Latest papers in fluid mechanics

Effects of axial boundary conductivity on a free Stewartson-Shercliff layer

Physical Review E - Wed, 06/20/2018 - 11:00

Author(s): Kyle J. Caspary, Dahan Choi, Fatima Ebrahimi, Erik P. Gilson, Jeremy Goodman, and Hantao Ji

The effects of axial boundary conductivity on the formation and stability of a magnetized free Stewartson-Shercliff layer (SSL) in a short Taylor-Couette device are reported. As the axial field increases with insulating endcaps, hydrodynamic Kelvin-Helmholtz-type instabilities set in at the SSLs of ...

[Phys. Rev. E 97, 063110] Published Wed Jun 20, 2018

Orientation dynamics of dilute functionalized graphene suspensions in oscillatory flow

Physical Review Fluids - Wed, 06/20/2018 - 11:00

Author(s): Giovanniantonio Natale, Naveen K. Reddy, Robert K. Prud'homme, and Jan Vermant

Orientation dynamics of graphene suspensions is investigated in oscillatory shear flow via flow dichroism. To evaluate whether graphene sheets behave as flexible or rigid sheets during flow, the experimental data are compared with predictions from a single particle Smoluchowski equation for spheroids.

[Phys. Rev. Fluids 3, 063303] Published Wed Jun 20, 2018

Unified decomposition method to study Rayleigh-Taylor instability in liquids and solids

Physical Review E - Tue, 06/19/2018 - 11:00

Author(s): Y. B. Sun, J. J. Tao, and X. T. He

In the previous studies of Rayleigh-Taylor instability, different methods were used to consider the effects of elasticity, viscosity, and magnetic fields. In this paper, a unified method, which was first used for fluids, is validated for different physical models, where the unstable mode is decompos...

[Phys. Rev. E 97, 063109] Published Tue Jun 19, 2018

Stability of melt flow during magnetic sonication in a floating zone configuration

Physical Review Fluids - Tue, 06/19/2018 - 11:00

Author(s): I. Grants and G. Gerbeth

Combined static and alternating magnetic fields are shown to create an oscillating pressure that can cause cavitation in molten metals. A time-averaged flow is also excited, consisting of two tori squeezed to thin boundary layers. Flow instability develops as a standing wave between these tori.

[Phys. Rev. Fluids 3, 063902] Published Tue Jun 19, 2018

Directional change of tracer trajectories in rotating Rayleigh-Bénard convection

Physical Review E - Mon, 06/18/2018 - 11:00

Author(s): Kim M. J. Alards, Hadi Rajaei, Rudie P. J. Kunnen, Federico Toschi, and Herman J. H. Clercx

The angle of directional change of tracer trajectories in rotating Rayleigh-Bénard convection is studied as a function of the time increment τ between two instants of time along the trajectories, both experimentally and with direct numerical simulations. Our aim is to explore the geometrical charact...

[Phys. Rev. E 97, 063105] Published Mon Jun 18, 2018

Cross-stream migration of drops suspended in Poiseuille flow in the presence of an electric field

Physical Review E - Mon, 06/18/2018 - 11:00

Author(s): Binita Nath, Gautam Biswas, Amaresh Dalal, and Kirti Chandra Sahu

The present study focuses on the cross-stream migration of a neutrally buoyant two-dimensional drop in a Poiseuille flow in a channel under the influence of an electric field. In the absence of an electric field, the important nondimensional parameters describing this problem are the viscosity ratio...

[Phys. Rev. E 97, 063106] Published Mon Jun 18, 2018

Networked-oscillator-based modeling and control of unsteady wake flows

Physical Review E - Mon, 06/18/2018 - 11:00

Author(s): Aditya G. Nair, Steven L. Brunton, and Kunihiko Taira

A networked-oscillator-based analysis is performed to examine and control the transfer of kinetic energy for periodic bluff body flows. The dynamics of energy fluctuations in the flow field are described by a set of oscillators defined by conjugate pairs of spatial proper orthogonal decomposition (P...

[Phys. Rev. E 97, 063107] Published Mon Jun 18, 2018

Magnetic energy transient growth in the subcritical Kazantsev model

Physical Review E - Mon, 06/18/2018 - 11:00

Author(s): Egor Yushkov, Alexander Lukin, and Dmitry Sokoloff

We study average magnetic field growth in a mirror-symmetrical Kazantsev turbulent flow near the dissipative scales. Our main attention is directed to a subcritical regime, when an exponential decrease of magnetic energy is usually expected. We show that instead of damping, transient energy growth c...

[Phys. Rev. E 97, 063108] Published Mon Jun 18, 2018

Microtransformers: Controlled microscale navigation with flexible robots

Physical Review Fluids - Mon, 06/18/2018 - 11:00

Author(s): Thomas D. Montenegro-Johnson

Janus-like rods which can be externally switched between straight, U, and S shapes give the possibility of steering individual rods within a group through a complex geometry.

[Phys. Rev. Fluids 3, 062201(R)] Published Mon Jun 18, 2018

Role of hydrodynamic shear layer stability in driving combustion instability in a premixed propane-air backward-facing step combustor

Physical Review Fluids - Mon, 06/18/2018 - 11:00

Author(s): Santosh Hemchandra, Santosh Shanbhogue, Seunghyuck Hong, and Ahmed F. Ghoniem

With numerical methods and analysis of existing experimental results we show that combustion instability in a backward-facing step combustor can be maintained either with weak coupling between acoustic and hydrodynamic modes (semi-open loop) or with strong coupling (fully closed loop).

