Latest papers in fluid mechanics

Surface modes with controlled axisymmetry triggered by bubble coalescence in a high-amplitude acoustic field

Physical Review E - Mon, 09/24/2018 - 11:00

Author(s): Sarah Cleve, Matthieu Guédra, Claude Inserra, Cyril Mauger, and Philippe Blanc-Benon

When two bubbles encounter each other in a moderate ultrasound field they coalesce into a single bubble that shows purely spherical oscillations. For a sufficiently large acoustic field, this coalescence can lead to sustained nonspherical oscillations of the resulting bubble. We experimentally captu...

[Phys. Rev. E 98, 033115] Published Mon Sep 24, 2018

Renormalization of viscosity in wavelet-based model of turbulence

Physical Review E - Mon, 09/24/2018 - 11:00

Author(s): M. V. Altaisky, M. Hnatich, and N. E. Kaputkina

Statistical theory of turbulence in viscid incompressible fluid, described by the Navier-Stokes equation driven by random force, is reformulated in terms of scale-dependent fields ua(x), defined as wavelet-coefficients of the velocity field u taken at point x with the resolution a. Applying quantum ...

[Phys. Rev. E 98, 033116] Published Mon Sep 24, 2018

Direct numerical simulation of particle sedimentation in a Bingham fluid

Physical Review Fluids - Mon, 09/24/2018 - 11:00

Author(s): A. R. Koblitz, S. Lovett, and N. Nikiforakis

Two-dimensional numerical simulations of a suspension of sedimenting particles in a Bingham fluid find three possible regimes: all, a fraction, and none of the particles sedimenting.

[Phys. Rev. Fluids 3, 093302] Published Mon Sep 24, 2018

Viscous fingering of a draining suspension

Physical Review Fluids - Mon, 09/24/2018 - 11:00

Author(s): Yun Chen, Frank Malambri, and Sungyon Lee

Viscous fingering arises as air invades a draining viscous suspension. Experiments show that suspended particles delay the onset of fingering but also accelerate its growth rate. In addition, particles of select sizes are observed to coat the channel surfaces and not drain.

[Phys. Rev. Fluids 3, 094001] Published Mon Sep 24, 2018

Confinement effects on gravity-capillary wave turbulence

Physical Review Fluids - Mon, 09/24/2018 - 11:00

Author(s): Roumaissa Hassaini and Nicolas Mordant

The effect of confinement in a high-aspect-ratio channel on the statistical properties of weak turbulence of gravity-capillary waves at the surface of water is investigated. Discreteness due to confinement coexists with an almost one-dimensional kinetic sort of wave turbulence.

[Phys. Rev. Fluids 3, 094805] Published Mon Sep 24, 2018

Rolling and slipping of droplets on superhydrophobic surfaces

Physical Review E - Fri, 09/21/2018 - 11:00

Author(s): A. F. W. Smith, K. Mahelona, and S. C. Hendy

The leaves of many plants are superhydrophobic, a property that may have evolved to clean the leaves by encouraging water droplets to bead up and roll off. Superhydrophobic surfaces can also exhibit reduced friction, and liquids flowing over such surfaces have been found to slip in apparent violatio...

[Phys. Rev. E 98, 033113] Published Fri Sep 21, 2018

Membrane filtration with complex branching pore morphology

Physical Review Fluids - Fri, 09/21/2018 - 11:00

Author(s): Pejman Sanaei and Linda J. Cummings

An idealized first-principles model describing filtration of a feed solution containing small particles in a microstructured porous membrane is presented. Optimal configurations for the pore microstructure are identified in terms of maximizing throughput of filtered fluid and filter lifetime.

[Phys. Rev. Fluids 3, 094305] Published Fri Sep 21, 2018

Inertioelastic Poiseuille flow over a wavy surface

Physical Review Fluids - Fri, 09/21/2018 - 11:00

Author(s): Simon J. Haward, Jacob Page, Tamer A. Zaki, and Amy Q. Shen

Experimental evidence is presented for the existence of critical layers in inertioelastic shear flows over wavy surfaces, where theory predicts amplification of the spanwise vorticity.

[Phys. Rev. Fluids 3, 091302(R)] Published Fri Sep 21, 2018

Scaling laws of top jet drop size and speed from bubble bursting including gravity and inviscid limit

Physical Review Fluids - Thu, 09/20/2018 - 11:00

Author(s): Alfonso M. Gañán-Calvo

Scaling laws are proposed for the size and the velocity of the droplet which is ejected when a bubble rises to a free surface and bursts. These new scalings consistently incorporate the effect of gravity and the limit of negligible viscosity of the liquid.

[Phys. Rev. Fluids 3, 091601(R)] Published Thu Sep 20, 2018

Onset of three-dimensionality in supersonic flow over a slender double wedge

Physical Review Fluids - Wed, 09/19/2018 - 11:00

Author(s): Sidharth GS, Anubhav Dwivedi, Graham V. Candler, and Joseph W. Nichols

An investigation shows that laminar supersonic flow on a 2D compression corner can destabilize to become 3D beyond a critical turn angle. This compressible instability resides in the recirculating flow, producing spiral wall flow patterns postseparation and wall temperature streaks downstream.

