter
  #2
ganesh
Guest
 
Posts: n/a
Dear Prapanj,

Higher order spatial accuracy can be achieved in finite volume schemes using a concept referred to as "Reconstruction". Reconstruction involves gradients, and these gradients could become numerically spurious in some regions (esp. shocks and discontinuous regions), and this could lead to convergence problems. The underlying issue is that there is no monotone scheme that is more than first order accurate. The attempt for a higher order accuracy is at the expense of loss in monotonicity (and a loss in stability) ending in code blow up. To achieve a higher order monotone scheme, monotonicity needs to be enforced, which is what limiting essentially does. Limiting could be done in two ways, either limit the gradients involved in the reconstruction procedure, before computing the flux, or, compute the fluxes with the numerical gradients as they are, and then limit the flux, where they need to be. The second kind is what are referred to as flux limiters.

Hope this helps

Regards,

Ganesh

  Reply With Quote

Old   October 13, 2006, 13:17
Default Re: the flux limiter
  #3
prapanj
Guest
 
Posts: n/a
thank u that was indeed helpful. and could u guide me what materials are available for learning more on them (about the limiters themselves) and also on the methods of limiting the gradients... thank you.
  Reply With Quote

Old   October 13, 2006, 17:36
Default Re: the flux limiter
  #4
Father Jack
Guest
 
Posts: n/a
Was this not used in back-to-the-future?? In this case it is used for time travel.
  Reply With Quote

Old   October 15, 2006, 00:08
Default Re: the flux limiter
  #5
ganesh
Guest
 
Posts: n/a
Dear Prapanj,

Check out the flux limiters dextion on CFD-Wiki and the references therein. You can go on to more deeper issues from thereon

Regards,

Ganesh

  Reply With Quote

Reply


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
Ultimate Flux Limiter gentela Main CFD Forum 1 August 2, 2016 21:55
slope limiter and flux limiter ?? Ameya J Main CFD Forum 1 June 13, 2011 13:05
flux limiter involving tensor : How to use fvc::flux() with volTensorField ? Cyp OpenFOAM Programming & Development 2 January 21, 2011 05:36
Lax-Wendroff flux, using any flux limiter mcaro Main CFD Forum 1 September 30, 2010 12:37
Flux Limiter Q. Liu Main CFD Forum 4 August 6, 1999 23:36


All times are GMT -4. The time now is 16:23.