About FEM methods
hi,
I want to know why Finite difference schemes are mostly preferred when numerically simulating fluid dynamics instead of using Finite Element Methods(FEM). Is it computationally expensive to use a discretization schema like FEM due to their large number of discrete element requirements ? 
Hi batabek,
To start with, the most common practice in CFD is the Finite Volume Method (FVM) rather than the Finite Difference Method. The reasons the Finite Element Method (FEM) is less common in CFD, in my view are mainly two:
Rami 
yeah volume preservation is a good point to consider, specifically in the incompressible flow. But I have not known FVM is dominant in the field until you said so. I thought FDM is more easy to implement in a computer.

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