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OpenFoam: time averaging velocity of a URANS Simulation

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Old   August 21, 2019, 08:46
Default OpenFoam: time averaging velocity of a URANS Simulation
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Andrei
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Hi there,

I'm running a pipe simulation with pimpleFoam and after the simulation I would like to average the velocity in the whole field on a specific segment of time.

I know I could just use simpleFoam but the solution doesn't converge with simpleFoam. So I want to simulate with PimpleFoam check the periodicity of the Simulation and average the velocity in that period in order to get a similar result to a RANS simulation.

Can anybody help me?

Thank you
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Old   August 22, 2019, 09:40
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Evren Linda
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Try to use fieldAverage function object.
Here is an example:

Code:
fieldAverage1
    {
        type                fieldAverage;
        libs                ("libfieldFunctionObjects.so");

        writeControl    writeTime;

        restartOnRestart    false;
        restartOnOutput     false;
        periodicRestart     false;
        restartPeriod       0.002;

        fields
        (
            U
            {
                mean            on;
                prime2Mean      on;
                base            time;
                window          10.0;
                windowName      w1;
            }
            p
            {
                mean            on;
                prime2Mean      on;
                base            time;
            }
        );
    }
for more examples from tutorials, try:

Code:
grep -R "fieldAverage" $FOAM_TUTORIALS
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average velocity, pimplefoam, rans, simplefoam; convergence;, urans

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