1 Numerical Simulation of Parafoil Aerodynamics and Dynamic Behavior

Autonomously operating parafoil systems are considered as adequate means to precisely deliver aerial cargo to almost everywhere on ground. Thus, development work has started and is ongoing globally and first generation systems are already fielded. From a system design point of view, a sound understanding of the parafoil aerodynamic and dynamic behavior is needed to support the overall design process. The present paper aims on identifying the parafoil's specific aerodynamic and dynamic characteristics applying pure numerical methods. Where possible, analytical results are compared to experimental data. Nomenclature A = reference point w.r.t. aerodynamic forces α = angle of attack B = reference point w.r.t. buoyancy forces C = coupling point CARP = computed air release point CDi = induced drag coefficient CDp = non-induced drag coefficient CD = drag coefficient CL = lift coefficient Cm = pitching moment coefficient Cp = pressure coefficient δ = trailing edge deflection DL = line drag DP = payload drag FA = aerodynamic force FB = buoyancy force GP = payload gravity force GW = wing gravity force MA = aerodynamic moment P = payload center of gravity θP = payload pitch attitude Vd = downward velocity Vh = horizontal velocity W = wing center of gravity I