[machao]

Dear Foamers

I'm doing the simulation of the flow over a circular cylinder.I want to get the mean-flow skin-friction coefficient.I try to use the fieldAverage function.This function can help me get Umean and Pmean.However it doesn't work to get wallShearStressmean.The file isn't created in time folders.How can I get wallShearStressmean on run-time?My OF version is 5.0.

I'm appreciate for anyone who can help me.

[tomf]

Hi,

It works if you first define the wallShearStress functionObject in the controlDict and than the average. Just make sure you execute wallShearStress every iteration/timestep:

    wallShearStress
    {
        type            wallShearStress;
        libs            ("libfieldFunctionObjects.so");

        executeControl  timeStep;
        writeControl    writeTime;
    }    
    fieldAverage
    {
        type                fieldAverage;
        writeControl        writeTime;
        timeStart           2500;
        fields
        (
            U
            {
                mean        on;
                prime2Mean  off;
                base        time;
            }
            wallShearStress
            {   
                mean        on;
                prime2Mean  off;
                base        time;
            }
        );
        functionObjectLibs  ("libfieldFunctionObjects.so");
    }

Cheers,
Tom