|
[Sponsors] |
SlidingInteface adjustTimeStep and Courant problems |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
February 25, 2008, 11:52 |
Hi everybody,
I just have a
|
#1 |
Senior Member
Frank Bos
Join Date: Mar 2009
Location: The Netherlands
Posts: 340
Rep Power: 18 |
Hi everybody,
I just have a 3D spherical sliding interface around a rotating object. The case is working using moveDynamicMesh. All schemes are default and boundary conditions are just symmetric and 1 inflow and 1 outflow, so very basic. Reynolds number is about 200.... The problem is: in controlDict I've put maxCo to 0.5, but icoDyMFoam doesn't seem to care. While iterating the timestep reduces such that meanCo is about 1e-5 and maxCo about 1e-3...... Has anyone observed similar problems, could it be related to boundary conditions or to the choice of schemes? Regards, Frank
__________________
Frank Bos |
|
February 25, 2008, 12:31 |
Hi Frank
Good Evening
I
|
#2 |
Senior Member
Join Date: Mar 2009
Posts: 248
Rep Power: 18 |
Hi Frank
Good Evening I have been facing the similar problem with my sliding interface. The first guess is that the timeStep, meanCo amd maxCo are mesh size dependent. Haven't tried the same setup with a coarser mesh so cannot establish the dependence. If you are using blockMeshDict and can coarsen you mesh quickly then keep the same solver settings as now and try different mesh resolutions. Please let me know if you figure out the dependence. With Best Regards Jaswinder |
|
February 25, 2008, 16:22 |
Hi Jaswinder!
I don't use b
|
#3 |
Senior Member
Frank Bos
Join Date: Mar 2009
Location: The Netherlands
Posts: 340
Rep Power: 18 |
Hi Jaswinder!
I don't use blockMesh, and I am aware that a moving mesh with smaller cells leads to smaller timesteps and larger Courant numbers..... The problem is that I define maxCo in controlDict and the solver doesn't even come close to that value. It doesn't diverge either, the adjustable timestep just becomes very very small and the maxCo far below the desired value in controlDict. Very strange, anyone any ideas? Frank
__________________
Frank Bos |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
On the Courant number . | raintung | FLUENT | 4 | June 2, 2016 12:26 |
AdjustTimeStep question | danvica | OpenFOAM Running, Solving & CFD | 1 | January 11, 2008 05:32 |
courant no | Cfdworker | Phoenics | 5 | October 13, 2006 08:29 |
courant no. | Cfdworker | Siemens | 5 | February 12, 2006 01:04 |
Courant Number | Parshant Dhand | FLUENT | 1 | April 29, 2003 20:39 |