[Simone81]

Hello,

I am running the shallowWaterFoam. I would like to have and adjustable time step based on the Courant number, see my controlDict below. My problem is that adjustTimeStep doesn't work. it seems the solver is indifferent to my controlDict setup. Any idea?

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  10
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    format      ascii;
    class       dictionary;
    object      controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

application     shallowWaterFoam;

startFrom       startTime;

startTime       0;

stopAt          endTime;

endTime         40000;

deltaT          0.5;

writeControl    runTime;

writeInterval   1;

purgeWrite      0;

writeFormat     ascii;

writePrecision  6;

writeCompression off;

timeFormat      general;

timePrecision   6;

runTimeModifiable true;

adjustTimeStep  on;

maxCo           1;

// ************************************************************************* //

[LuckyTran]

Indeed many of the basic solvers do not come with variable time stepping enabled. However, many of then can be made compatible by building your own solver. Please see this particular post for an example. In your case, create your own modified version of shallowWaterFoam by editing shallowWaterFoam.c (a good practice is to name it something else like myShallowWaterFoam). After updating the source code, build it by typing into a terminal

wmake myShallowWaterFoam

and then you can run your case by running

myShallowWaterFoam

[Simone81]

This seems very helpful, thank you!