# Physical Review E

*Updated:*2 days 19 hours ago

### Dynamics of bubbles under stochastic pressure forcing

Author(s): Riccardo Vesipa, Eleonora Paissoni, Costantino Manes, and Luca Ridolfi

Several studies have investigated the dynamics of a single spherical bubble at rest under a nonstationary pressure forcing. However, attention has almost always been focused on periodic pressure oscillations, neglecting the case of stochastic forcing. This fact is quite surprising, as random pressur...

[Phys. Rev. E 103, 023108] Published Tue Feb 23, 2021

### Stability analysis of a thinning electrified jet under nonisothermal conditions

Author(s): Dharmansh Deshawar and Paresh Chokshi

The linear stability of a jet propagating under an electric field is analyzed under nonisothermal conditions. The electrified jet of a Newtonian fluid is modeled as a slender filament, and the leaky dielectric model is used to account for the Maxwell stresses within the fluid. The convective heat tr...

[Phys. Rev. E 103, 023107] Published Mon Feb 22, 2021

### Theoretical analysis of quantum turbulence using the Onsager ideal turbulence theory

Author(s): Tomohiro Tanogami

We investigate three-dimensional quantum turbulence as described by the Gross-Pitaevskii model using the analytical method exploited in the Onsager “ideal turbulence” theory. We derive the scale independence of the scale-to-scale kinetic energy flux and establish a double-cascade scenario: At scales...

[Phys. Rev. E 103, 023106] Published Thu Feb 18, 2021

### Rayleigh-Taylor instability in elastic-plastic solid slabs bounded by a rigid wall

Author(s): S. A. Piriz, A. R. Piriz, N. A. Tahir, S. Richter, and M. Bestehorn

The linear evolution of the incompressible Rayleigh-Taylor instability for the interface between an elastic-plastic slab medium and a lighter semi-infinite ideal fluid beneath the slab is developed for the case in which slab is attached to a rigid wall at the top surface. The theory yields the maps ...

[Phys. Rev. E 103, 023105] Published Wed Feb 10, 2021

### Characterizing pore-scale structure-flow correlations in sedimentary rocks using magnetic resonance imaging

Author(s): K. Karlsons, D. W. de Kort, A. J. Sederman, M. D. Mantle, J. J. Freeman, M. Appel, and L. F. Gladden

Quantitative, three-dimensional (3D) spatially resolved magnetic resonance flow imaging (flow MRI) methods are presented to characterize structure-flow correlations in a 4-mm-diameter plug of Ketton limestone rock using undersampled **k**- and **q**-space data acquisition methods combined with compressed se...

[Phys. Rev. E 103, 023104] Published Tue Feb 09, 2021

### How <i>Euglena gracilis</i> swims: Flow field reconstruction and analysis

Author(s): Nicola Giuliani, Massimiliano Rossi, Giovanni Noselli, and Antonio DeSimone

*Euglena gracilis* is a unicellular organism that swims by beating a single anterior flagellum. We study the nonplanar waveforms spanned by the flagellum during a swimming stroke and the three-dimensional flows that they generate in the surrounding fluid. Starting from a small set of time-indexed imag...

[Phys. Rev. E 103, 023102] Published Mon Feb 08, 2021

### Mechanism of hysteresis in shock wave reflection

Author(s): Yan-Chao Hu (胡延超), Wen-Feng Zhou (周文丰), Zhi-Gong Tang (唐志共), Yan-Guang Yang (杨彦广), and Zhao-Hu Qin (秦兆虎)

This paper reports on the mechanism of the hysteresis in the transition between regular and Mach shock wave reflections. We disclose that, for a given inflow Mach number, a stable reflection configuration should maintain the minimal dissipation. As the wedge angle varies, the set of the minimal diss...

[Phys. Rev. E 103, 023103] Published Mon Feb 08, 2021

### Squirt flow in porous media saturated by Maxwell-type non-Newtonian fluids

Author(s): Santiago G. Solazzi, Beatriz Quintal, and Klaus Holliger

Mechanical waves, which are commonly employed for the noninvasive characterization of fluid-saturated porous media, tend to induce pore-scale fluid pressure gradients. The corresponding fluid pressure relaxation process is commonly referred to as squirt flow and the associated viscous dissipation ca...

[Phys. Rev. E 103, 023101] Published Mon Feb 01, 2021

### Dynamic fluid configurations in steady-state two-phase flow in Bentheimer sandstone

Author(s): Ying Gao, Ali Q. Raeini, Martin J. Blunt, and Branko Bijeljic

Fast synchrotron tomography is used to study the impact of capillary number, Ca, on fluid configurations in steady-state two-phase flow in porous media. Brine and n-decane were co-injected at fixed fractional flow, fw=0.5, in a cylindrical Bentheimer sandstone sample for a range of capillary numbers...

[Phys. Rev. E 103, 013110] Published Mon Jan 25, 2021

### Tear-film breakup: The role of membrane-associated mucin polymers

Author(s): Anjishnu Choudhury, Mohar Dey, Harish N. Dixit, and James J. Feng

Mucin polymers in the tear film protect the corneal surface from pathogens and modulate the tear-film flow characteristics. Recent studies have suggested a relationship between the loss of membrane-associated mucins and premature rupture of the tear film in various eye diseases. This work aims to el...

