### 3.2.1. Coordinate Frame

When using domain initialization, you can optionally select a reference coordinate frame other than the default `Coord 0` frame in which to have the solver interpret your initialization values. If a coordinate frame is not specified, the domain coordinate frame is used (although it may be overridden, as described below). Any variables used in the specification of an initialization value are interpreted as follows:

- x, y, z

  local coordinate frame

- other variables

  global coordinate frame

You can select any predefined coordinate frame.

Information about making local coordinate frames is available in Coordinate Frames in the CFX-Pre User's Guide.

The coordinate frame used is local to initialization only and is used to interpret all x, y and z component values set on the Initialization panel.

Note: The coordinate frame set here may be ignored in some situations. For details, see Velocity Type.

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