Titlebook: Elements of hydrodynamicp propulsion; J. A. Sparenberg Book 1984 Martinus Nijhoff Publishers, The Hague 1984 Profil.actuator.display.distr

Inelasticity

闖入

dissolution

HEW

Hypomania

The actuator surface,onfine ourselves to a more restricted definition. We will use the term actuator surface for a two dimensional region in a fluid on which an external force field is concentrated. At this surface we have to admit a possible discontinuity of the pressure or of the tangential component of the velocity field or of both.

adroit

insular

CHART

Book 1984eglected with respect to these velocities themselves. Hence it is necessary to evaluate the domain of validity of the results with respect to these two a priori assumptions. Anyhow it seems advisable to have first a good understanding of the linearized non-viscous theory before embarking on complica

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Unsteady propulsion,al unsteady propulsion occurs in the case of the Voith-Schneider propeller (section 4.7), contra rotating propellers, the propulsion wheels of a paddle boat and the sculling by means of an oar. In nature almost all animal propulsion in water or in air is unsteady, the flapping motion of the tail of