|
[Sponsors] |
Converge but monitored parameter not constant!! |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
September 24, 2003, 07:27 |
Converge but monitored parameter not constant!!
|
#1 |
Guest
Posts: n/a
|
Hi
I've got a problem. I monitor the residual and heat transfer coefficient for convergence. When reach convergence, Iexpect both of them are constant. I had run for long time... The residual is constant and converge already but the "monitored h" is not constant, still incresing. Is the result close to the convergence result? What should I do to get the best result, more iteration? Thank |
|
September 24, 2003, 15:48 |
Re: Converge but monitored parameter not constant!
|
#2 |
Guest
Posts: n/a
|
Good observation - the heat transfer converges much slower than other properties. The explanation is that the thermal field and the thermal boundary layers first need a fairly well developed velocity field before they can start converging and the residuals are quite insensitive to the details in the temperature field.... You should monitor your heat transfer coefficient and run until it is constant, even though your residuals show that things are converged long before h stops changing. If you have very well resolved walls this can mean that you have to run much much longer (I'd guess from 2 to 10 times as long)than you would have done if you weren't looking for heat transfer.
|
|
September 24, 2003, 23:53 |
Re: Converge but monitored parameter not constant!
|
#3 |
Guest
Posts: n/a
|
thank you very much... I have some confusion - - the value of h that I observed dynamically from monitor and the value of h from Report/surface integral.. panel are difference (23.49 and 25.7, respectively). Both of them based on area-wieghted average.
What wrong I did? |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Force can not converge | colopolo | CFX | 13 | October 4, 2011 22:03 |
How to install CGNS under windows xp? | lzgwhy | Main CFD Forum | 1 | January 11, 2011 18:44 |
CGNS lib and Fortran compiler | manaliac | Main CFD Forum | 2 | November 29, 2010 06:25 |
compile errors of boundary condition "expDirectionMixed" | liying02ts | OpenFOAM Bugs | 2 | February 1, 2010 20:11 |
Really big problems when creating own materials da | Jop | FLUENT | 0 | June 28, 2007 11:15 |