Results 211 to 220 of about 1,275 (262)
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2015
This chapter details the various methods of deriving an unsteady aerodynamic model for aeroservoelastic analysis. This usually takes the form of a linear operational relationship between pressure distribution and upwash distribution on a lifting surface for subsonic and supersonic flows, and a nonlinear partial differential equation (Euler, full ...
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This chapter details the various methods of deriving an unsteady aerodynamic model for aeroservoelastic analysis. This usually takes the form of a linear operational relationship between pressure distribution and upwash distribution on a lifting surface for subsonic and supersonic flows, and a nonlinear partial differential equation (Euler, full ...
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Unsteady interactional aerodynamics of a helicopter configuration
Il Nuovo Cimento C, 2009In this paper we present the aerodynamic simulation of a complex rotor/fuselage configuration performed with the CFD solver ROSITA (ROtorcraft Software ITAly), developed at the Aerospace Department of the Politecnico di Milano.
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1993
This paper reviews recent advances in the theoretical and computational modeling of turbomachinery unsteady flows. In particular, the unsteady aerodynamic analyses intended for aeroelastic and aeroacoustic predictions must be applicable over wide ranges of operating conditions and modes of unsteady excitation.
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This paper reviews recent advances in the theoretical and computational modeling of turbomachinery unsteady flows. In particular, the unsteady aerodynamic analyses intended for aeroelastic and aeroacoustic predictions must be applicable over wide ranges of operating conditions and modes of unsteady excitation.
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The Mean Power of Forces and Moments in Unsteady Aerodynamics
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 1992AbstractThe balance of mechanical energy serves as the starting point for a unified and consistent approach to the two basic and inherent mechanisms in unsteady aerodynamics, propulsion and flutter. Both phenomena are mutually dependent and interchangeable with each other by a mere variation of the reduced frequency as the governing magnitude with ...
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Studies in Non-Linear Unsteady Aerodynamics
1986Abstract : A research program in non-linear unsteady aerodynamics is summarized. New computational and theoretical methods ideally suited for viscous unsteady aerodynamic problems are described. Improved understanding of important physical processes involved in non-linear unsteady aerodynamics are discussed.
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Unsteady aerodynamics: retrospect and prospect
The Aeronautical Journal, 1999AbstractThis paper reviews some current problems in unsteady aerodynamics and discusses some future challenges. The emphasis is on problems associated with separated flows, such as buffeting and limit cycle oscillations. Suggestions are made to indicate how experimental facilities (such as cryogenic windtunnels) and computational fluid dynamics might ...
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Reduced-Order Models for Nonlinear Unsteady Aerodynamics
AIAA Journal, 2000Two reduced-order modeling approaches for the evaluation of nonlinear aerodynamic forces based on CFD computations are presented. These reducedorder models (ROMs) provide a means for rapid calculation of frequency-domain generalized aerodynamic forces, which can be used in traditional flutter analysis scheme, to calculate flutter characteristics about ...
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Control of Unsteady Aerodynamic Forces
1990Abstract : The aerodynamic properties of an airfoil under unsteady conditions are very different from ones in steady conditions because the vortex generated by unsteady separation greatly modifies the loading on the wing. In this study, a fundamental approach was taken to investigate the lift and the velocity field of unsteady airfoils.
Mario Lee +4 more
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The role of unsteady aerodynamics in aeroacoustics
1st National Fluid Dynamics Conference, 1988The role of acoustics and unsteady aerodynamics research in understanding the fundamental physics of time-dependent fluid phenomena is reviewed. The key issues are illustrated by considering the sound radiation of turbulent jets and the aeroacoustics of rotating bodies such as helicopter rotors. The importance of computational methods as a link between
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