CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

CFD Convergence

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

LinkBack Thread Tools Display Modes
Old   August 29, 2002, 04:45
Default CFD Convergence
Posts: n/a
Hello everyone,

I'm a rookie in the CFD simulations, therefore, perhaps my question could be a little stupid... but anyway I have to ask because I have a great headache for its guilty. I am trying to simulate the steady flow conditions in a complex geometry compartment by CFD. The liquid studied is water and I am running a commercial package (Femlab).

In order to start the simulation of the system with an accurate approximation of velocity and pressure profile values I have started simulating the system with high values of viscosity and after I have decreased them, but, when I have arrived near a value of 0.0035 for the viscosity of the water I find that the system doesn't converge and I don't get any accurate value. I have test several options like iterative methods, adaptive methods, and I have also tried to increase the mesh near the boundaries of my geometry, but it doesn't work.

Could someone help me? Thank you in advance

PD: Excuse my poor English. Thank you again.
  Reply With Quote

Old   September 4, 2002, 22:53
Default Re: CFD Convergence
Posts: n/a
reduce viscosity = increase Re number, It is well known when Re is high, flow instability occurs, which makes steady-state convergence impossible.
  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 with Min/max rho tH3f0rC3 OpenFOAM 7 February 23, 2013 06:37
CFD for fans & blower housings David Carroll Main CFD Forum 8 August 24, 2000 17:25
ASME CFD Symposium, Atlanta, July 2001 Chris R. Kleijn Main CFD Forum 0 August 21, 2000 04:49
PC vs. Workstation Tim Franke Main CFD Forum 5 September 29, 1999 15:01
Which is better to develop in-house CFD code or to buy a available CFD package. Tareq Al-shaalan Main CFD Forum 10 June 12, 1999 23:27

All times are GMT -4. The time now is 07:51.