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Forum: OpenFOAM Running, Solving & CFD April 25, 2013, 04:12
Replies: 63
Views: 8,820
Posted By fredo490
This is a C++ requirement... If you use the...

This is a C++ requirement... If you use the solver, you must create the variable and if possible initialize it in case the user made a mistake or forgot it. No matter if you use it or not, the...
Forum: OpenFOAM Running, Solving & CFD April 24, 2013, 13:44
Replies: 63
Views: 8,820
Posted By fredo490
if you remove the "localEuler rDeltaT", the...

if you remove the "localEuler rDeltaT", the coefficients become useless so you actually don't even need to comment them. You can still do it for safety but you also need to check in the code what is...
Forum: OpenFOAM Running, Solving & CFD April 23, 2013, 04:29
Replies: 63
Views: 8,820
Posted By fredo490
1) The LTS algorithm is only used if you set the...

1) The LTS algorithm is only used if you set the ddt scheme a localEuler. For example in my custom mutiphase solver, I have:
ddtSchemes
{
default none;
ddt(rho,h) ...
Forum: OpenFOAM Running, Solving & CFD April 22, 2013, 13:52
Replies: 63
Views: 8,820
Posted By fredo490
You've mixed everything 1) rhoPimpleFoam: has...

You've mixed everything
1) rhoPimpleFoam: has one time step for all your domain. This time step can be dynamically controlled to match a criteria. In your case you use the Courant Number. So...
Forum: OpenFOAM Running, Solving & CFD April 22, 2013, 12:51
Replies: 63
Views: 8,820
Posted By fredo490
People usually use SonicFoam to run simulation of...

People usually use SonicFoam to run simulation of ChockTube. You need to run with small time step and try to avoid the adaptive time stepping. Choose a small enough time step and keep it constant (at...
Forum: OpenFOAM Running, Solving & CFD April 19, 2013, 01:58
Replies: 63
Views: 8,820
Posted By fredo490
With the localEuler, the time becomes a variable....

With the localEuler, the time becomes a variable. You can see a rDeltaT in the output files. This allows to "slow down" the time step in the area where the cells are very small.

The flow scale is...
Forum: OpenFOAM Running, Solving & CFD April 18, 2013, 13:50
Replies: 63
Views: 8,820
Posted By fredo490
No I didn't think about it. You can set a...

No I didn't think about it.

You can set a condition over iterations but I don't think it is good. The best is to use two different solver. Or you can also plot a warning if the velocity is too...
Forum: OpenFOAM Running, Solving & CFD April 16, 2013, 04:07
Replies: 63
Views: 8,820
Posted By fredo490
Hello, To answer your question about limiting...

Hello,
To answer your question about limiting the velocity or other variable, I would say that it can be a helpful thing to go through the first iterations. It can help to avoid some crazy values...
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