CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

HIgh viscosity - convergence issues

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 12, 2014, 08:57
Default HIgh viscosity - convergence issues
  #1
New Member
 
Rams Manu
Join Date: Oct 2013
Posts: 21
Rep Power: 12
manxu is on a distinguished road
Hi,

I am running a simple flow through a pipe. The pipe has flowing water and oil trapped beneath. I am using VOF explicit scheme with CICSAM.

When I run for oil viscosity comparable to water the number of iterations required per time step to converge (to 1e-6) is just 1 or 2 iterations.

But when I increase the oil viscosity, the residuals does not reach 1e-6 even if have 100 iterations/time step.

My courant number is around 0.2 and Re around 0.5

Is there anything that can be done to improve the convergence ?


Manxu
manxu is offline   Reply With Quote

Reply

Tags
convergence issues, high viscosity

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Convergence issues with Porous interface oj.bulmer CFX 5 January 24, 2013 04:53
not convergence in high angle of attack in low reynold number nuimlabib Main CFD Forum 1 October 2, 2009 14:10
Convergence of CFX field in FSI analysis nasdak CFX 2 June 29, 2009 01:17
stagged grid solution is high of numer viscosity? HT Main CFD Forum 13 March 4, 2004 12:26
SIMPLE for variable viscosity, poor convergence ? Anthony Ilaner Main CFD Forum 15 July 13, 2000 08:04


All times are GMT -4. The time now is 01:35.