Using long-time sampling data, several wingbeat cycles have been analyzed in order to cover both the downstroke and upstroke phases. Both approaches are presented over the duration of wingbeat cycles. The unsteady lift is comprised of circulatory and non-circulatory components. The aerodynamic forces are obtained through two approaches, the unsteady thin airfoil theory and using the momentum equation for viscous flows. The current study deals with the estimation of unsteady aerodynamic forces on a freely flying bird through analysis of wingbeat kinematics and near wake flow measurements using time resolved particle image velocimetry. Both aerodynamicists and biologists have attempted to address this subject, yet it seems that the contribution of unsteady lift still holds many open questions. We study the role of unsteady lift in the context of flapping wing bird flight.
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