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Communication Dans Un Congrès Année : 2022

Frequency-independent modeling of experimental fluidelastic forces using hidden flow variables

Résumé

Experimentally identified fluidelastic forces typically are frequency-dependent, as amply documented in the literature since the work of Tanaka & Takahara (1981). Such frequency dependence, which seems quite natural in view of the flows intricacies, not only is awkward when attempting physical interpretations, but also leads to numerical difficulties when performing time-domain computations. In this work, we address this problem by assuming that the measured fluidelastic forces encapsulate "hidden" (non-measured) dynamics of the coupled flow. The substructure analysis of such a model, augmented with a set of "hidden" flow variables, readily highlights an inevitability of the frequency-dependence found in the measured flow forces. Moreover, the formulation thus obtained clearly suggests the mathematical structure of the measured fluidelastic forces, providing the justification for a modeling approach used in unsteady aeroelasticity, see for instance Eversman & Tewari (1991). Then, based on the work developed by Cottereau et al. (2007) in the soil-structure field, we proceed by identifying adequate frequency-independent flow-coupling matrices from the frequency-dependent experimental data, which is a somewhat involved problem. Finally, the developed concepts and procedures are applied with success to experimental results obtained at CEA by Piteau et al. (2016), for the fluidelastic forces acting on a flexible tube within a rigid bundle.
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Dates et versions

cea-04488805 , version 1 (04-03-2024)

Identifiants

  • HAL Id : cea-04488805 , version 1

Citer

Jose Antunes, Philippe Piteau, Xavier Delaune, Romain Lagrange. Frequency-independent modeling of experimental fluidelastic forces using hidden flow variables. FIV 2022, Jul 2022, Paris, France. pp.1. ⟨cea-04488805⟩
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