Hovering hinged plates are used to study the effects of passive deflection on aerodynamic performance using two-dimensional Direct Numerical Simulations (DNS) at low Reynolds numbers (Re). The hinge is modeled as a torsional spring at the leading edge, where the prescribed motion is applied. The influence of forced-to-natural frequency ratio (hinge stiffness) is studied, concluding that averaged glide ratio (lift-to-drag) improved as the hinge became stiffer, with a peak performance occurring for ω~f/ω_n = 1/4. The influences of stroke-to-chord ratio on a hovering hinged plate are also investigated, concluding that glide ratio improved as the ratio increased for the frequency ratio that we studied.
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