## Chapter 25: Coordinate Frames

By default, all quantities used in CFX-Pre are defined with reference to the global Cartesian coordinate frame. In some cases, it is useful to use a different coordinate frame for specifying boundary conditions, initial conditions, source components or spatially varying material properties. It is possible to specify one or more local coordinate frame objects to which you can then refer. This chapter describes the user interface for creating local coordinate frame objects. For details, see Coordinate Frames in the CFX-Solver Modeling Guide.

Local `Coordinate Frame` objects may be defined in terms of Cartesian coordinates. Here, the numbers 1, 2, 3 are used to denote the Cartesian X, Y, Z axes.

This chapter describes:

- Creating a New Coordinate Frame
- Coordinate Frame Basic Settings Tab

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