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GeometricFieldFunctions: gmax, gmin double reduction
In GeometricFieldFunctions.C
Foam::func(gFunc(gf.primitiveField()), gFunc(gf.boundaryField())) \
i.e. it does
max(reduce(max(internalField)), reduce(max(boundaryField)))
Better should be
reduce(max(max(internalField), max(boundaryField)))