##### Fan
 The fan object is used in fluid simulations. It generates a fluid environment and produces a flow with the following controls: Turbulence: Amount of turbulence in the flow. If turbulence is zero, the flow has the same constant direction everywhere. Radius: The radius of the fan object. Radial falloff below uses the radius.

Radial falloff: This setting defines how the flow reduces away from the fan axis.

• Constant - The flow does not depend on the distance from the axis.

• Linear - The flow decreases to zero at the outer fan edge at a constant speed.

• Quadric - The flow speed is defined by a 2nd order parabola: speed = k*d*d, where d is distance from the outer edge towards the axis. This kind of flow appears in real world water pipes.

Axis falloff: Defines how rapidly the flow decreases in the direction of the fan axis. The falloff is symmetric in front of and behind the fan.

• Constant - The flow does not depend on the distance measured along the fan axis.

• Linear - The flow is inversely proportional to the distance: flow = maxflow/(c+k*distance)

Note The actual flow speed and other fluid properties can be defined from the Physics tab of the property window.