[mgg]

Hallo everyone,

I got a problem of sampling surface. I am running a pipe flow with cyclic bc (DNS). When the flow is fully developed turbulent, I did a run-time surfacesampling of inlet. The sample function in the controlDict is as following described. The problem is that the number of sampled points/values (4846) does not match the number of actual faces of the patch (6400). This 4846 values are the results from 128 cores parallel computation. And with other core numbers, this number will also change. I also tried with 2 cores, then the number is 6400. My decompose methode is scotch. I also tried other methode, with simple the sampling function can not sample anything. Could anyone explain that?

        surfaceSampling
    {

        type surfaces;

        functionObjectLibs ("libsampling.so");
        enabled         true;
        outputControl timeStep;
        outputInterval 10;
        interpolationScheme cellPointFace; 

        surfaceFormat    foamFile;  
        fields
        (
            U
            
        );
        surfaces
        (
           inlet
          {
        type            patch;
        patches         ( inlet );
        interpolate     false;    
        triangulate     false;
          }
        );
    }
  }