[andrewpomeroy]

It is possible to use multiple instances of fieldAverage in controlDict but for the same variable?



What I am trying to achieve is a timeaverage for velocity U over two different periods (i.e., every 0.1 s and much longer over the whole LES simulation 40 s).


I seems that openFoam will allow two functions to be included but when I post-process the data in Paraview only one Umean variable is created. Is there some work-around or trick to specify two mean variables based on the same source variable?



This is what I'm trying to achieve:

functions
{
    fieldAverage1
    {
        type            fieldAverage;
        functionObjectLibs ("libfieldFunctionObjects.so");
        enabled         true;
        writeControl   runTime;
        writeInterval 0.1;

        fields
        (
            U
            {
                mean        on;
                prime2Mean  on;
                base        time;
            }

            p
            {
                mean        on;
                prime2Mean  on;
                base        time;
            }
        
        );
    }  

fieldAverage2
    {
        type            fieldAverage;
        functionObjectLibs ("libfieldFunctionObjects.so");
        enabled            true;
        writeControl       runTime;
    writeInterval     100;
    timeStart    60;
    timeEnd        100;

        fields
        (
            U
            {
                mean        on;
                prime2Mean  off;
                base        time;
            }        
        );
     }

[tomf]

Hi,

You might have some success by using windows as seen on the online documentation.

I just copied from there this part as an example to be filled in. Maybe test an a small case first:

        <field name 1>
        {
            mean        <yes|no>;
            prime2Mean  <yes|no>;
            base        <time|iteration>;
            windowType   exact;
            window       10.0;
            windowName   <name>;
            allowRestart true;
        }

Good luck,
Tom

[andrewpomeroy]

Hi Tomf,
Yes that worked out for me. I found I had to specify a windowName but it does work.

Thanks.