Physical Review Fluids

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Recent articles in Physical Review Fluids
Updated: 2 days 3 hours ago

Drag upon a sphere suspended in a low magnetic-Reynolds number MHD channel flow

Wed, 12/05/2018 - 10:00

Author(s): Jules Delacroix and Laurent Davoust

As a first step towards the description of magnetohydrodynamic (MHD) dispersed two-phase flows, a permanent MHD channel flow past a stationary sphere is numerically investigated, highlighting the gradual emergence of atypical MHD flow patterns, among them a genuine “ghost column.”

[Phys. Rev. Fluids 3, 123701] Published Wed Dec 05, 2018

Effect of layout on asymptotic boundary layer regime in deep wind farms

Wed, 12/05/2018 - 10:00

Author(s): Juliaan Bossuyt, Charles Meneveau, and Johan Meyers

This paper presents wind tunnel data for 56 different layouts of a scaled wind farm with 100 porous disk models. The data indicates that a nonuniform streamwise spacing between turbine rows can increase power output in the fully developed and entrance regions of large wind farms.

[Phys. Rev. Fluids 3, 124603] Published Wed Dec 05, 2018

Rectification of chaotic fluid motion in two-dimensional turbulence

Tue, 12/04/2018 - 10:00

Author(s): N. Francois, H. Xia, H. Punzmann, and M. Shats

In two-dimensional turbulence, we show how to create devices able to feed on the turbulent fluid motion by coupling with underlying features of the energy cascade. By changing the shape of the device, we can turn it into a self-propelled vehicle or a rotor powered by turbulence.

[Phys. Rev. Fluids 3, 124602] Published Tue Dec 04, 2018

Modeling internal rogue waves in a long wave-short wave resonance framework

Tue, 12/04/2018 - 10:00

Author(s): H. N. Chan, R. H. J. Grimshaw, and K. W. Chow

Rogue waves in the interior of a stratified fluid are modeled as special breathers (pulsating modes) arising from long-wave–short-wave resonance. Features like the existence condition and waveforms contrast sharply with those of free surface waves governed by the nonlinear Schrödinger equation.

[Phys. Rev. Fluids 3, 124801] Published Tue Dec 04, 2018

Sedimentation of a rigid helix in viscous media

Mon, 12/03/2018 - 10:00

Author(s): Martina Palusa, Joost de Graaf, Aidan Brown, and Alexander Morozov

A theoretical study of rigid helices sedimenting under gravity finds they either follow a helical path downwards, or exhibit complicated oscillations close to the horizontal orientation.

[Phys. Rev. Fluids 3, 124301] Published Mon Dec 03, 2018

Energy transport due to pressure diffusion enhanced by helicity and system rotation in inhomogeneous turbulence

Mon, 12/03/2018 - 10:00

Author(s): Kazuhiro Inagaki and Fujihiro Hamba

It is known that turbulent energy is rapidly transferred in the direction of the rotation axis in a rotating system, in comparison with the nonrotating case. A new turbulence model of the energy flux predicting this phenomenon is proposed and discussed in terms of turbulent helicity.

[Phys. Rev. Fluids 3, 124601] Published Mon Dec 03, 2018

Universal scaling law in frictional non-Brownian suspensions

Fri, 11/30/2018 - 10:00

Author(s): Frédéric Blanc, Enzo D'Ambrosio, Laurent Lobry, François Peters, and Elisabeth Lemaire

Suspensions made of either faceted or spherical particles behave in quite different ways. However, experiments show that it is possible to unify their behavior by considering the contact contribution to the viscosity that is evaluated through shear reversal experiments.

[Phys. Rev. Fluids 3, 114303] Published Fri Nov 30, 2018

Mass entrainment-based model for separating flows

Fri, 11/30/2018 - 10:00

Author(s): F. Stella, N. Mazellier, P. Joseph, and A. Kourta

The recirculation flow bounding a forced separating and reattaching shear layer is modeled. Experimental results emphasize that mass entrainment is a key parameter on which the parameters of the model scale. It is shown that an inexpensive and easily deployable sensor can be used to estimate the backflow.

[Phys. Rev. Fluids 3, 114702] Published Fri Nov 30, 2018

Versatile reduced-order model of leading-edge vortices on rotary wings

Fri, 11/30/2018 - 10:00

Author(s): D. Chen, D. Kolomenskiy, R. Onishi, and H. Liu

An analytical model is proposed for the strength and position of the Leading Edge Vortex on a revolving wing at an arbitrary angle of attack. Predictions are compared with experiments and numerical solutions.

[Phys. Rev. Fluids 3, 114703] Published Fri Nov 30, 2018

Multiple states and heat transfer in two-dimensional tilted convection with large aspect ratios

Thu, 11/29/2018 - 10:00

Author(s): Qi Wang, Zhen-Hua Wan, Rui Yan, and De-Jun Sun

Multiple stable states exist for two-dimensional tilted convection with large aspect ratios (Γ≥2). The Nusselt number generally decreases monotonically with increasing tilt angle for large Γ cases with Γ≥8.

[Phys. Rev. Fluids 3, 113503] Published Thu Nov 29, 2018

Conditionally averaged flow topology about a critical point pair in the skin friction field of pipe flows using direct numerical simulations

Wed, 11/28/2018 - 10:00

Author(s): R. C. Chin, J. P. Monty, M. S. Chong, and I. Marusic

The flow topology in the vicinity of critical points in a pipe flow reveals turbulence motions resembling hairpin-like vortical structures. Three-dimensional U separation is found to be closely associated with critical points that could form a simple model for wall turbulence.

[Phys. Rev. Fluids 3, 114607] Published Wed Nov 28, 2018