How to caculate cell volume
1 Could you please tell me of an articals or free books that explain how to caculate the cell volume with general shape.
2  is there free Algorithm on teh internet that will Calculate 3D cell volume. Thank you Tareq 
Re: How to caculate cell volume
if you are dealing with generalized curvilinear structural grids. It is quite simple, just the reciprocal of the grid Jacobian J = d(si, eta, gama)/d(x, y, z).

Re: How to caculate cell volume
You will find the formulation in the CFD book of Ferziger and Peric. In short, the definition is:
volume = SUM over f of (x_f Ax_f) where f is all the faces of a control volume x_f the x coordinate of the cell face centre Ax_f the x coordinate of the outward pointing face area vector. 
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