Computational Fluid Dynamics (CFD) is a computational technology
that enables you to study the dynamics of things that flow. Using CFD, you build
a computational model that represents a system or device that you want to study.
Then you apply the fluid flow physics to this virtual prototype, and the
software outputs a prediction of the fluid dynamics. CFD is a sophisticated
analysis technique. It not only predicts fluid flow behavior, but also the
transfer of heat, mass (such as in perspiration or dissolution), phase change
(such as in freezing or boiling), chemical reaction (such as combustion),
mechanical movement (such as an impeller turning), and stress or deformation of
related solid structures (such as a mast bending in the wind).
Finite Element Analysis (FEA) is a computational/mathematical
technique for analyzing stress, which breaks down a physical structure into
substructures called "finite elements." The finite elements and their
interrelationships are converted into equation form and solved mathematically.
Graphics-based FEA software can display the model on screen as it is being built
and, after analysis, display the object's reactions under load conditions.
Models created in popular CAD packages can often be accepted by FEA software.
System simulation is a computational technique for analyzing engineering
systems which can be described by mathematical models or equations. From
electric systems, mechanical system as well as thermal systems, to powertrain,
driveline and other control devices, system simulation software can integrated
various cross-physics and cross-application models into a complete system for
further numerical investigation and simulation.