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Computational fluid dynamics is simulation and analysis performed in computer-aided design (CAD) software to calculate the flow of liquids or gases in or around a product.

It is a multiphysics solution since it involves the interaction of multiple phenomena including fluid dynamics, thermodynamics, and conservation of momentum. Like finite element analysis (FEA), the fluid volume is broken up into smaller elements that are composed into a matrix. CFD has many uses beyond product development and aerodynamics, such as weather forecasting and visual effects.