[Phys. Rev. Fluids 3, 093901] Published Wed Sep 19, 2018

Large-eddy simulation of turbulent flow over spanwise-offset barchan dunes: Interdune vortex stretching drives asymmetric erosion

Physical Review E - Tue, 09/18/2018 - 11:00

Author(s): Chao Wang and William Anderson

The coupling between turbulent flow physics and barchan dune geometry is important to dune migration, morphology of individual dunes, and the morphodynamics of merging and separating proximal dunes. Large-eddy simulation was used to model turbulent, inertial-dominated flow over a series of static ba...

[Phys. Rev. E 98, 033112] Published Tue Sep 18, 2018

Turbulent/nonturbulent interfaces in high-resolution direct numerical simulation of temporally evolving compressible turbulent boundary layers

Physical Review Fluids - Tue, 09/18/2018 - 11:00

Author(s): Xinxian Zhang, Tomoaki Watanabe, and Koji Nagata

Turbulent-nonturbulent interfaces are studied in temporally evolving subsonic and supersonic turbulent boundary layers by comparing the results of direct numerical simulations with the entrainment model based on a single vortex and the theory for spatially evolving boundary layers.

[Phys. Rev. Fluids 3, 094605] Published Tue Sep 18, 2018

Wake behind a concave curved cylinder

Physical Review Fluids - Tue, 09/18/2018 - 11:00

Author(s): Fengjian Jiang, Bjørnar Pettersen, Helge I. Andersson, Jongmin Kim, and Sungtae Kim

The wake behind a concave, curved cylinder configuration is investigated at different Reynolds numbers. Distinctly different wake flow regimes were observed in the computed flow field, including oblique vortex shedding and dislocations. The crucial influence of a straight vertical extension is explored.

[Phys. Rev. Fluids 3, 094804] Published Tue Sep 18, 2018

Enstrophy spectrum in freely decaying two-dimensional self-similar turbulent flow

Physical Review E - Mon, 09/17/2018 - 11:00

Author(s): Igor Vigdorovich

We consider freely decaying two-dimensional homogeneous and isotropic turbulent motion in a self-similar limit that is achieved at large Reynolds numbers based on time and the mean kinetic energy of the flow provided that initial average enstrophy tends to infinity as fluid viscosity tens to zero. I...

[Phys. Rev. E 98, 033110] Published Mon Sep 17, 2018

Large-eddy simulation and Reynolds-averaged Navier-Stokes modeling of a reacting Rayleigh-Taylor mixing layer in a spherical geometry

Physical Review E - Mon, 09/17/2018 - 11:00

Author(s): Brandon E. Morgan, Britton J. Olson, Wolfgang J. Black, and Jacob A. McFarland

Tenth-order compact difference code Miranda is used to perform large-eddy simulation (LES) of a hydrogen gas–plastic mixing layer in a spherical geometry. Once the mixing layer has achieved self-similar growth, it is heated to 1 keV, and the second-order arbitrary Lagrangian-Eulerian (ALE) code Ares...

[Phys. Rev. E 98, 033111] Published Mon Sep 17, 2018

Inertia-driven jetting regimes in microfluidic coflows

Physical Review Fluids - Mon, 09/17/2018 - 11:00

Author(s): Fan Zhang, Arnaud Erriguible, Théo Gavoille, Michaël T. Timko, and Samuel Marre

Inertial breakup modes are identified at microscale for co-flowing jets using a high-pressure mixer.

[Phys. Rev. Fluids 3, 092201(R)] Published Mon Sep 17, 2018

Normal shocks with high upstream pressure

Physical Review Fluids - Mon, 09/17/2018 - 11:00

Author(s): William A. Sirignano

A normal compressive shock with upstream pressure from 10 to 500 bar is analyzed for density, enthalpy, entropy, and velocity with nitrogen, oxygen, argon, and carbon dioxide. New descriptions for sound speed, Prandtl’s relation, the Rankine-Hugoniot relation, and Riemann invariants are presented.

[Phys. Rev. Fluids 3, 093401] Published Mon Sep 17, 2018

Visualization and analysis of magnetothermal convection of paramagnetic liquid in the Rayleigh-Benard model

Physical Review E - Wed, 09/12/2018 - 11:00

Author(s): Syou Maki, Noriyuki Hirota, and Masayuki Hagiwara

We examined the heat transfer of magnetothermal convection in a Rayleigh-Benard model (height 9.2 mm, vessel diameter 20 mm, aspect ratio 2.17). The working fluid was an aqueous gadolinium nitrate solution of 0.15 mol/kg (pH=4.52 at 305.5 K, paramagnetic substance). Not only the magnetic body force ...

[Phys. Rev. E 98, 033109] Published Wed Sep 12, 2018

Rayleigh-Taylor turbulence with singular nonuniform initial conditions

Physical Review Fluids - Wed, 09/12/2018 - 11:00

Author(s): L. Biferale, G. Boffetta, A. A. Mailybaev, and A. Scagliarini

Three-dimensional direct numerical simulations of Rayleigh-Taylor turbulence with various initial unstable temperature distributions finds a modified self-similar mixing in the long term.

[Phys. Rev. Fluids 3, 092601(R)] Published Wed Sep 12, 2018

Collisions of drops with an immiscible liquid jet

Physical Review Fluids - Wed, 09/12/2018 - 11:00

Author(s): Carole Planchette, Sylvain Petit, Hannes Hinterbichler, and Günter Brenn

The collisions of a drop stream with an immiscible jet are experimentally studied revealing the formation of several complex structures classified in four main regimes. When neither the drops nor the jet fragment,“drops in jet” are observed that could be hardened to produce advanced fibers.

[Phys. Rev. Fluids 3, 093603] Published Wed Sep 12, 2018


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