## Chapter 29: Expressions

The Expressions workspace is used to generate and edit expressions using the CFX Expression Language (CEL), which you can then use in CFX-Pre in place of almost any numeric value (as long as the correct units are returned by the expression).

Note: In an expression, a term that has no units can be added to a term that has angular units, in which case the software internally applies radians to the term that has no units.

Note: CFX-Pre evaluates CEL expressions with single (not double) precision.

Important: There is some CEL that works in CFX-Pre and CFX-Solver, but not in CFD-Post. Any expression created in CFX-Pre and used as a Design Exploration output parameter could potentially cause fatal errors during the Design Exploration run, so you should create all expressions for Design Exploration output parameters in CFD-Post.

This chapter describes:

- Expressions Workspace
- Creating an Expression
- Modifying an Expression
- Importing or Exporting an Expression

Release 18.2 - © ANSYS, Inc. All rights reserved.