The Impact of Unsteady Aerodynamics on the Loading of Flight Vehicles
نویسنده
چکیده
Abstract. This paper describes the growing use of computational fluid dynamics (CFD) at the Lockheed Martin Aeronautics Company to assess and design for unsteady loads. The experience in development and in use of CFD for unsteady loads is presented in four sections: (1) background and motivation leading to the development of this capability, (2) an overview of the tools and processes utilized in disciplinary and multidisciplinary simulations, (3) a series of application and computational verification studies, and (4) a description of capabilities currently in development.
منابع مشابه
Improved Mathematical Model for Helicopters Flight Dynamics Applications
The purpose of this paper is concerned with the mathematical model development issues, necessary for a better prediction of dynamic responses of articulated rotor helicopters. The methodology is laid out based on mathematical model development for an articulated rotor helicopters, using the theories of aeroelastisity, finite element and the time domain compressible unsteady aerodynamics. The he...
متن کاملHelicopter Rotor Airloads Prediction Using CFD and Flight Test Measurement in Hover Flight
An implicit unsteady upwind solver including a mesh motion approach was applied to simulate a helicopter including body, main rotor and tail rotor in hover flight. The discretization was based on a second order finite volume approach with fluxes given by the Roeand#39;s scheme. Discretization of Geometric Conservation Laws (GCL) was devised in such a way that the three-dimensional flows on arbi...
متن کاملApplications of the Unsteady Vortex-Lattice Method in Aircraft Aeroelasticity and Flight Dynamics
The Unsteady Vortex-Lattice Method provides a medium-fidelity tool for the prediction of non-stationary aerodynamic loads in low-speed, but high-Reynolds-number, attached flow conditions. Despite a proven track record in applications where free-wake modelling is critical, other less-computationally-expensive potential-flow models, such as the Doublet-Lattice Method and strip theory, have long b...
متن کاملState-space representation of the unsteady aerodynamics of flapping flight
State-space representation of the unsteady aerodynamics of flapping flight" (2014). ARTICLE INFO ABSTRACT Article history: A state-space formulation for the aerodynamics of flapping flight is presented. The Duhamel's principle, applied in linear unsteady flows, is extended to non-conventional lift curves to capture the LEV contribution. The aspect ratio effects on the empirical formulae used to...
متن کاملHypersonic Aerothermoelasticity with Application to Reusable Launch Vehicles
The hypersonic aeroelastic and aerothermoelastic problem of a double-wedge airfoil typical cross-section is studied using three different unsteady aerodynamic loads: (1) third-order piston theory, (2) Euler aerodynamics, and (3) Navier-Stokes aerodynamics. Computational aeroelastic response results are used to obtain frequency and damping characteristics, and compared with those from piston the...
متن کامل