Physical Review Fluids

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Recent articles in Physical Review Fluids
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Hydrodynamics and rheology of a vesicle doublet suspension

Thu, 10/10/2019 - 11:00

Author(s): Bryan Quaife, Shravan Veerapaneni, and Y.-N. Young

Effects of membrane-membrane adhesion on vesicle hydrodynamics are studied theoretically (using lubrication theory) and numerically (using time-adaptive boundary integral simulations). Novel vesicle dynamics are quantified to help design future microfluidic experiments to probe membrane adhesion.

[Phys. Rev. Fluids 4, 103601] Published Thu Oct 10, 2019

Influence of Langmuir adsorption and viscous fingering on transport of finite size samples in porous media

Thu, 10/10/2019 - 11:00

Author(s): Chinar Rana, Satyajit Pramanik, Michel Martin, A. De Wit, and Manoranjan Mishra

We combine two known independent phenomena, viscous fingering dynamics in miscible fluids and nonlinear wave fronts, to investigate how these two nonlinear dynamics interact. The difference between cases with/without nonlinear adsorption of solute arise in creation/annihilation of nonlinear waves.

[Phys. Rev. Fluids 4, 104001] Published Thu Oct 10, 2019

Inertial migration of a deformable particle in pipe flow

Thu, 10/10/2019 - 11:00

Author(s): Dhiya Alghalibi, Marco E. Rosti, and Luca Brandt

A study of the migration of a hyperelastic particle suspended in a Newtonian pipe flow for different Reynolds numbers and elasticity is presented. The particle deforms and undergoes a lateral displacement while traveling downstream through the pipe, finally focusing at the pipe centerline.

[Phys. Rev. Fluids 4, 104201] Published Thu Oct 10, 2019

How evaporation and condensation lead to self-oscillations in the single-branch pulsating heat pipe

Wed, 10/09/2019 - 11:00

Author(s): Albert Tessier-Poirier, Thomas Monin, Étienne Léveillé, Stéphane Monfray, Fabien Formosa, and Luc G. Fréchette

The physics behind the instability at the source of oscillations in a single-branch pulsating heat pipe is investigated. Oscillations produced by the resonator increase in amplitude when pressure induced by evaporation-condensation (positive feedback mechanism) overcomes the viscous losses (dissipation).

[Phys. Rev. Fluids 4, 103901] Published Wed Oct 09, 2019

Flow field evolution and entrainment in a free surface plunging jet

Wed, 10/09/2019 - 11:00

Author(s): Syed Harris Hassan, Tianqi Guo, and Pavlos P. Vlachos

An investigation finds that in free-surface plunging jets, shear layer vortices form right below the free surface, then develop and disintegrate faster than vortices in canonical free jets. This leads to shorter potential cores, faster decay of the mean centerline velocity, and enhanced liquid entrainment from the ambient.

[Phys. Rev. Fluids 4, 104603] Published Wed Oct 09, 2019

Thermoconvective instabilities in a horizontal porous annulus with an external wavy wall

Tue, 10/08/2019 - 11:00

Author(s): Jabrane Belabid

A numerical analysis reveals that the heat transfer inside a horizontal porous annulus filled with a saturated porous medium depends strongly on the waviness of the cold wall. Particular attention is paid to the influence of the waviness parameters on the thermoconvective instabilities.

[Phys. Rev. Fluids 4, 103501] Published Tue Oct 08, 2019

Experimental investigation of vertical turbulent transport of a passive scalar in a boundary layer: Statistics and visibility graph analysis

Tue, 10/08/2019 - 11:00

Author(s): G. Iacobello, M. Marro, L. Ridolfi, P. Salizzoni, and S. Scarsoglio

The dynamics of a passive scalar plume is experimentally studied in a rough-wall turbulent boundary layer. Besides classical statistics, complex networks are exploited to highlight the temporal structure of vertical turbulent transport series in terms of occurrence and intensity of extreme events.

[Phys. Rev. Fluids 4, 104501] Published Tue Oct 08, 2019

Energy-based analysis and anisotropic spectral distribution of internal gravity waves in strongly stratified turbulence

Tue, 10/08/2019 - 11:00

Author(s): Naoto Yokoyama and Masanori Takaoka

The weak turbulence of internal gravity waves and the strong turbulence of eddies coexist in stratified turbulence. The wave-number range of the anisotropic weak-wave turbulence is identified based on energy decomposition and characteristic time scales.

[Phys. Rev. Fluids 4, 104602] Published Tue Oct 08, 2019

Solutal convection induced by dissolution

Mon, 10/07/2019 - 11:00

Author(s): Julien Philippi, Michael Berhanu, Julien Derr, and Sylvain Courrech du Pont

The buoyancy instability occurring at the interface of a soluble body suddenly immersed in a quiescent solvent is explored. Numerical simulations are used to derive and confirm scaling laws based on a constant solutal Rayleigh number. Dissolution erosion rates are predicted in some geological situations.

[Phys. Rev. Fluids 4, 103801] Published Mon Oct 07, 2019

Sedimentation of a small sphere in stratified fluid

Mon, 10/07/2019 - 11:00

Author(s): Hojun Lee, Itzhak Fouxon, and Changhoon Lee

An extensive theoretical and numerical study of gravitational settling of small particles in a stratified fluid was performed. Adopting the integral equation on surface traction, we derived the drag enhancement due to stratification at low Reynolds and Peclet numbers, and confirmed with simulations.