[Phys. Rev. Fluids 3, 063201] Published Mon Jun 18, 2018

Effects of finite spatial and temporal resolution in direct numerical simulations of incompressible isotropic turbulence

Physical Review Fluids - Mon, 06/18/2018 - 11:00

Author(s): P. K. Yeung, K. R. Sreenivasan, and S. B. Pope

A study combining spectral filtering and numerical simulations at enhanced spatial and/or temporal resolution is used to clarify the proper scaling of dissipation and enstrophy in forced incompressible isotropic turbulence.

[Phys. Rev. Fluids 3, 064603] Published Mon Jun 18, 2018

Wall slip of complex fluids: Interfacial friction versus slip length

Physical Review Fluids - Fri, 06/15/2018 - 11:00

Author(s): Benjamin Cross, Chloé Barraud, Cyril Picard, Liliane Léger, Frédéric Restagno, and Élisabeth Charlaix

Experiments with a complex fluid in an oscillating atomic force microscope find that the wall slip is well characterised by a real Navier interfacial friction coefficient instead of the usual slip height.

[Phys. Rev. Fluids 3, 062001(R)] Published Fri Jun 15, 2018

From hindered to promoted settling in dispersions of attractive colloids: Simulation, modeling, and application to macromolecular characterization

Physical Review Fluids - Fri, 06/15/2018 - 11:00

Author(s): Andrew M. Fiore, Gang Wang, and James W. Swan

Immersed boundary simulations are used to study settling in dispersions of sticky colloids and to develop an empirical model for the settling rate that is in good agreement with experiments. The model is applied to characterize attractive interactions in concentrated macromolecular solutions.

[Phys. Rev. Fluids 3, 063302] Published Fri Jun 15, 2018

Theoretical and experimental investigation of forward spatter of blood from a gunshot

Physical Review Fluids - Fri, 06/15/2018 - 11:00

Author(s): P. M. Comiskey, A. L. Yarin, and D. Attinger

A theoretical model predicts forward blood spatter from a 9-mm bullet and favorably agrees with experimental data. Blood drop generation is explained through chaotic liquid disintegration built in the framework of percolation theory.

[Phys. Rev. Fluids 3, 063901] Published Fri Jun 15, 2018

Propagating helical waves as a building block of round turbulent jets

Physical Review Fluids - Thu, 06/14/2018 - 11:00

Author(s): R. I. Mullyadzhanov, R. D. Sandberg, S. S. Abdurakipov, W. K. George, and K. Hanjalić

In direct numerical simulations of a turbulent jet, propagating helical waves which contain much of the energy are tracked from the near to the far field in order to find their scaling properties and dispersion laws.

[Phys. Rev. Fluids 3, 062601(R)] Published Thu Jun 14, 2018

Wetting dynamics in two-liquid systems: Effect of the surrounding phase viscosity

Physical Review E - Wed, 06/13/2018 - 11:00

Author(s): P. Bazazi, A. Sanati-Nezhad, and S. H. Hejazi

This paper reports the experimental results of a water droplet spreading on a glass substrate submerged in an oil phase. The radius of the wetted area grows exponentially over time forming two distinct regimes. The early time dynamics of wetting is characterized with the time exponent of 1, referred...

[Phys. Rev. E 97, 063104] Published Wed Jun 13, 2018

Announcement: PRFluids Editors' Suggestions

Physical Review Fluids - Wed, 06/13/2018 - 11:00

[Phys. Rev. Fluids 3, 060001] Published Wed Jun 13, 2018

Granular collapse in a fluid: Different flow regimes for an initially dense-packing

Physical Review Fluids - Wed, 06/13/2018 - 11:00

Author(s): Alexis Bougouin and Laurent Lacaze

The collapse of a granular column in a fluid shows that both the dynamics and the deposit shape depend on the aspect ratio, Stokes number, and grain-fluid density ratio. Classification of flow regimes and characterization of the associated dynamics are proposed through an experimental investigation.

[Phys. Rev. Fluids 3, 064305] Published Wed Jun 13, 2018

Numerical simulation of cavitation and atomization using a fully compressible three-phase model

Physical Review Fluids - Tue, 06/12/2018 - 11:00

Author(s): Murali-Girija Mithun, Phoevos Koukouvinis, and Manolis Gavaises

A fully compressible three-phase cavitation model is developed to study the interaction between the cavitation and primary atomization. The simulations reveal that the developing cavitation condition with cyclic air entrainment is the most favourable condition for primary atomization.

[Phys. Rev. Fluids 3, 064304] Published Tue Jun 12, 2018

Three-dimensionality of one- and two-layer electromagnetically driven thin-layer flows

Physical Review Fluids - Tue, 06/12/2018 - 11:00

Author(s): Jeffrey Tithof, Benjamin C. Martell, and Douglas H. Kelley

Two-dimensional flow is often approximated by driving thin fluid layers electromagnetically. By comparing three common experimental configurations, it is shown that the single-layer and immiscible configurations minimize out-of-plane flow over a wider range of Reynolds numbers than miscible configurations.

[Phys. Rev. Fluids 3, 064602] Published Tue Jun 12, 2018


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