Latest papers in fluid mechanics
Author(s): Yoav Green
Permselective nanochannels can rectify the electric current transported through them similar to solid-state diodes. The rectification is due to symmetry breaking related to distribution of the nanochannels’ surface charge as well as the geometry. Thus far, most of the works related to the asymmetric...
[Phys. Rev. E 98, 033114] Published Mon Sep 24, 2018
Surface modes with controlled axisymmetry triggered by bubble coalescence in a high-amplitude acoustic field
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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