Mechanical APDL Basic Analysis Guide - Ansys

Chapter 3: Using the Function Tool
• Rotational speed (OMEGS) (rotational speed for SURF151 or SURF152 elements)
• Rotational speed (OMEGF) (rotational speed for FLUID116 elements)
• Slip factor (SLIP) (slip factor for FLUID116 elements)
• Tabular data as a function of frequency of excitation (FREQ)
• Relative displacement (DJU)
• Relative velocity (DJV)
3.2.2. Creating a Function with the Function Editor
Access the Function Editor via the ANSYS GUI in either of the following ways:
• Main Menu> Solution> Define Loads> Apply> Functions> Define/Edit
• Utility Menu> Parameters> Functions> Define/Edit
Follow these steps to create a function:
1. Select the function type. Select either a single equation or a multivalued function. If you select the
latter, you must type in the name of your regime variable. This is the variable that governs the equations
in the function. When you select a multivalued function, the six regime tabs become active.
2. Select degrees or radians. This setting determines only how the equation is evaluated and has no effect
on *AFUN settings.
3. Define the result equation (if a single equation) or the equation describing the regime variable (if a
multivalued function) using primary variables, equation variables, and the keypad. If you are defining
a single-equation function, go to Step 10 to comment and save the equation. If you are defining a
multivalued function, continue with Step 5.
4. Click on the Regime 1 tab. Type in the appropriate lower and upper limits for the regime variable you
defined under the Function tab.
5. Define the equation for this regime.
6. Click on the Regime 2 tab. Notice that the lower limit for the regime variable is already defined and
unchangeable. This feature ensures that the regimes remain continuous, with no gaps. Define the
upper limit for this regime.
7. Define the equation for this regime.
8. Continue this process for up to six regimes. You do not have to store or save the individual equations
in each regime, unless you wish to reuse the equation in another regime.
9. Optional: Enter a comment to describe the function. Select Editor> Comment and type your comment
in the area provided.
10. Save the function. Select Editor> Save and type in a name. The filename must have a .func extension.
3.2.3. Using Your Function
After you have defined and saved your function, you can use it in any applicable ANSYS analysis, and any
other ANSYS user with access to the file can use it. For example, you could create a corporate library of
functions and place them in a common directory that all users can access via a network.
To use the function, you must load it, assign values to any equation variables, and provide a table parameter
name for use in a given analysis. Functions are stored in a table array in equation format, not as discrete
table values. All of these tasks occur via the Function Loader.
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