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System Identification of Two-Dimensional Transonic Buffet

Article dans une revue avec comité de lecture
Author
SANSICA, Andrea
47050 Japan Aerospace Exploration Agency [Tokyo] [JAXA]
KANAMORI, Masashi
47050 Japan Aerospace Exploration Agency [Tokyo] [JAXA]
HASHIMOTO, Atsushi
47050 Japan Aerospace Exploration Agency [Tokyo] [JAXA]
ccLOISEAU, Jean-Christophe
134975 Laboratoire de Dynamique des Fluides [DynFluid]
ccROBINET, Jean-Christophe
134975 Laboratoire de Dynamique des Fluides [DynFluid]

URI
http://hdl.handle.net/10985/23062
DOI
10.2514/1.j061001
Date
2022-02
Journal
AIAA Journal

Abstract

When modeled within the unsteady Reynolds-Averaged Navier-Stokes framework, the shock-wave dynamics on a two-dimensional aerofoil at transonic buffet conditions is char- acterized by time-periodic oscillations. Given the time series of the lift coefficient at different angles of attack for the OAT15A supercritical profile, the sparse identification of nonlinear dy- namics (SINDy) technique is used to extract a parametrized, interpretable and minimal-order description of this dynamics. For all of the operating conditions considered, SINDy infers that the dynamics in the lift coefficient time series can be modeled by a simple parametrized Stuart-Landau oscillator, reducing the computation time from hundreds of core hours to sec- onds. The identified models are then supplemented with equally parametrized measurement equations and low-rank DMD representation of the instantaneous state vector to reconstruct the true lift signal and enable real-time estimation of the whole flow field. Simplicity, accuracy and interpretability make the identified model a very attractive tool towards the construction of real-time systems to be used during the design, certification and operational phases of the aircraft life cycle.

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