Journal Article10.2514/1.16995
Numerical Simulation and Reduced-Order Modeling of Airfoil Gust Response
Avi Zaide,Daniella E. Raveh +1 more
92
TL;DR: In this paper, a reduced-order model is used to predict the lift and pitching moment histories accurately throughout the subsonic and transonic regimes of an airfoil to arbitrary shaped gust inputs.
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Abstract: I. Abstract Computational Fluid Dynamics (CFD) based simulations, along with parametric and non-parametric Reduced-Order Models (ROM) for gust responses are presented. A CFD code is enhanced to simulate responses of an airfoil to arbitrary shaped gust inputs. Time-domain Auto-Regressive-Moving-Average (ARMA) models are identified based on CFD responses to random gust excitations, using system-identification methods. Responses to discrete gusts of various shapes, amplitudes and gradient lengths are computed via the ROMs and compared to responses simulated directly by the CFD code. The ROMs predict the lift and pitching moment histories accurately throughout the subsonic and transonic regimes. They offer significant savings in computational resources compared to the full CFD simulation, since only one CFD run is required for ROM identification, from which responses to arbitrary shaped gusts can be rapidly estimated. The combination of ROMs and full CFD simulations offers a computationally efficient tool set of various-fidelity time-domain models for gust responses. The ROMs can be used for rapid tuned-gust analyses, and the critical cases can be simulated with a full CFD run, providing pressure distribution for airframe structural design.
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Citations
Simulation and Modeling of Rigid Aircraft Aerodynamic Responses to Arbitrary Gust Distributions
Mehdi Ghoreyshi,Ivan Greisz,Adam Jirasek,Matthew Satchell +3 more
- 18 Apr 2018
TL;DR: In this paper, the authors presented the efforts to simulate and model air vehicle aerodynamic responses to various gust profiles, including sharp edge, one minus cosine, a ramp, and a 1-cosine using tabulated data consisting of gust intensity values at discrete time instants.
14
Analysis of vortical gust impact on airfoils at low Reynolds number
C. Martínez-Muriel,Oscar Flores +1 more
TL;DR: In this paper, the response of a NACA0012 airfoil impacted by vortical gusts is investigated performing Direct Numerical Simulations of the two-dimensional incompressible flow.
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An efficient implementation of aeroelastic tailoring based on efficient computational fluid dynamics-based reduced order model
TL;DR: A rapid computational fluid dynamics based aeroelastic tool is presented which is built around a reduced order model for the aerodynamics that is updated for any modification of the structure by using the structural dynamics reanalysis method.
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Application of Active Flow Control Technique for Gust Load Alleviation
TL;DR: In this article, a new gust load alleviation technique based on active flow control is presented, which can affect and suppress the fluid disturbances caused by gust so as to achieve the purpose of alleviation.
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Gust Response Analysis Using CFD-Based Reduced Order Models
Weiwei Zhang,Qing Yang,Aiming Shi +2 more
- 05 Jan 2009
TL;DR: In this paper, based on CFD technique and system identification method, a CFD-based reduced order model (ROM) is constructed in state space, which is compact and computationally efficient and validates the correctness and precision of the CFd-based ROM method.
13
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