Wind-US User's Guide - Keyword Reference, ROTATE

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ROTATE - Perform calculation in a rotating frame of reference

ROTATE x_cntr y_cntr z_cntr Ω_x Ω_y Ω_z

The ROTATE keyword allows the user to compute the flow in a rotating reference frame. The center of rotation and rotation rates are specified via the arguments:

x_cntr, y_cntr, z_cntr Center of rotation, in grid units.
Ω_x, Ω_y, Ω_z Rotation rates about the three Cartesian coordinate axes, in degrees/sec. (Note: prior to Wind-US 2.184 these were in radians per second. Input data files using this keyword with earlier versions of Wind-US will need to be changed if used with Wind-US 2.184 or later.)

Note that a similar capability is given by the ROLL keyword, in which the grid is rotated about an axis. However, ROLL does the calculation in inertial space, and uses the grid velocity to impart a rotating component. Unfortunately, unless ROLL is run in a true time-accurate mode which moves the grid each time step (not currently available), as well as giving it velocity, the ROLL capability neglects the rotational potential energy, and so is not correct for high rotation rates.

This keyword cannot be used with the Van Leer differencing scheme (RHS VANLEER).

See Also: REL-ROT-ZONE, ROLL, ARBITRARY INFLOW

	x_cntr, y_cntr, z_cntr		Center of rotation, in grid units.
	Ω_x, Ω_y, Ω_z		Rotation rates about the three Cartesian coordinate axes, in degrees/sec. (Note: prior to Wind-US 2.184 these were in radians per second. Input data files using this keyword with earlier versions of Wind-US will need to be changed if used with Wind-US 2.184 or later.)