### 3.2.3. Velocity Type

The velocity type can be set to `Cartesian` or `Cylindrical`: There are some important considerations to note with respect to the way that coordinate frame types affect velocity types:

#### 3.2.3.1. Cartesian Coordinate Frame, Cartesian Velocity Components

The `Cartesian Velocity Components` are applied relative to the Cartesian coordinate frame selected for initialization.

#### 3.2.3.2. Cartesian Coordinate Frame, Cylindrical Velocity Components

A local axis is required, which overrides the definition of the Cartesian coordinate frame chosen for initialization. The location of theta = 0 is not important, so only the axis is required to define the cylindrical coordinate frame.

#### 3.2.3.3. Cylindrical Coordinate Frame, Cartesian Velocity Components

The specified Cartesian velocity components X, Y and Z are applied in the cylindrical coordinate frame directions for r, theta and Z, respectively.

#### 3.2.3.4. Cylindrical Coordinate Frame, Cylindrical Velocity Components

A local axis is required, which overrides the definition of the cylindrical coordinate frame chosen for initialization. The location of theta = 0 is not important so only the axis is required to define the cylindrical coordinate frame.

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