Computational Fluid Dynamics (CFD) is the branch of the science of predicting fluid flow through conduits/channels, heat transfer in different modes, chemical reactions in reactors and related phenomena by solving the mathematical equations that govern these processes. CFD, also sometimes referred to as fluid flow simulation. The current book discussed the physical significance of the governing equations of the fluid flow and heat transfer and also analyze the study of the different techniques of fluid flow in different applications such as heat exchanger, condenser, evaporator, engine, etc. by using computational fluid dynamics.