CFD Online Discussion Forums - save the last timestep

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save the last timestep

Hi, I have only a short question. Is it possible to save the timestep before foam shut down? I have a long calculation with adjustable timestep and long write intervals. The 'purgeWrite' option doesen't work well for me. Thanks and best regards

When does your simulation end? If you know how long you are going to run it, then you just need to match your interval in such a way you get an integer number of steps. Otherwise you need to add

Code:

runTime.writeNow()

to the solver, just before the

Code:

return 0;

statment ending the simulation.

In your system/controlDict you can use:

stopAt writeNow;

This will stop and write your fields. Hope this helps.

dear all!

i have to stop my simulation and write the current time step after a pre-specified ClockTime -> clockTimeLimit. For this task I used the runTime.writeAndEnd() function in the main while-loop of the solver:

Code:

while (runTime.run())

{

        .

        .

        .



        runTime.write();



        Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"

            << "  ClockTime = " << runTime.elapsedClockTime() << " s"

            << nl << endl;



    if(runTime.elapsedClockTime() >= clockTimeLimit)

    {

            Info<< "  Time limit reached." << nl

                  << "  Stop simulation and write current time step."

                  << nl << endl;



        runTime.writeAndEnd();

    }

}

The code works in serial but causes problem in parallel: at the moment the runTime.writeAndEnd() is executed the solver hangs and does nothing, no output in the log-file.

Does somebody have an idea what is going wrong here?

Thanks in advance!

Cheers,
Aram

hi!

i changed the code and now it seems to work in parallel:

Code:

    scalar clockTime = runTime.elapsedClockTime();

    reduce(clockTime, sumOp<scalar>());



    if(clockTime/Pstream::nProcs() >= clockTimeLimit)

    {

            Info<< "  CPU time limit " << clockTimeLimit << " s reached." << nl

                 << "  Stop simulation and write current time step."

                 << nl << endl;



            runTime.writeAndEnd();

    }

cheers,
aram