# problem with continuity residual

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

 September 28, 2006, 05:56 problem with continuity residual #1 dario Guest   Posts: n/a 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

 October 1, 2006, 07:23 Re: problem with continuity residual #2 Ralf Schmidt Guest   Posts: n/a Hi! 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. Ralf

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Ger_US OpenFOAM Running, Solving & CFD 23 July 30, 2015 13:00 xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33 bookie56 OpenFOAM Installation 8 August 13, 2011 04:03 jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 05:24 lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 15:09

All times are GMT -4. The time now is 15:10.