D'Alembert's Paradox and the Momentum Theorem are irrefutable arguments that the forces on a body steadily translating through an infinite invisid fluid are zero. However, these principles do not apply if the motion of the body involves unsteady components. In fact, it has been well established theoretically that net steady thrust, or drag, can result from nonlinear filtering in the products of unsteady body surface displacement and pressure distributions involved in the force itegrals. The efficiency of such propulsion is necessarily 100 percent since no losses occur in an inviscid fluid. Further, no wake is left downstream since, for an invisid fluid, vorticity and circulation are identically zero everywhere at all time. The interest of this work is to seek and understand the mechanisms responsible for propulsion in an ideal fluid for possible employment in real fluid applications. This would be as a replacement, in concept, for the usual propulsion hydrodynamic processes employing circulation, and reduction of the induced drag and vortex wake signature inherent with those processes. Specifically, a 2-dimensional strip executing anguilliform traveling wave oscillations characteristic of the swimming of serpentine animals is analysed.

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