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In the present paper, a concept design of biomimetic propulsor with two oscillating fins in series to enhance the horizontal mobility of an underwater glider without disturbing glide is proposed. The concept of the serial fins configuration in the propulsor comes from mimicking the mechanism of fish swimming, in which tail fin manipulates head-body generated vortex to form a Reverse Karmon Vortex...
Using a model rooted in Hamiltonian mechanics, we consider the self-propulsion of a deformable planar hydrofoil in an ideal fluid in the presence of ambient vorticity, and investigate the mechanism whereby the hydrofoil can harvest energy from the surrounding flow in order to improve its own energy efficiency. We demonstrate, in particular, that energy harvesting can be achieved via closed-loop control...
The horseshoe vortex is typical flow characteristic around the appendage-body junction. The horseshoe vortex formation around the hull-said junction has important influence on the submarine hydrodynamics performance. The origination process of the submarine horseshoe vertex and its influence on submarine flow is analyzed. The numerical simulation on the horseshoe vortex is carried out using DES method...
A novel method to compute the 3-D unsteady hydrodynamics with application to undersea vehicles is presented. This approach solves the vorticity equation, which is derived from the momentum equation of the Navier-Stokes equations. Most problems of Navy interest involve incompressible flow, that may be described in terms of the vorticity alone. Specific geometries are represented using surface source...
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