pressureAverageOnTriSurface_left //name of the folder where .dat is saved
        {
            name            left;   //dumb entry ??
            
            type            surfaceFieldValue;
            libs            ("libfieldFunctionObjects.so");
            writeControl    timeStep;
            writeInterval   1;
            writeFields     false;  //write folder at each write interval
            log             true;
            
            operation       average; //banana
            fields          (p); //banana
            regionType      sampledSurface; //banana
            surfaceFormat   stl; //banana

            sampledSurfaceDict
            {
                type        sampledTriSurfaceMesh;
                surface     left.stl;
                source      cells; //banana
                interpolate true;
            }
        }