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Article Dans Une Revue AIAA Journal Année : 2022

System Identification of Two-Dimensional Transonic Buffet

Résumé

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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Dates et versions

hal-03906486 , version 1 (19-12-2022)

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Andrea Sansica, Jean-Christophe Loiseau, Masashi Kanamori, Atsushi Hashimoto, Jean-Christophe Robinet. System Identification of Two-Dimensional Transonic Buffet. AIAA Journal, 2022, 60 (5), pp.3090-3106. ⟨10.2514/1.j061001⟩. ⟨hal-03906486⟩
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