This paper presents an experimental study on the unsteady pressure loading for two circular cylinders in tandem arrangement Reynolds number subcritical regime. Experiments were conducted heavily instrumented cylinders, each with multiple static and dynamic sensor devices positioned at various peripheral spanwise locations, enabling extensive surface pressure, coherence, turbulence length-scale ...

Buffeting is an aeroelastic phenomenon which plagues high performance aircraft at high angles of attack. For the F/A-18 at high angles of attack, vortices emanating from wing/fuselage leading edge extensions burst, immersing the vertical tails in their turbulent wake. The resulting buffeting of the vertical tails is a concern from fatigue and inspection points of view. Previous flight and wind-...

The work develops a high-accuracy viscous analysis of nonlinear aeroelastic interaction of a Micro Air Vehicle’s (MAV) wing section with a non-uniform, unsteady upstream flow. In the implemented iterative procedure, a set of governing Navier-Stokes equations is solved simultaneously with nonlinear equations of motion of the structure, so that the fluid and structure are treated as a coupled dyn...

Both kinematics and morphology are critical determinants of performance in flapping flight. However, the functional consequences of changes in these traits are not yet well understood. Traditional aerodynamic studies of planform wing shape have suggested that high-aspect-ratio wings generate more force per area and perform more efficiently than low-aspect-ratio wings, but these analyses may neg...

We present a new local-in-time discrete adjoint-based methodology for solving design optimization problems arising in unsteady aerodynamic applications. The new methodology circumvents storage requirements associated with the straightforward implementation of a global adjoint-based optimization method that stores the entire flow solution history for all time levels. This storage cost may quickl...

Three-dimensional unsteady computations of the flow past a fruit fly Drosophila under hovering and free flight conditions are computed. The kinematics of the wings and the body of the fruit fly are prescribed from experimental observations. The computed unsteady lift and thrust forces are validated with experimental results and are in excellent agreement. The unsteady aerodynamic origin of the ...