This is a packaged function object that conveniently computes averages
of fields on tri-surfaces. It can be executed on the command line as
follows:
foamPostProcess -func "triSurfaceAverage(name=mid.obj, p)"
This will compute the average of the field "p" on a surface file in
"constant/geometry/mid.obj".
The calculation could also be done at run-time by adding the following
entry to the functions section of the system/controlDict
#includeFunc triSurfaceAverage(name=mid.obj, p)
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