European Journal of Mechanics - B/Fluids

Items from 1 to 12 out of 12 results

article

Flows of rarefied gaseous mixtures with a low mole fraction. Separation phenomenon

Denize Kalempa, Felix Sharipov

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 466-473

An approach to a model of rarefied gaseous mixtures with a low mole fraction of one species based on the linearized Boltzmann equation is proposed. As an example, the separation phenomenon in a binary gaseous mixture flowing through a long tube into a vacuum is considered by assuming an arbitrary pressure at the tube’s entrance. In this situation, the regime of gas flow along the tube can vary from...

article

A turbulence model for Smoothed Particle Hydrodynamics

J.J. Monaghan

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 360-370

The aim of this paper is to describe a turbulence model for the particle method Smoothed Particle Hydrodynamics (SPH). The model makes few assumptions, conserves linear and angular momentum, satisfies a discrete version of Kelvin’s circulation theorem, and is computationally efficient. Furthermore, the results from the model are in good agreement with the experimental and computational results of...

article

Three-dimensional periodic interfacial gravity waves: Analytical and numerical results

N. Allalou, M. Debiane, C. Kharif

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 371-386

The properties of fully three-dimensional gravity waves propagating on the interface between two finite layers of different densities are investigated. Solutions are calculated via a computer-generated perturbation expansion in wave steepness. Series solutions are analytically computed to third-order for general wave parameters, and numerically to 27th-order for five specific values of μ=0,0.001,0...

article

On the vortical structures and behaviour of inclined elliptic jets

T.H. New, D. Tsovolos

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 437-450

A study has been carried out to clarify vortical structures and behaviour resultant from imposing inclined exits along either the major or minor plane of an elliptic nozzle. Laser-induced fluorescence (LIF) flow visualizations show production of inclined vortex roll-ups along the inclined planes, with corresponding narrowing of jet columns along the non-inclined planes. Minor-plane inclined nozzles...

article

Waves in two-layer shear flow for viscous and inviscid fluids

Michael J. Chen, Lawrence K. Forbes

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 387-404

A two-layer shear flow is studied for inviscid and viscous fluids. Here, the layers flow between two horizontal walls and are buoyantly stable. Each layer contains a finite amount of shear and the horizontal velocity is specified such that it is continuous when unperturbed. The interface between the two layers is given a small sinusoidal perturbation and the subsequent response of the system is studied...

article

Effect of wall conductivity on current distribution and turbulence in a channel flow with spanwise magnetic field

Dmitry Krasnov, Prarthana Parepalli, Oleg Zikanov, Thomas Boeck

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 421-427

The effect of wall conductivity on turbulence in electrically conducting fluid in the presence of a constant magnetic field is considered. A channel flow with a spanwise magnetic field is analyzed using high-resolution direct numerical simulations performed for the case of low magnetic Reynolds number. It is found that the effect of suppression of wall-normal momentum transfer and reduction of wall...

article

Experimental investigation of the effect of endplates and sidewalls on the near field development of a smooth contraction rectangular jet

M. Alnahhal, A. Cavo, A. Romeos, K. Perrakis, more

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 451-465

The effects of different boundary conditions on the near field development of a turbulent rectangular jet issuing from a smooth contraction nozzle of aspect ratio 15 have been studied experimentally with x-wire Hot-Wire Anemometry (HWA). Four different configurations resulting from the presence or absence of endplates–configuring a jet out of a wall–and sidewalls, confining the jet at the planes of...

article

Editorial Board

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > IFC

article

Numerical simulation of the spectral development of inviscid helical flows

G. Ooms, B.J. Boersma, M.J.B.M. Pourquie

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 428-436

We have studied numerically the time development of the energy spectrum of inviscid, incompressible, helical flows. It is well known that helicity delays the development of turbulence. The aim of this paper is to study this phenomenon in more detail by investigating the influence of the number of modes in the initial flow field on the spectral development. We studied the cases with one, two, three...

article

Motion of a sphero-cylindrical particle in a viscous fluid in confined geometry

A. Mongruel, N. Lecoq, E. Wajnryb, B. Cichocki, more

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 405-408

The motion of a millimeter size spherocylinder particle settling in a very viscous oil in a closed container is measured by laser interferometry, with the goal to model the motion of a particle of this shape in a fluid at microscales. The container is a cylinder with vertical axis and closed at both ends by horizontal plates. The displacement of the particle along the container axis is recorded with...

article

Violent flows in aqueous foams I: Physical and numerical models

Sylvain Faure, Jean-Michel Ghidaglia

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 341-359

Mitigation of blast waves by aqueous foams is an important technological issue. Despite many theoretical and experimental works on the subject, it has not been possible until now to have simple analytical expressions or abaci giving the pressure as a function of the distance to the charge, of its strength and of the characteristics of the foam. This naturally leads to attempts at using numerical simulations...

article

Stability of bifluid jets in microchannels

Thierry Colin, Sandra Tancogne

European Journal of Mechanics / B Fluids > 2011 > 30 > 4 > 409-420

In this paper, a numerical tool is provided in order to study the stability of a confined coflowing jet in a cylindrical geometry. For a given configuration in which the flow rates, viscosities, diameter of the channel, and surface tension are the adjustable parameters, the length on which a jet is stable is computed. At low Reynolds number in a cylindrical geometry, two main configurations have been...

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Number:
4
Volume:
30
Year:
2011

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Keywords

TURBULENCE (3)
SHEAR FLOW (2)
2D BOX (1)
AQUEOUS FOAMS (1)
BLAST WAVES (1)
BOLTZMANN EQUATION (1)
CHANNEL FLOW (1)
DIPHASIC JETS (1)
DROPLETS (1)
ELLIPTIC JET (1)
FINITE VOLUME WITH CHARACTERISTIC FLUX (1)
GASEOUS MIXTURE (1)
HARMONIC RESONANCE (1)
HELICITY (1)
INCLINED NOZZLE (1)
INVISCID FLOW (1)
LASER-INDUCED FLUORESCENCE (1)
LINEAR STABILITY (1)
LINEARIZATION (1)
MAGNETOHYDRODYNAMICS (1)
MICROFLUIDICS (1)
NUMERICAL SIMULATION (1)
PADÉ APPROXIMANTS (1)
PARTICLE-IMAGE VELOCIMETRY (1)
PERIODIC DISTURBANCE (1)
PERTURBATION METHOD (1)
PERTURBATION SERIES (1)
PLANE JET (1)
RAYLEIGH–PLATEAU (1)
RECTANGULAR JET (1)
SEDIMENTATION (1)
SEPARATION PHENOMENON (1)
SPH (1)
STABILITY LENGTH (1)
STOKES FLOWS (1)
SUSPENSIONS (1)
THREE-DIMENSIONAL INTERFACIAL WAVES (1)
TWO-PHASE-THREE-FLUID MODEL (1)
VISCOUS FLUID (1)
VORTICITY (1)
WAVE FREQUENCY BIFURCATION (1)
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