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

domain decomposition

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 22, 2010, 12:24
Default domain decomposition
  #1
New Member
 
Join Date: Jun 2009
Posts: 27
Rep Power: 8
dshawul is on a distinguished road
Hello,
I am trying to implement a non-overlaping domain decomposition solution using a dirchlet-neumman algorithm for exchanging information at ghost cells.
The velocity prediction is solved correctly but I have a problem with the pressure solution. When I try to solve the cavity flow split in to two domains at the middle,
I get very big values for the left and right domain due to the all round Neumann boundary condition for one of the domains. Since it is incompressible solver,
only relative pressures are important. The way I did it before is to finish the solution with whatever values the solver comes up,
then decrement the value of the reference pressure during post processing. How to handle this in DD I don't know.

Also it seems to work with an SOR solver which gives value of p close to 0 (the initial guess). CG solver fails with big values in the first iterations.

I would like to avoid solving a coarse problem to coordinate solutions between different solvers, which is the reason why I am trying to use dirichlet-neumman algorithm (If I understood correctly).
I am new to this field and any hints or explanations of the algorithms are very welcome.
thanks in advance
dshawul is offline   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
Domain decomposition method Bram OpenFOAM 4 August 19, 2010 18:14
Mesh generation software for Domain Decomposition ali987 Main CFD Forum 0 November 10, 2009 12:06
CFX - domain decomposition. Urgent!!!! Elena Saldaeva CFX 4 June 30, 2008 07:18
CFX Solver Memory Error mike CFX 1 March 19, 2008 08:22
Domain decomposition rajesh Main CFD Forum 2 August 31, 1999 04:22


All times are GMT -4. The time now is 11:38.