CFD Online Discussion Forums - Stop Openfoam simulation

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Stop Openfoam simulation

evening everyone. does anyone know the command to stop an openfoam simulation/

Quote:

Originally Posted by deji (Post 234738)

evening everyone. does anyone know the command to stop an openfoam simulation/

Simply kill the process, or, if you want something more elegant set

stopAt writeNow; // It stops the simulation after writing data for the current time step

or

stopAt noWriteNow; // It stops the simulation without writing data for the current time step

in the controlDict dictionary and save it.

Best,

Quote:

evening everyone. does anyone know the command to stop an openfoam simulation/

foamPullPowerPlug works in openfoam1.6-dev
http://www.cfd-online.com/Forums/ima...apse_thead.gif

Quote:

Originally Posted by deji (Post 234738)

evening everyone. does anyone know the command to stop an openfoam simulation/

In time-loop of my solvers I look for the existence of an "ABORT" file. If it exists, the runtime does 'runTime.writeAndEnd();'

From the command-line, a simple "touch ABORT" suffices without needing to edit any files.

For general reference (in case anyone else wants to add it to their solvers):

Before the time-loop begins:

Code:

// define ABORT file for stopping the job

fileName abortName(args.rootPath()/args.globalCaseName()/"ABORT");

if (isFile(abortName))

{

    Info<< "removing old ABORT file" << endl;

    rm(abortName);

}

Within the time-loop itself (near the bottom):

Code:

if (isFile(abortName))

{

    Info<< "reacting to user ABORT" << endl;

    runTime.writeAndEnd();

}

After the time-loop:

Code:

// cleanup ABORT file

if (isFile(abortName))

{

    rm(abortName);

}

It should really be rewritten to act as a functionObject, but I've never gotten around to it.

/mark

Quote:

Originally Posted by olesen (Post 234767)

Code:

// define ABORT file for stopping the job

fileName abortName(args.rootPath()/args.globalCaseName()/"ABORT");

if (isFile(abortName))

{

    Info<< "removing old ABORT file" << endl;

    rm(abortName);

}

Within the time-loop itself (near the bottom):

Code:

if (isFile(abortName))

{

    Info<< "reacting to user ABORT" << endl;

    runTime.writeAndEnd();

}

After the time-loop:

Code:

// cleanup ABORT file

if (isFile(abortName))

{

    rm(abortName);

}

It should really be rewritten to act as a functionObject, but I've never gotten around to it.

/mark

Really, I run parallel and after simulation stop (I do like you), it makes errors. Can you help me?

This is my code

if( errors <= 0.001 )
{
Info<< "reached convergence"<< endl;
runTime.writeAndEnd();
Info<< "latestTime = " << runTime.timeName() << endl;
}

This is error

--------------------------------------------------------------------------
mpirun noticed that process rank 0 with PID 27921 on node dfmserver exited on signal 11 (Segmentation fault).
--------------------------------------------------------------------------

What could be the reason for OF not stopping when I put "writeNow" in the controldict file?

Code:

application     pimpleFoam;



startFrom       startTime;



startTime       0;



stopAt          writeNow;



endTime         100;



deltaT          0.002059;



writeControl    timeStep;



writeInterval   1000;

Thanks for any suggestions.

Code:

runTimeModifiable yes;

in the controldict file solved my problem.

just push ctrl+z

Quote:

Originally Posted by deji (Post 234738)

evening everyone. does anyone know the command to stop an openfoam simulation/

Greetings to all!

Quote:

Originally Posted by niaz (Post 371503)

just push ctrl+z

Uhm... that only suspends the execution. Running:

Code:

fg

#or

bg

The first one will unfreeze to the foreground and the second one unfreezes to the background.

For more, search online for:

Code:

linux job control

Oh, and it's Ctrl+C that breaks/terminates an application currently running on a terminal.

Last but not least, nowadays the official OpenFOAM version has a helper script named foamEndJob. For more:

Code:

foamEndJob -help

Best regards,
Bruno

Hello, what if i want to stop a process without losing saved data and then restart it from where i stopped it?

Greetings Meltedbrain,

Like I wrote on the previous post, the command foamEndJob can assist you with stopping it.

As for restarting... you can see on the user guide, section 4.3 Time and data input/output control:

Quote:

startFrom -> Controls the start time of the simulation.

Have fun!
Bruno

Thank you sir,
so maybe i should set starfFrom:latestTime, right?

Quote:

Originally Posted by Meltedbrain (Post 382487)

Thank you sir,
so maybe i should set starfFrom:latestTime, right?

That's what I read - did you try it?

OF rereads the controlDict after every cycle of the solver, I believe, so dynamic changes can be made there.