To create a drag control object: Choose Get Force Drag from the Simulate toolbar, Get Primitive Control Object Drag from the other toolbars, or Create Force Drag from the Hair toolbar.
To redisplay this property editor: Select the drag object and press Enter.
The Drag forces opposes the motion of ICE particles, rigid bodies, or hair going through a fluid, and depends on the flow of the fluid around the object.
Drag has no effect on Soft body or Cloth simulations.
For more information on forces in general, see Forces [ Simulation and Effects].
To use this force in an ICE tree, see Creating and Applying ICE Forces to ICE Simulations [ICE Guide].
Length of the arrow is determined by the Amplitude value.
The basic drag force (Fd) formula is:
rf is the density of the fluid
A is the cross-sectional area of the object
v is the object velocity relative to the fluid velocity
Cd is not a constant but instead depends on the value of a dimensionless constant called the Reynold's number (R). R is a ratio between the inertial property of the fluid that is being pushed out of the way by the object and the viscous drag on the object.
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