Computational fluid dynamics (CFD) software is an important part of building and analyzing a flow model. They are used to calculate flow parameters for fluids, and in the design and simulation of fluids, and are also used to simulate fluid mechanics.

Computational fluid dynamics software uses Navier-Stokes equations (changes in momentum in infinitesimal volume of fluid are simply the sum of dissipative viscous forces, changes in pressure, gravity, and other forces acting inside the fluid), differential notational that governs the motion of fluids.