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

Shallow water 2D on irregular bed

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 27, 2010, 05:38
Default Shallow water 2D on irregular bed
  #1
New Member
 
Join Date: Jul 2010
Posts: 19
Rep Power: 16
RicardoGoncalves is on a distinguished road
I'm beginning to code a 2D Shallow water solver using Godunov finite volume method with the Roe's Riemann solver.
I observed that there's quite a few publications on how to balance fluxes and source terms in the case of a non-horizontal bed surface.
I'm facing the following problem:
When the simulation begins with still water, Roe's solver outputs a non-zero flux for the first component of the flux vector (uh) due to different flow depths in both sides of the cell face. In other words, the horizontal water surface with irregular bed surface is solved in the same way as a horizontal bed with different water surface elevation, which results in a non-physical flux.
The result is a change in the water depth which can't be balanced by the source term, since the first component of the latter is zero.
I guess there must be a straightforward solution to this problem, but my search hasn't been successful. Can anyone please help me?
Thanks
Ricardo
RicardoGoncalves is offline   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
FVM on Unstructured grids for shallow water flows WLH Main CFD Forum 0 June 15, 2005 09:48
shallow water VS deep water Paul Main CFD Forum 10 August 30, 2004 12:56
multi-layer shallow water or Sigma coordinate? Hadian Main CFD Forum 0 August 8, 2002 10:53
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 10:11
uptodate water distribution network fredius,magige,tanzanian,(e.a) Main CFD Forum 0 January 27, 2002 08:10


All times are GMT -4. The time now is 17:29.