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Forum: OpenFOAM Bugs April 3, 2007, 10:34
Replies: 26
Views: 4,343
Posted By rolando
Thanks a lot for that post Fra

Thanks a lot for that post Frank,
I tested it and the timestep oscillations are no longer present.

Rolando
Forum: OpenFOAM Bugs April 2, 2007, 06:13
Replies: 26
Views: 4,343
Posted By rolando
Hello Hrvoje, I tried the ver

Hello Hrvoje,
I tried the version you sent me and experimented with it.
For my testcase I noticed two things.
The testcase is a mesh moving, with a constant velocity and a relative flow in the...
Forum: OpenFOAM Bugs March 30, 2007, 05:49
Replies: 26
Views: 4,343
Posted By rolando
Thanks Henry, I´ll try to fin

Thanks Henry,
I´ll try to find a proper time-step adjustment for that kind of problem.

Rolando
Forum: OpenFOAM Bugs March 30, 2007, 05:34
Replies: 26
Views: 4,343
Posted By rolando
Thanks Henry, if I got you ri

Thanks Henry,
if I got you right, it seems to be a stability problem inherent in the backward scheme.
The Euler scheme as posted above works well, even the Crank-Nicholson scheme works well (for...
Forum: OpenFOAM Bugs March 30, 2007, 04:31
Replies: 26
Views: 4,343
Posted By rolando
Hello Hrvoje, I´m now using y

Hello Hrvoje,
I´m now using your new version of backwardDdtScheme.C and I´m experimenting quite a lot with it.
It works better than the original version, but the problem is not cured. ...
Forum: OpenFOAM Bugs March 29, 2007, 04:48
Replies: 26
Views: 4,343
Posted By rolando
Hello Henry, thanks for that.

Hello Henry,
thanks for that.

Rolando
Forum: OpenFOAM Bugs March 28, 2007, 12:18
Replies: 26
Views: 4,343
Posted By rolando
Hello Hrvoje, I´m still compi

Hello Hrvoje,
I´m still compiling your development version.

1) I had problems with the files skewLinear.C and leastSquaresGrad.C. They both use the method mesh(), which is not yet implemented...
Forum: OpenFOAM Bugs March 28, 2007, 10:14
Replies: 26
Views: 4,343
Posted By rolando
Thanks a lot Henry, Rolando

Thanks a lot Henry,

Rolando
Forum: OpenFOAM Bugs March 28, 2007, 08:21
Replies: 26
Views: 4,343
Posted By rolando
Henry, that´s also what I not

Henry,
that´s also what I noticed. The Cranck Nicholson scheme is very unstable at that high Co.
But I will try it with the coefficient of 0.9.

Do you mean the nonlinear loop around the...
Forum: OpenFOAM Bugs March 28, 2007, 07:59
Replies: 26
Views: 4,343
Posted By rolando
Henry, what do you mean with

Henry,
what do you mean with a sufficiently small Courant number?
I use max Co of about 1.5. Therefore I use an additional nonlinear loop around all equations.

By the way, what small amount...
Forum: OpenFOAM Bugs March 28, 2007, 07:52
Replies: 26
Views: 4,343
Posted By rolando
Hello Hrvoje, is it possible

Hello Hrvoje,
is it possible to get a patched version of OpenFOAM-1.3?
This would help me to continue my work, while waiting for 1.4.

Rolando
Forum: OpenFOAM Bugs March 28, 2007, 07:42
Replies: 26
Views: 4,343
Posted By rolando
Thanks Henry. I think the fir

Thanks Henry.
I think the first order Euler scheme is not the correct choise for what I´m planning to do. I hope to do some LES calculations with a moving grid.
Would it meanwhil be incorrect to...
Forum: OpenFOAM Bugs March 28, 2007, 07:26
Replies: 26
Views: 4,343
Posted By rolando
Hi Henry, after quickly looki

Hi Henry,
after quickly looking at the case, it seems to work with the Euler scheme.

Rolando
Forum: OpenFOAM Bugs March 28, 2007, 07:08
Replies: 26
Views: 4,343
Posted By rolando
Hi, I had some troubles exper

Hi,
I had some troubles experimenting with moving meshes using an adjustable time step with the icoDyMFoam solver.
If I use a timestep, which is far from the "optimal" one at the beginning of the...
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