|March 31, 2010, 05:10||
help: results depend on writeInterval
Join Date: Mar 2010
Posts: 1Rep Power: 0
Hi everyone !
I am using OpenFOAM for simulating solidification of a two immiscible fluids. For that, I augmented the interFoam solver with a few things such as heat-treatment, thermophysical properties and a solidification model. As you can imagine, the solver-code now looks pretty different to the original one. So far, my first runs gave me promising results.
yesterday when I did a long-time simulation, the results differed heavily from former ones.
My first runs, which gave me physically feasible results, used a delta_t of 1e-3 sec and I wrote out every 10th timestep.
Then the long-time run used the same delta_t of 1e-3 sec but a writeInterval of 1000 timesteps (to have one data folder for each second). So far the code ran smoothly with little courant-no and continuity-errors. But the visualization showed highly unphysical behaviour that differed heavily from the runs with every 10th timestep written out.
I did NOT change the delta_t, ONLY the writeInterval.
Has anyone made a similar experience ?
Any idea on what could cause that behaviour ?
I guess my code overwrites a variable from the last timestep with a value that it reads from the last written-out folder. But apart from the createFields.H (which I definately only use once BEFORE the time-loop) I could not find any read-and-write command, at least in the code lines I did by myself.
Does anyone know of OpenFOAM reading values from the last WRITTEN-OUT timestep rather than using the value from the actual last timestep ?
I am using 1st order "Euler" as ddt-scheme and my controlDict looks as follows
Thanks a lot for any suggestions and best regards,
|March 31, 2010, 07:39||
Have you made sure that you don't have alpha1=0 in your visualising of the results? This can give strange results with phases.
|September 1, 2010, 18:42||
Join Date: Nov 2009
Posts: 48Rep Power: 8
Have you managed to solve your problem? Would you please explain how did you implement a solidification in interFoam.
Is it possible to share your implementation?
|different results, interfoam, read error, read results, writeinterval|
|Thread||Thread Starter||Forum||Replies||Last Post|
|OpenFOAM - Validation of Results||Ahmed||OpenFOAM Running, Solving & CFD||9||June 22, 2011 18:59|
|Different Results from Fluent 5.5 and Fluent 6.0||Rajeev Kumar Singh||FLUENT||6||December 19, 2010 12:33|
|compile errors of boundary condition "expDirectionMixed"||liying02ts||OpenFOAM Bugs||2||February 1, 2010 21:11|
|validation of CFD results||andy||FLUENT||0||June 13, 2007 13:55|
|Problems with repeating results||Lee||CD-adapco||4||May 26, 2006 03:39|