[Phys. Rev. Fluids 4, 104101] Published Mon Oct 07, 2019

Statistical behavior of turbulent kinetic energy transport in boundary layer flashback of hydrogen-rich premixed combustion

Fri, 10/04/2019 - 11:00

Author(s): Umair Ahmed, Abhishek L. Pillai, Nilanjan Chakraborty, and Ryoichi Kurose

Statistical behavior of turbulent kinetic energy (TKE) transport in boundary layer flashback of hydrogen-rich premixed combustion is analyzed for the first time. Flame alters the structure of the turbulent boundary layer, which is evident from the changes in the budget of the TKE transport equation.

[Phys. Rev. Fluids 4, 103201] Published Fri Oct 04, 2019

Energy cascades in active-grid-generated turbulent flows

Fri, 10/04/2019 - 11:00

Author(s): D. O. Mora, E. Muñiz Pladellorens, P. Riera Turró, M. Lagauzere, and M. Obligado

An experimental study on active-grid-generated turbulence finds that different operating protocols can produce different energy cascades. Also, independently of the protocol, the turbulence dissipation constant can be modeled from the zero crossings of velocity fluctuations.

[Phys. Rev. Fluids 4, 104601] Published Fri Oct 04, 2019

Numerical analysis of electroconvection in cross-flow with unipolar charge injection

Tue, 10/01/2019 - 11:00

Author(s): Yifei Guan and Igor Novosselov

Electrohydrodynamic convection between parallel electrodes with unipolar injection is investigated numerically. A parameter Y, defined as the ratio of the local electric force to the viscous force, characterizes the stability of the flow system.

[Phys. Rev. Fluids 4, 103701] Published Tue Oct 01, 2019

Bubble merger in initial Richtmyer-Meshkov instability on inverse-chevron interface

Mon, 09/30/2019 - 11:00

Author(s): Xu Guo, Zhigang Zhai, Ting Si, and Xisheng Luo

Inverse-chevron interfaces with various initial amplitudes and wavelengths are used in shock tube experiments to study bubble competition in the Richtmyer-Meshkov instability. We find that width growth of the large interface is enhanced and that of the small interface is more affected and inhibited.

[Phys. Rev. Fluids 4, 092001(R)] Published Mon Sep 30, 2019

Stability of viscous fingering in lifted Hele-Shaw cells with a hole

Mon, 09/30/2019 - 11:00

Author(s): Sachin D. Kanhurkar, Vardhan Patankar, Tanveer ul Islam, Prasanna S. Gandhi, and Amitabh Bhattacharya

Theory, simulations, and experiments are used to study liquid-air interfacial instability of lifted Hele Shaw cells (LHSCs) with a hole in the center. The stability map provides a design framework for using multihole LHSCs to generate stable meshlike patterns in the liquid film.

[Phys. Rev. Fluids 4, 094003] Published Mon Sep 30, 2019

Diffused-interface Rayleigh-Taylor instability with a nonlinear equation of state

Mon, 09/30/2019 - 11:00

Author(s): Jason Olsthoorn, Edmund W. Tedford, and Gregory A. Lawrence

An investigation of the impact of a nonlinear equation of state on the evolution of the Rayleigh-Taylor instability is presented. The nonlinear density relation introduces asymmetry in the growing plumes about the density interface, preferentially generating kinetic energy in the lower layer.

[Phys. Rev. Fluids 4, 094501] Published Mon Sep 30, 2019

Effects of isothermal stratification strength on vorticity dynamics for single-mode compressible Rayleigh-Taylor instability

Thu, 09/26/2019 - 11:00

Author(s): Scott A. Wieland, Peter E. Hamlington, Scott J. Reckinger, and Daniel Livescu

The effects of initial stratification on single-mode Rayleigh-Taylor instability are examined using fully compressible wavelet-based direct numerical simulations. Such instabilities are widespread and are found in inertial confinement fusion, supernova ignition fronts, x-ray bursts, and geophysics.

[Phys. Rev. Fluids 4, 093905] Published Thu Sep 26, 2019

Fully resolved simulations of a stationary finite-sized particle in wall turbulence over a rough bed

Thu, 09/26/2019 - 11:00

Author(s): Xing Li, S. Balachandar, Hyungoo Lee, and Bofeng Bai

Direct numerical simulations are used to investigate forces on a stationary finite-sized particle in wall turbulence over a rough bed of hemispherical particles. Results show that lift is the main contributor of wall-normal force and can be well predicted with proper application of existing models.

[Phys. Rev. Fluids 4, 094302] Published Thu Sep 26, 2019

Stratified flow past a prolate spheroid

Wed, 09/25/2019 - 11:00

Author(s): Jose L. Ortiz-Tarin, K. C. Chongsiripinyo, and S. Sarkar

Simulation of density-stratified flow past an elongated body reveals substantial differences with respect to a sphere in flow separation, the near wake and internal waves. As stratification increases (Fr decreases), the fluid experiences vertical/sideways deflection and the separated region changes.

[Phys. Rev. Fluids 4, 094803] Published Wed Sep 25, 2019

Liquid plug formation in an airway closure model

Tue, 09/24/2019 - 11:00

Author(s): F. Romanò, H. Fujioka, M. Muradoglu, and J. B. Grotberg

A numerical study finds that bifrontal plug growth leading to the closure of a human lung airway induces high stress levels on the wall, which is the location of airway epithelial cells. Postcoalescence wall stresses can be from 300% to 600% greater than precoalescence values.

[Phys. Rev. Fluids 4, 093103] Published Tue Sep 24, 2019