Prediction of Transonic LCOs using an Aeroelastic Harmonic Balance Method

Weigang Yao, Simão Marques

Research output: Contribution to conferencePaperpeer-review

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Abstract

This work proposes a novel approach to compute transonic Lim
it Cycle Oscillations using high fidelity analysis. CFD based Harmonic Balance methods have proven to be efficient tools to predict periodic phenomena. This paper’s contribution is to present a new methodology to determine the unknown frequency of oscillations, enabling HB methods to accurately capture Limit Cycle Oscillations (LCOs); this is achieved by defining a frequency updating procedure based on a coupled CFD/CSD Harmonic Balance formulation to find the LCO condition. A pitch/plunge aerofoil and delta wing aerodynamic and respective linear structural models are used to validate the new method against conventional time-domain simulations. Results show consistent agreement between the proposed and time-marching methods for both LCO amplitude and frequency, while producing at least one order of magnitude reduction in computational time.
Original languageEnglish
DOIs
Publication statusPublished - 18 Jun 2014
Event44th AIAA Fluid Dynamics Conference - GA, Atlanta, United States
Duration: 16 Jun 201420 Jun 2014

Conference

Conference44th AIAA Fluid Dynamics Conference
Country/TerritoryUnited States
CityAtlanta
Period16/06/201420/06/2014

Keywords

  • CFD
  • Aeroelasticity
  • Nonlinear
  • Harmonic Balance
  • Limit Cycle Oscillations

ASJC Scopus subject areas

  • Aerospace Engineering

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