# What is CFD - Computational Fluid Dynamics?

When an engineer is given the job of designing a new product, e.g. a fantastic race car for an additional season, aerodynamics play an important role in the engineering process. However, aerodynamic processes are not easily quantifiable during the concept phase. Usually the only way for your engineer to optimize his designs is always to conduct physical tests on product prototypes. With all the rise of computers and ever-growing computational power (because of Moore’s law!), the concept of scFLOW became a commonly applied tool for generating solutions for fluid flows with or without solid interaction. In the CFD analysis, the study of fluid flow according to its physical properties such as velocity, pressure, temperature, density and viscosity is conducted. To virtually generate an exact solution for any physical phenomenon related to fluid flow, those properties have to be considered simultaneously.

A mathematical type of the physical case plus a numerical method are utilized in a software tool to analyze the fluid flow. As an example, the Navier-Stokes (N-S) equations are specified because the mathematical model of the physical case. This describes modifications in all those physical properties for both fluid flow and also heat transfer. A mathematical model varies depending on the content with the problem for example heat transfer, mass transfer, phase change, chemical reaction, etc. Moreover, the reliability of a CFD analysis highly depends upon the whole structure of the process. The verification from the mathematical model is extremely important to create a precise case for solving the problem. Besides, the resolution of proper numerical methods is key to generate a reliable solution. The CFD analysis is really a key element in starting a sustainable product development process, because the number of physical prototypes may be reduced drastically.