Computational Fluid Dynamics (CFD) is the process of mathematically modeling a physical phenomenon involving fluid flow and solving it numerically using the computational process. It is a science that produces quantitative predictions of fluid-flow phenomena based on the conservation laws (conservation of mass, momentum, and energy) governing fluid motion. Computational fluid dynamics is based on the Navier-Stokes equations. These equations describe how the velocity, pressure, temperature, and density of a moving fluid are related. A mathematical model varies in accordance with the content of the problem such as heat transfer, mass transfer, phase change, chemical reaction, etc. Moreover, the reliability of a CFD analysis highly depends on the whole structure of the process. Marine computational fluid dynamics gives the opportunity to investigate ship behavior digitally. This opens the way to predict ship performance at full scale and under realistic operating conditions. Advances in high-speed computing have benefited the field of computational fluid dynamics. Ship designers can also analyze complex fluid flow behavior by computer. These improved computational fluid dynamics techniques are revolutionizing the ship design process and enabling better designs to be produced more quickly.