WIND 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 Omega_x Omega_y Omega_z [zone_selector]

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

x_cntr, y_cntr, z_cntr Center of rotation, in grid units
Omega_x, Omega_y, Omega_z Rotation rates about the three Cartesian coordinate axes, in radians/sec

Note: 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.

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

	x_cntr, y_cntr, z_cntr		Center of rotation, in grid units
	Omega_x, Omega_y, Omega_z		Rotation rates about the three Cartesian coordinate axes, in radians/sec