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This Element addresses the aerodynamics, aeroelasticity, geometry, stability and dynamics of flexible flapping wings in the insect flight regime. It highlights distinct features and issues related to wing-wing interactions, contrast aerodynamic stability between rigid and flexible wings and the implications of wing aspect ratio.
Gas-particle flows became relevant in Aerospace Engineering owing to small solid particle additives to alleviate acoustical instabilities in solid propellant rocket motors, thereby motivating the study of a variety of nonlinear and linear waves. Emphasis is placed on fundamental aspects of the relaxation nature of the flow processes.
A unified computational fluid dynamics framework from rarefied to continuum regime is presented in this Element. This framework is based on the direct modelling of flow physics in a discretized space. The mesh size and time step are used as modelling scales in the construction of discretized governing equations.