Computational Fluid Dynamics (CFD) is a branch of engineering analysis that focuses on analyzing problems that influence fluid flows. CFD is the computer-based simulation of flow motion problems, providing approximate solutions to fluid flow problems using computers and numerical algorithms. CFD is used to analyze complex problems involving fluid-fluid, fluid-solid, or fluid-gas interaction. It is applied to a wide range of research and engineering problems in many fields of study and industries, including aerodynamics and aerospace analysis, hypersonics, weather simulation, natural science and environmental engineering, industrial system design and analysis, biological engineering, fluid flows and heat transfer, engine and combustion analysis, and visual effects for film and games.

CFD analyses have a great potential to save time in the design process and are therefore cheaper and faster compared to conventional testing for data acquisition. Furthermore, in real-life tests, a limited amount of quantities is measured at a time, while in a CFD analysis, all desired quantities can be measured at once, and with a high resolution in space and time. CFD is an essential simulation tool but fraught with many pitfalls for new users. Some best practices can help these newcomers manage errors.