Latest papers in fluid mechanics

Mass entrainment-based model for separating flows

Physical Review Fluids - 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

Physical Review Fluids - 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

Physical Review Fluids - 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

Physical Review Fluids - 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

Impact of clogging on the transfer dynamics of hydraulic networks

Physical Review E - Tue, 11/27/2018 - 10:00

Author(s): D. S. Griffani, P. Rognon, and I. Einav

We investigate how clogging affects the transfer properties of a generic class of materials featuring a hydraulic network embedded in a matrix. We consider the flow of a liquid through fully saturated hydraulic networks which transfer heat (or mass) by advection and diffusion, and a matrix in which ...

[Phys. Rev. E 98, 053107] Published Tue Nov 27, 2018

Phenomenology of bubble-collapse-driven penetration of biomaterial-surrogate liquid-liquid interfaces

Physical Review Fluids - Tue, 11/27/2018 - 10:00

Author(s): Shucheng Pan, Stefan Adami, Xiangyu Hu, and Nikolaus A. Adams

Bubble-collapse-driven penetration of liquid-liquid interfaces exhibits two scaling ranges of penetration depth vs time. Detailed numerical simulations show that size and evolution of generated interface perforations depend on viscosity, shock strength, and single- or multiple-bubble configurations.

[Phys. Rev. Fluids 3, 114005] Published Tue Nov 27, 2018

Negative acoustic radiation force induced on an elastic sphere by laser irradiation

Physical Review E - Mon, 11/26/2018 - 10:00

Author(s): Hai-Qun Yu, Jie Yao, Da-Jian Wu, Xue-Wei Wu, and Xiao-Jun Liu

We propose an alternative strategy to modulate the acoustic radiation force (ARF) acting on an elastic sphere (ES) using laser irradiation. A mathematical model of the interaction of the acoustic plane wave with the laser-irradiated ES is developed to calculate the ARF acting on the ES. It is demons...

[Phys. Rev. E 98, 053105] Published Mon Nov 26, 2018

Three-dimensional transition of zero-pressure-gradient boundary layer by impulsively and nonimpulsively started harmonic wall excitation

Physical Review E - Mon, 11/26/2018 - 10:00

Author(s): Pushpender Sharma, Tapan K. Sengupta, and Swagata Bhaumik

A three-dimensional (3D) transition route for zero-pressure-gradient boundary layer over a flat plate is computationally investigated, for impulsive and nonimpulsive startup of harmonic wall excitation. A monochromatic frequency of excitation is chosen to perturb the boundary layer. The exciter plac...

[Phys. Rev. E 98, 053106] Published Mon Nov 26, 2018

Classical impulsive model for dissociation of diatomic molecules in direct simulation Monte Carlo

Physical Review Fluids - Mon, 11/26/2018 - 10:00

Author(s): Han Luo, Israel B. Sebastião, Alina A. Alexeenko, and Sergey O. Macheret

This paper presents a new implementation of the Macheret-Fridman dissociation model for the direct simulation Monte Carlo method to model thermal nonequilibrium dissociation reactions. We find good agreement with recent quasi-classical trajectory calculations and recent experimental results.

[Phys. Rev. Fluids 3, 113401] Published Mon Nov 26, 2018

Simulation of surfactant-mediated tipstreaming in a flow-focusing geometry

Physical Review Fluids - Mon, 11/26/2018 - 10:00

Author(s): Jacek K. Wrobel, Michael R. Booty, Michael Siegel, and Qiming Wang

A surfactant coated drop is drawn through an aperture by a converging flow. Under suitable conditions that have also been investigated in a series of independently led experiments, the drop tip emits a thin tipstreaming thread that later breaks up into near-monodisperse droplets.

[Phys. Rev. Fluids 3, 114003] Published Mon Nov 26, 2018

Evolution of a shocked multimode interface with sharp corners

Physical Review Fluids - Mon, 11/26/2018 - 10:00

Author(s): Xu Guo, Juchun Ding, Xisheng Luo, and Zhigang Zhai

Evolution of a shocked inverse-chevron interface is studied experimentally, and the effect of vertex angle is highlighted. A new nonlinear model is constructed and provides a better prediction of interface growth than previous models.

