Nonlinear disturbance evolution in a two-dimensional boundary layer along an elastic plate and induced radiated sound
TypeArticles dans des revues avec comité de lecture
The interaction between a boundary-layer flow and an elastic plate is addressed by direct numerical simulation, taking into account the full coupling between the fluid flow and the flexible wall. The convectively unstable flow state is harmonically forced and two-dimensional nonlinearly saturated wavelike disturbances are computed along archetype-plates with respect to stiffness and natural frequencies. In the aim of determining the low-Mach-number radiated sound for the system, the simulation data are used to solve the Lighthill’s equation in terms of a Green’s function in the wavenumber-frequency space. Different degrees of fluid-structure coupling are implemented in the radiated sound model and the resulting acoustic pressure levels are compared. The sound radiation levels are shown to be increased in the presence of flexible walls with however significant differences in the radiated pressure levels for different coupling assumptions
Showing items related by title, author, creator and subject.
DUCOIN, Antoine; ASTOLFI, Jacques Andre; GOBERT, Marie-Laure (ELSEVIER, 2012)This paper aims at characterizing experimentally laminar to turbulent transition induced vibrations. Here, the transition is known to be triggered by a Laminar Separation Bubble that results from a laminar separation of ...
MARCHAND, Jean-Baptiste; ASTOLFI, Jacques Andre; BOT, Patrick (Elsevier, 2017)This work presents an experimental investigation of a hydrofoil in reversed flow configuration in the context of marine current turbine development. Experiments consist in hydrodynamic force measurements and PIV flow ...
FRIKHA, Sobhi; COUTIER-DELGOSHA, Olivier; ASTOLFI, Jacques Andre (Hindawi Publishing Corporation, 2008)For numerical simulations of cavitating flows, many physical models are currently used. One approach is the void fraction transport equation-based model including source terms for vaporization and condensation processes. ...
Simulating variable pitch crossflow water turbines: A coupled unsteady ONERA-EDLIN model and streamtube model PAILLARD, Benoît; HAUVILLE, Frédéric; ASTOLFI, Jacques Andre (ELSEVIER, 2013)This article describes a new method for simulating unsteady hydrodynamics forces and moments on the blades of a crossflow ‘Darrieus’ turbine with active pitch variation. This method is based on the ONERAEDLIN dynamic stall ...
URANSE simulation of an active variable-pitch cross-flow Darrieus tidal turbine: Sinusoidal pitch function investigation PAILLARD, Benoît; ASTOLFI, Jacques Andre; HAUVILLE, Frédéric (ELSEVIER, 2015)This article describes a 2D CFD simulation implementation of a crossflow tidal turbine, the blades of which have their pitch modified during revolution. Unsteady flow around the turbine is computed with an URANSE method, ...