[Phys. Rev. E 103, 013108] Published Wed Jan 20, 2021

### Hydrodynamic interactions between swimming microorganisms in a linearly density stratified fluid

Author(s): Rishabh V. More and Arezoo M. Ardekani

Oceans and lakes sustain intense biological activity due to the motion of marine organisms, which has significant ecological and environmental impacts. The motion of individual organisms and their interactions with each other play a significant role in the collective motion of swimming organisms. Ho...

[Phys. Rev. E 103, 013109] Published Wed Jan 20, 2021

### Molecular viscosity and diffusivity effects in transitional and shock-driven mixing flows

Author(s): F. S. Pereira, F. F. Grinstein, D. M. Israel, and R. Rauenzahn

This paper investigates the importance of molecular viscosity and diffusivity for the prediction of transitional and shock-driven mixing flows featuring high and low Reynolds and Mach number regions. Two representative problems are computed with implicit large-eddy simulations using the inviscid Eul...

[Phys. Rev. E 103, 013106] Published Tue Jan 19, 2021

### Compressibility effects in turbulent transport of the temperature field

Author(s): I. Rogachevskii and N. Kleeorin

Compressibility effects in a turbulent transport of temperature field are investigated by applying the quasilinear approach for small Péclet numbers and the spectral τ approach for large Péclet numbers. The compressibility of a fluid flow reduces the turbulent diffusivity of the mean temperature fie...

[Phys. Rev. E 103, 013107] Published Tue Jan 19, 2021

### Interaction between two unequal particles at intermediate Reynolds numbers: A pattern of horizontal oscillatory motion

Author(s): Deming Nie, Geng Guan, and Jianzhong Lin

The two-dimensional lattice Boltzmann method (LBM) was used to study the motion of two interacting particles with different densities (ρ1 and ρ2) and diameters (d1 and d2), which were placed in a vertical channel under gravity. Both the density ratio (λ=ρ2/ρ1) and diameter ratio (r=d2/d1) between th...

[Phys. Rev. E 103, 013105] Published Thu Jan 14, 2021

### Odd-viscosity-induced instability of a falling thin film with an external electric field

Author(s): Gaowa Bao and Yongjun Jian

The influence of odd viscosity of Newtonian fluid on the instability of thin film flowing along an inclined plane under a normal electric field is studied. By odd viscosity, we mean apart from the well-known coefficient of shear viscosity, a classical liquid with broken time-reversal symmetry is end...

[Phys. Rev. E 103, 013104] Published Wed Jan 13, 2021

### Tuning a magnetic field to generate spinning ferrofluid droplets with controllable speed via nonlinear periodic interfacial waves

Author(s): Zongxin Yu and Ivan C. Christov

Two-dimensional free surface flows in Hele-Shaw configurations are a fertile ground for exploring nonlinear physics. Since Saffman and Taylor's work on linear instability of fluid-fluid interfaces, significant effort has been expended to determining the physics and forcing that set the linear growth...

[Phys. Rev. E 103, 013103] Published Tue Jan 12, 2021

### Dissolution dynamics of a vertically confined sessile droplet

Author(s): Saptarshi Basu, D. Chaitanya Kumar Rao, Ankur Chattopadhyay, and Joita Chakraborty

We experimentally investigate the dissolution of microscale sessile alcohol droplets in water under the influence of impermeable vertical confinement. The introduction of confinement suppresses the mass transport from the droplet to bulk medium in comparison with the nonconfined counterpart. Along w...

[Phys. Rev. E 103, 013101] Published Tue Jan 05, 2021

### Rayleigh-Brillouin scattering in binary mixtures of disparate-mass constituents: ${\mathrm{SF}}_{6}\text{−}\mathrm{He},\phantom{\rule{0.16em}{0ex}}{\mathrm{SF}}_{6}\text{−}{\mathrm{D}}_{2}$, and ${\mathrm{SF}}_{6}\text{−}{\mathrm{H}}_{2}$

Author(s): Yuanqing Wang, Wim Ubachs, Cesar A. M. de Moraes, and Wilson Marques, Jr.

The spectral distribution of light scattered by microscopic thermal fluctuations in binary mixture gases was investigated experimentally and theoretically. Measurements of Rayleigh-Brillouin spectral profiles were performed at a wavelength of 532 nm and at room temperature, for mixtures of SF6−He,SF...

[Phys. Rev. E 103, 013102] Published Tue Jan 05, 2021

### Inertial migration of a deformable capsule in an oscillatory flow in a microchannel

Author(s): Ali Lafzi, Amir Hossein Raffiee, and Sadegh Dabiri

Dynamics of a deformable capsule in an oscillatory flow of a Newtonian fluid in a microchannel has been studied numerically. The effects of oscillation frequency, capsule deformability, and channel flow rate have been explored by simulating the capsule within a microchannel. In addition, the simulat...

[Phys. Rev. E 102, 063110] Published Wed Dec 30, 2020

### Strong shock as a stringent test for Onsager-Burnett equations

Author(s): Ravi Sudam Jadhav and Amit Agrawal

A new set of thermodynamically consistent Onsager-Burnett equations [Singh, Jadhav, and Agrawal, Phys. Rev. E **96**, 013106 (2017)] has recently been derived. In this work, we subject these equations to a severe test case of strong shock (Mach number = 134) for a dilute gas system composed of hard-sphe...

[Phys. Rev. E 102, 063111] Published Wed Dec 30, 2020