Philosophically, CFD is nothing but calculating and obtaining numerical solution for a fluid flow. Now, Technically, what do i mean by that? Fluids are governed by set of equations. The physics of the fluids are governed or has inherent physical laws, without these laws of physics of the fluids it is impossible to put the fluids to any use and gain insight and foresight. These equations are a s et of non linear, PDE, that captures the dynamics behind fluid flow. Now, how to compute and drive the answers? There are majorly two different types of methods. They are Finite Volume & Finite Difference.