CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Running, Solving & CFD

Problem in simulation

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

LinkBack Thread Tools Display Modes
Old   July 21, 2009, 07:28
Default Problem in simulation
Senior Member
Antonio Martins
Join Date: Mar 2009
Location: Porto, Porto, Portugal
Posts: 112
Rep Power: 10
titio is on a distinguished road
Send a message via MSN to titio Send a message via Skype™ to titio
Hi Foamers,

I am starting to feel desperate. I am simulating the flow of complex fluids in OpenFoam, where extra tensions are significant. In the momentum balance equations there is an extra divergence term of the extra tension. Right now, I am doing the simulations imposing in the fvSchemes upwind for the advection terms, but the divergence of extra tension is discretized using Gauss Linear Corrected.

I noticed that the behaviour is better, but, when the extra tension is large, ths simulation blows suddenly. It starts converging, and out of the blue the velocity and pressure values.

What I can do to avoid this? Some possibilities I am thinking of are:

- instead of starting with a flow field with zero velocity use a flow field that has converged and then change the parameters.
- use other linear solvers or reduce the total errors.
- try other relaxation factors.

Has anybody other ideas.


titio is offline   Reply With Quote


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
problem in tornado simulation with FLUENT, please help Kestas FLUENT 10 April 25, 2012 06:20
Problem of heat balance in Coal Boiler simulation DG FLUENT 9 December 25, 2008 21:57
problem of river flow simulation Liu Main CFD Forum 0 May 27, 2004 22:01
2D simulation as boundary condition for 3D problem Jan De smet FLUENT 1 October 11, 2002 02:02
simulation of incineration problem xinxin Main CFD Forum 1 November 27, 1999 17:34

All times are GMT -4. The time now is 13:08.