Definition

Computations Fluid Dynamics is a method of determining and illustrating:

•	Velocities, temperatures, and directions of airflow, migration of particles and chemicals
•	CFD methods use the Navier-Stokes equations to describe flow characteristics based on the conservation of mass, momentum, and energy.

Method

A CFD analysis applies the Navier-Stokes equation to an environment space by:

•	Step 1: Dividing a three-dimensional space into a set of many cubes
•	Step 2: Describing flow characteristics of each "cube" in mathematical terms
•	Step 3: Reassembling the matrix of cubes and calculating their complex interactions to approximate the overall behavior of the environment

Types of CFD Output

CAES provides clear illustrations of your environment's airflow characteristics. The output allows you to visualize the airflow at virtually any view or angle.

Velocity Vectors

•	Arrows indicating the direction of air movement. The output is both color and length coded to denote magnitude.

Streak lines and Particle Tracks
(particles without mass or with mass)

•	Lines depicting the trails left behind by imaginary, moving particles that have either no mass or have a defined mass. Colors can indicate dewll time, identity, temperature, turbulence, etc.

Iso-Surfaces

Three-dimensional surfaces in space that define a single magnitude of variable such as speed, concentration, particulate loading, or temperature.
•	Three-dimensional surfaces in space that define a single magnitude of variable such as speed, concentration, particulate loading, or temperature.

Profiles

•	Color contours projected away from a surface along a reference vector by an amount proportional to the value of the plotted variable at each point on the surface.