Concept

Équations de Boussinesq

Publications associées (130)

Gyrokinetic transport relations for gyroscale turbulence

Laurent Villard, Alberto Bottino, Sébastien Jolliet, Ben McMillan, Thibaut Vernay

We derive explicit local transport relations for the global gyrokinetic formalism at arbitrary wavelength. This is an extension of the analysis in Scott et. al. 2010 where this was examined in the long-wavelength limit. Deriving a local expression for the ...

IOP Publishing2012

Anomalous Transmission Properties of Ultranarrow, Zero-Density Acoustic Metachannels

Romain Christophe Rémy Fleury

We present the acoustic equivalent of supercoupling through subwavelength channels. Extraordinary matched transmission, energy squeezing and anomalous quasistatic tunnelling through narrow channels are obtained for acoustic waves by designing a 2D, density ...

2012

Approximate Cloaking for the Full Wave Equation via Change of Variables

Hoài-Minh Nguyên

We study, in the context of the full wave equation, an approximate cloaking scheme that was previously considered for the Helmholtz equation [R. V. Kohn, D. Onofrei, M. S. Vogelius, and M. I. Weinstein, Comm. Pure Appl. Math., 63 (2010), pp. 973--1016, H.- ...

Society for Industrial and Applied Mathematics2012

Hydrodynamic Instabilities in Well-Balanced Finite Volume Schemes for Frictional Shallow Water Equations. The Kinematic Wave Case

Martin Rentschler

We report the developments of hydrodynamic instabilities in several well-balanced finite volume schemes that are observed during the computation of the temporal evolution of an out-balance flow which is essentially a kinematic wave. The numerical simulatio ...

Springer Verlag2011

Monitoring of steel-lined pressure shafts using water-hammer records and wavelet filtering and decomposition

Anton Schleiss, Fadi Hachem

The failure of steel liner of pressure shafts of hydropower plants can have catastrophic consequences. The partial or total loss of the liner support’s rigidity is characterized by a local change of the hydro-acoustic properties and creates reflection boun ...

2011

Free-surface fluid dynamics on moving domains

Thomas Zimmermann, Matthias Preisig

This paper presents a Lagrangian approach for the simulation of two-dimensional free-surface flows along with a systematic validation. Fluid-flow is traditionally modeled using an Eulerian description in association with finite differences and, more recent ...

2011

A review of wave celerity in frictionless and axisymmetrical steel-lined pressure tunnels

Anton Schleiss, Fadi Hachem

Generally applicable approaches for estimating the‘‘quasi-static’’, which means without fluid–structure interaction and frequency-dependent water-hammer wave speed in steel-lined pressure tunnels are analyzed. The external constraints and assumptions of th ...

Elsevier2011

Electrostatic instabilities, turbulence and fast ion interactions in the TORPEX device

Ambrogio Fasoli, Ivo Furno, Paolo Ricci, Benoît Labit, Christian Gabriel Theiler, Joaquim Loizu Cisquella, Mario Ludovico Podesta, Francesca Maria Poli, Gennady Plyushchev, Kyle Gustafson, Lucia Isabel Federspiel, Davoud Iraji, Stefan Müller, Alice Burckel

Electrostatic turbulence, related structures and their effect on particle, heat and toroidal momentum transport are investigated in TORPEX simple magnetized plasmas using high-resolution diagnostics, control parameters, linear fluid models and nonlinear nu ...

Institute of Physics2010

Competition between kinematic and dynamic waves in floods on steep slopes

We present a theoretical stability analysis of the flow after the sudden release of a fixed mass of fluid on an inclined plane formally restricted to relatively long time scales, for which the kinematic regime is valid. Shallow-water equations for steep sl ...

Cambridge University Press2010

Decay Estimates for the One-dimensional Wave Equation with an Inverse Power Potential

Roland Donninger

We study the wave equation on the real line with a potential that falls off like vertical bar x vertical bar(-alpha) for vertical bar x vertical bar -> infinity where 2 < alpha infini ...

Oxford University Press2010

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