Investigation of the Ffowcs-Williams and Hawkings Analogy on an Isolated Landing Gear Wheel - Sorbonne Université Access content directly
Conference Papers Year : 2018

Investigation of the Ffowcs-Williams and Hawkings Analogy on an Isolated Landing Gear Wheel

Abstract

This paper addresses the use of the so-called solid and permeable formulations of the Ffowcs-Williams & Hawkings (FW-H) equation in the scope of bluff body noise predictions. The aerodynamic turbulent flow is computed around and downstream of an isolated landing gear wheel from the LAGOON configuration by means of a Zonal Detached Eddy Simulation initiated in a previous study at a Mach number of 0.23. The aerodynamic field obtained with this simulation is then used to compute the FW-H integral respectively on the wheel solid walls and on a permeable surface that encloses the wheel and the most turbulent portion of its wake. The solid FW-H results are shown to be little influenced by the accurate resolution of the wake, with differences in the integrated levels of less than 2 dB only in the upstream direction. The comparison between the solid and permeable formulation results allows to check that at this Mach number, the quadrupolar contribution of the sources present in the wake of this landing gear wheel can be discarded for Strouhal numbers up to 19.3 (5 kHz). As previously observed in several studies, removing the endcap closure of the permeable surface reduces the spurious noise induced by the eddies passing through it. The influence of the FW-H surface discretisation is assessed by considering two levels of resolution. In this study, refining the outflow surface has shown to greatly reduce the spurious noise while the integration surface was kept closed.
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Dates and versions

hal-02140498 , version 1 (22-02-2024)

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Antoine Hajczak, Laurent Sanders, Vuillot François, Philippe Druault. Investigation of the Ffowcs-Williams and Hawkings Analogy on an Isolated Landing Gear Wheel. 24th AIAA/CEAS Aeroacoustic Conference, Jun 2018, Atlanta, United States. ⟨10.2514/6.2018-3301⟩. ⟨hal-02140498⟩
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