On the Validation and Use of High-Fidelity Numerical Simulations for Gust Response Analysis

Abstract

Aeroelasticity and Structural DynamicsOn the Validation and Use of High-Fidelity Numerical Simulations for Gust Response Analysis S pecific gust response is considered as one of the most important loads encountered by an aircraft. The Certification Specification (CS) 25, defined by the European Aviation Safety Agency (EASA), and the Federal Aviation Regulations (FAR) 25, defined by the Federal Aviation Administration (FAA), describe the critical gusts that an aircraft must withstand. They must be analyzed for a large range of flight points (Altitude and Equivalent Air speed) and mass configurations. For some load cases, the standard tools could not be accurate enough to correctly predict the gust response and the use of high-fidelity computation could be required. Therefore, ONERA has implemented in its in-house Computational Fluid Dynamics (CFD) code elsA (ONERA-Airbus-Safran property) the capability to compute the high-fidelity aeroelastic gust response, directly in the time-domain, for different discrete gust shapes. This paper presents some recent work achieved at ONERA concerning high-fidelity simulations for gust response. First, a physical validation of the gust response simulation is performed by comparing the results to those obtained experimentally on a scaled model. Second, numerical comparisons are performed using various techniques, in order to model the gust. Finally, an application for generic regional aircraft is shown.

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“…They concluded that the structural weight saving was mainly limited by the allowed load factors considered in such optimization, the finite control authority of the actuators, and the achievable reliability of the GLA system itself. Huvelin et al [4] conducted a numerical simulation for the gust response along with experimental results at ONERA to present a gust load alleviation study. Numerical comparisons were performed using various techniques of gust modeling and finally, an application example for gust load alleviation was presented.…”