CFX Expression Language–Part 3: Applying Boundary Conditions Using CEL

By: Ted Harris
– April 19, 2013
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In two previous entries we introduced CFX Expression Language, CEL:

Part 1: Accessing CFD Simulation Information in CFX (and FLUENT)

Part 2: Augmenting Material Property Assignments in ANSYS CFX

In this third installment we will see how to use CEL to apply boundary conditions as equations rather than constant values. For example, if a non-constant velocity profile can be defined as an equation, we can use CEL to define as well as apply the profile.

Let’s look at an example in which the velocity profile is a function of y coordinate:

u(y) = 6 * Umax * y / H * (1 – y/H) (m/s)

Using the procedure we learned in part 1 of this series, in CFX Pre we have defined expressions for H and Umax. We then defined the equation for the velocity profile as Uprofile:

clip_image002

Next we go to the Plot tab within the Expressions editor to verify that our velocity profile matches expectations:

clip_image004

To use our new expression in CFX Pre, we just enter the expression name in the appropriate field when defining the inlet velocity:

clip_image006

Finally, this velocity plot from CFD Post shows that indeed our desired velocity profile was applied at the inlet.

clip_image008

Hopefully this demonstrates how easy it can be to use CFX Expressions to define non-constant boundary conditions. In the next part of the series, we will look at using expressions to ramp or step apply loads.

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