In a previous paper, we addressed the problem of choosing constant values of altitude, speed, and angle of attack such that the orbital plane change during hypersonic flight is maximized for a fixed amount of propellant consumption. In the present paper, the restrictions of constant speed and angle of attack are removed. Necessary conditions for solutions to the resulting optimal control proble...

The downstroke-to-upstroke transition of many insects is characterized by rapid wing rotation. The aerodynamic consequences of these rapid changes in angle of attack have been investigated using a mechanical model dynamically scaled to the Reynolds number appropriate for the flight of small insects such as Drosophila. Several kinematic parameters of the wing flip were examined, including the sp...

A hydrofoil turbine with simultaneous heaving and pitching is found to have an ability achieve a high power extraction. An OpenFOAM-based numerical model combined non-conformal sliding interface employed study the extraction efficiency of two-dimensional single hydrofoil. The developed validated published experimental results. For Re = 500,000, energy efficiencies are mapped in frequency amplit...

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