Ants are a dominant insect group in terrestrial ecosystems and many myrmecophilous species evolve to associate with ants to gain benefits. One iconic example is myrmecophilous butterflies that often produce ant-mimicking vibrational calls to modulate ant behaviors. Despite its popularity, empirical exploration of how butterflies utilize vibrational...
This paper focus on the dynamic of a spray issued from the shearing of a liquid jet injected in an air crossflow submitted to high acoustic perturbations. Experimental and numerical approaches are used. Characterization of the liquid jet close to the injection location is obtained from high speed visualizations performed with a back lighting techni...
High-fidelity simulation performed with the CFD code elsA has been used to improve a fast prediction code, named ARHIS, dedicated to the prediction of the aerodynamic response of a blade in interaction with a vortex. To do so, comparisons have been made on a well documented blade-vortex interaction configuration. After validation of the computation...
In this paper, a modeling extension for the description of wave propagation in rigid porous media at high frequencies is used. To better characterize the visco-inertial and thermal interactions between the fluid and the structure in this regime, two additional characteristic viscous and thermal surfaces R and R0 are taken into account, as initially...
In this article, a modeling extension for the description of wave propagation in porous media at low-mid frequencies is introduced. To better characterize the viscous and inertial interactions between the fluid and the structure in this regime, two additional terms described by two parameters α1 and α2 are taken into account in the representation o...
For vibro-acoustic applications, a turbulent wall pressure fluctuations model was derived. The model is based on the resolution of the Poisson equation. The pressure is characterized in time and space through its spectrum in the pulsation wave-number domain. The developed model follows trends commonly observed using Corcos model in a large pulsatio...
Acoustics '17, BOSTON, ETATS-UNIS, 25-/06/2017 - 29/06/2017
For moderate-to-high Reynolds numbers, aerofoils are known to produce substantial levels of acoustic radiation, known as tonal noise, which arises from a complex interplay between laminar boundary-layer instabilities, trailing-edge acoustic scattering and upstream receptivity of the boundary layers on both aerofoil surfaces. The resulting acoustic ...
This paper presents the modeling and numerical simulations of the vibrational behavior of sandwich panels locally overloaded by a fractal distribution of masses. The structural model hypotheses consist in a homogenized material, which is overloaded by small masses distributed following a fractal pattern. The flat panel is then uniformly discretized...
