Relative velocity

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 the velocity with which a body approaches or recedes from another body, whether both are moving or only one.

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
It can be seen from the Figure 4, that the region near the closed valve is subject to a strong cavitation, accompanied by a decrease in pressure and an increase of the relative velocity between the phases.
Based on the velocity triangle, the relative velocity of the fluid was determined when it tangentially passes by the blades at the impeller inlet and outlet.
In the present work, we shall use a Coulomb model where the slip force does not depend on the relative velocity, and it is equal to the limit value [T.sub.sMax].
For this reason, Helbing and Tilch proposed an extended model considering the headway and the velocity of the following car and the relative velocity between the preceding vehicle and the following vehicle when the following vehicle was faster than the preceding vehicle (19).
(iv) The calculation of the relative velocity between phases with (9).
From Figures 9 and 10, the relative velocity of cross section in the impeller channel flows along the blade profile direction, the relative velocity of fluid from the center of the impeller to the edge of the impeller is gradually increased, the change of gradient is relatively flat, and there is no obvious "jet-wake" flow structure.
The maximum control input [u.sub.max] is set to [u.sub.max] = 0.1 m/[s.sup.2], and the maximum relative velocity [v.sub.max] is set to [v.sub.max] = (0.5,0.5,0.5,0.5,0.5,0.5)T m/s.
and its time derivative is relative velocity (11b).
In the action point model firstly developed by Michaels , drivers perceived relative velocity according to the changes on the visual angle subtended by the lead vehicle.
since in the frame of the rotating clocks they have no relative velocity wrt each other.

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