This is a post by Dave Martin on PTC site.
As a CAD administrator, I have been responsible for maintaining the connections between Creo Parametric and other software products. This included software for computational fluid dynamics (CFD).
This field of analysis is complex because it involves multiphysics, the combination of coupled processes for fluid motion and heat transfer (thermodynamics). CFD can involve compressible and incompressible fluids and both laminar and turbulent flows. It is one of the more advanced areas of simulation and analysis.
Working in aerospace, CFD is an absolute necessity. When I worked on drones, we needed to analyze the flow of external air over the fuselage, airfoils, and propellers. In rocket development, you need to study the flow of the fuel and oxidizer fluids through pumps, chambers, and other components.