Reduced Order Gust Response Simulation using Computational Fluid Dynamics

Bekemeyer, Philipp and Timme, Sebastian ORCID: 0000-0002-2409-1686 (2016) Reduced Order Gust Response Simulation using Computational Fluid Dynamics. In: 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2016-1-4 - 2016-1-8, San Diego, CA.

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Abstract

The investigation of gust response problems is a crucial and, if high accuracy is desired, time consuming task. Since linear frequency domain methods have previously shown significant reduction in computational cost for motion-induced aerodynamics, an extension towards gust excitation is proposed. Time-domain signals are reconstructed by a super- position of responses at several discrete frequencies. Once frequency domain solutions are available, a reduced order model is constructed projecting the linearised Reynolds-averaged Navier-Stokes equations on a combined modal basis. While eigenmodes are accurate in predicting structural vibration, additional modes from proper orthogonal decomposition capture aerodynamic effects due to gust excitation. For all methods a two-dimensional NACA0012 aerofoil is investigated at sub- and transonic conditions. Limitations of the linearised approach are first outlined by increasing the gust amplitude at both operating points. Subsequently, a worst case gust length search is performed and it is shown that the computational cost is reduced case dependent by several orders of magnitude compared to the original system.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	?? TA ??
Depositing User:	Symplectic Admin
Date Deposited:	21 Jan 2016 09:09
Last Modified:	17 Dec 2022 00:49
DOI:	10.2514/6.2016-1485
Related URLs:	Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/2047979