CFD Online Logo CFD Online URL
Home > Forums > FLUENT

help high initial residuals

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

LinkBack Thread Tools Display Modes
Old   October 11, 2007, 09:04
Default help high initial residuals
Posts: n/a

Hope any mathematician can help me.

I am not using a cfd code but using a propriety code (not much inofrmation is avaiable about it) based on two fluid model with staggered mesh scheme. I have used steady state flowrates values as input BC with outlet BC constant at atmospheric pressure, I got results that were far from experimental values.

next I tired putting experimental values (flow rates) as input BC keeping outletBC constant at atmpospheric pr. I also tried the reverse keeping experimental measured time series at outlet and keeping inlet BC (steady state values) at inlet BC. what I want to know is that in both cases there are few scattered high residual peaks in initial simulation till 400s (t=0 to 3600s) and then the residuals drops down to 10-8 and below. I was wondering whether the trends (of varaibles like P, V etc) obtained in first 500s are the artfacts of these initail high residuals peaks or physics behind the phenomena?

looking forward to hear any suggestion.


  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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Orifice Plate with a fully developed flow - Problems with convergence jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 05:24
Extrusion with OpenFoam problem No. Iterations 0 Lord Kelvin OpenFOAM 6 April 12, 2011 11:24
Differences between serial and parallel runs carsten OpenFOAM Bugs 11 September 12, 2008 11:16
Multicomponent fluid Andrea CFX 2 October 11, 2004 05:12

All times are GMT -4. The time now is 23:40.