How to average the value in a certain region in OpenFOAM?

6863523 · January 18, 2018, 04:51

Dear all,
I have run the simulations and caculate the volume averaged values over the whole domain in OF 4.0.1.
I wonder if there is a way to calculate the averaged value over only a part of the domain instead of the whole domain.
It seems that I need to separate the mesh first before I ran the simulations and average only in the needed region instead averaging over "all".

Code:

    volumeAverage
    {
        type            volRegion;
        libs            ("libfieldFunctionObjects.so");
        log             false;
        writeControl    timeStep;
        writeInterval   20000;
        writeFields     false;
        regionType      all;
        operation       volAverage;
        fields
        (
            U
        );
    }

If this is the case, how to separate the mesh but still run the simulation in the whole region?
Thanks in advance.
Best regards,
Bill

alexeym · January 18, 2018, 05:07

Hi,

Instead of all you set regionType to cellZone and create cellZone, where you would like to calculate volume average, with topoSet utility. See $FOAM_SRC/functionObjects/field/fieldValues/volFieldValue/volFieldValue.H for more details.

January 18, 2018, 04:51	How to average the value in a certain region in OpenFOAM?	#1
6863523 Senior Member Bill Wang Join Date: Aug 2014 Posts: 109 Rep Power: 11	Dear all, I have run the simulations and caculate the volume averaged values over the whole domain in OF 4.0.1. I wonder if there is a way to calculate the averaged value over only a part of the domain instead of the whole domain. It seems that I need to separate the mesh first before I ran the simulations and average only in the needed region instead averaging over "all". Code: volumeAverage { type volRegion; libs ("libfieldFunctionObjects.so"); log false; writeControl timeStep; writeInterval 20000; writeFields false; regionType all; operation volAverage; fields ( U ); } If this is the case, how to separate the mesh but still run the simulation in the whole region? Thanks in advance. Best regards, Bill

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January 18, 2018, 05:07		#2
alexeym Senior Member Alexey Matveichev Join Date: Aug 2011 Location: Nancy, France Posts: 1,930 Rep Power: 38	Hi, Instead of all you set regionType to cellZone and create cellZone, where you would like to calculate volume average, with topoSet utility. See $FOAM_SRC/functionObjects/field/fieldValues/volFieldValue/volFieldValue.H for more details.