CFD Online Logo CFD Online URL
Home > Forums > FLUENT

problem with continuity residual

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

LinkBack Thread Tools Display Modes
Old   September 28, 2006, 05:56
Default problem with continuity residual
Posts: n/a
Sponsored Links
I'm running simulation on 3D circular chamber(20 mm section diameter x 100 mm in span). Inlet is through tube connected in the mid span (10 mm diameter) and on the opposite side there is slot cut (0.7 mm wide) that run along the span for the exit flow. I have to do both steady and unsteady simulation with constant pressure inlet and sinusoidal pressure inlet. Actually I have run steady simulation with second order scheme for pressure and momentum, K-Eps turbulence model with enhanced wall treatment(grid resolution is MAX yplus less than 3) and simplec for pressure velocity coupling. The problem is that convergence is quite good (10-6) for velocity and turbulence parameter, but continuity residual does not go under 10-4, remain steady...

is normal that continuity residual does not go under certain values or I can do something to improve results?thank you in advance bye, dario

  Reply With Quote
Sponsored Links

Old   October 1, 2006, 07:23
Default Re: problem with continuity residual
Ralf Schmidt
Posts: n/a

I think, thats ok... someone told me, sometimes, the continuity residual has to be under 10-3 and steady.

BUT one more interesting convergenz criteria is a point or surface monitor.

Create a point, that is in an area of high gradient of an intersting value (eg. velocity). Now, use report->monitor->surface and select the point and eg. average velocity.

  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
Darcy-Forchheimer law for specifying Porous Zones Ger_US OpenFOAM Running, Solving & CFD 31 August 5, 2017 03:00
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33
Upgraded from Karmic Koala 9.10 to Lucid Lynx10.04.3 bookie56 OpenFOAM Installation 8 August 13, 2011 04:03
Orifice Plate with a fully developed flow - Problems with convergence jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 05:24
Convergence moving mesh lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 15:09

Sponsored Links

All times are GMT -4. The time now is 01:05.