[Phys. Rev. Fluids 3, 114004] Published Mon Nov 26, 2018

Steady two-dimensional free-surface flow over semi-infinite and finite-length corrugations in an open channel

Physical Review Fluids - Mon, 11/26/2018 - 10:00

Author(s): Jack S. Keeler, Benjamin J. Binder, and Mark G. Blyth

Steady free-surface flow over a semi-infinite and finite corrugated bottom is considered. It is demonstrated that by varying the Froude number a wide range of nontrivial solutions can be constructed, including generalized hydraulic falls, table-top solitons, and perturbed solitary waves.

[Phys. Rev. Fluids 3, 114804] Published Mon Nov 26, 2018

Experimental adventures in variable-density mixing

Physical Review Fluids - Wed, 11/21/2018 - 10:00

Author(s): Kathy Prestridge

Variable-density has important physical effects on turbulence, including driving mixing from small to large scales. Many compressible and variable-density flow applications cannot be simulated directly. Recent experimental measurements have implications for modeling and underresolved simulations.

[Phys. Rev. Fluids 3, 110501] Published Wed Nov 21, 2018

Particle-induced viscous fingering: Review and outlook

Physical Review Fluids - Wed, 11/21/2018 - 10:00

Author(s): Rui Luo, Yun Chen, and Sungyon Lee

When a mixture of noncolloidal particles and oil displaces air inside a Hele-Shaw cell, particles accumulate on the interface and cause fingering by generating an unstable viscosity gradient inside the suspension. A review and new data of the fingering onset and evolution are presented.

[Phys. Rev. Fluids 3, 110502] Published Wed Nov 21, 2018

Role of singularities in hydrodynamics

Physical Review Fluids - Wed, 11/21/2018 - 10:00

Author(s): J. Eggers

The image of a turbulent jet reveals complex spatial patterns, which result from the decay of turbulent eddies into smaller and smaller structures. Here we lay out a road map to describe such patterns as a result of singularities which possess both a nontrivial spatial structure, and exhibit instability as they progress toward smaller and smaller scales.

[Phys. Rev. Fluids 3, 110503] Published Wed Nov 21, 2018

Bubble puzzles: From fundamentals to applications

Physical Review Fluids - Wed, 11/21/2018 - 10:00

Author(s): Detlef Lohse

This paper sketches my personal scientific bubble journey, starting with single-bubble sonoluminescence, continuing with sound emission and scattering of bubbles, cavitation, snapping shrimp, impact events, air entrainment, and surface micro- and nanobubbles, and finally arriving at effective force models for bubbles and dispersed bubbly two-phase flow.

[Phys. Rev. Fluids 3, 110504] Published Wed Nov 21, 2018

Liquid fraction profile in a liquid foam under an applied voltage

Physical Review Fluids - Wed, 11/21/2018 - 10:00

Author(s): Anne-Laure Biance and Oriane Bonhomme

Liquid transport in a dry foam, a deformable porous material, in the presence of an applied electric field, is computed in the limits of rigid and mobile interfaces. The evolution of the liquid distribution is diffusive-like and significantly affected by the hydrodynamic boundary conditions.

[Phys. Rev. Fluids 3, 110505] Published Wed Nov 21, 2018

Revealing hidden information with quadratic products of acoustic field amplitudes

Physical Review Fluids - Wed, 11/21/2018 - 10:00

Author(s): David R. Dowling

Since the development of propagating-wave-based remote sensing more than a century ago, signal analysis has been limited to in-band recorded frequencies. However, this limitation is artificial. A new discovery from the realm of sonar shows that remote sensing is possible at out-of-band frequencies.

[Phys. Rev. Fluids 3, 110506] Published Wed Nov 21, 2018

Direct numerical simulations of premixed and stratified flame propagation in turbulent channel flow

Physical Review Fluids - Wed, 11/21/2018 - 10:00

Author(s): Andrea Gruber, Edward S. Richardson, Konduri Aditya, and Jacqueline H. Chen

Flashback is a key operational and safety issue for modern low-emission burners. With direct numerical simulations we study upstream flame movement through the turbulent flow within a channel and address the marked change in flashback behavior when the fuel and oxidant mixture is not homogeneous.

[Phys. Rev. Fluids 3, 110507] Published Wed Nov 21, 2018

Lubricated-to-frictional shear thickening scenario in dense suspensions

Physical Review Fluids - Wed, 11/21/2018 - 10:00

Author(s): Jeffrey F. Morris

A scenario in which shear thickening results from a transition of interactions between suspended particles from lubricated to frictional (LF) with increasing stress is described, with a presentation of primary results and a perspective on outstanding questions which are raised by the LF mechanism.

[Phys. Rev. Fluids 3, 110508] Published Wed Nov 21, 2018


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