Does OpenFOAM has the function
Does OpenFOAM has the functionality to calculate the center of mass for a complex geometry? If yes, how to do that? If no, is it possible to implement it, using the libraries of OpenFOAM?

Try:
vector c = sum(mesh.V(
Try:
vector c = sum(mesh.V()*mesh.C().internalField())/sum(mesh.V()); You will, of course, need a mesh for your geometry. Enjoy, Hrv 
how to use this code???
can You guide me how to calculate centre of poressure???? can you tell me how to use it as i am new in openfoam vector c = sum(mesh.V()*mesh.C().internalField())/sum(mesh.V());

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