One easy question. How to calc
 

One easy question. How to calculate volume average of a volScalarField? I think the average() is not the function I want. Can somebody tell me? Thanks!

That's the problem with easy q
 

That's the problem with easy questions. Nobody wants to answer them because you can only embarrass yourself by saying somthing stupid.

Nevertheless:

sum(mesh.V()*myField)/sum(mesh.V())

(weighted average of the cell-values)

volScalarField a = ...; a
 

volScalarField a = ...;

a.weightedAverage(mesh.V());


Hrv

so, what about surface average of a scalar field at specified boundary patch (like inlet)

how can I include that in my source code?