Physical Review E
Author(s): Herve Nganguia, On Shun Pak, and Y.-N. Young
In this work we quantify the effects of surfactant transport on the deformation of a viscous drop under a DC electric field. We study how convective and diffusive transport of surfactants at drop surfaces influence the equilibrium and dynamic deformation of a leaky dielectric drop and a conducting d...
[Phys. Rev. E 99, 063104] Published Mon Jun 10, 2019
Minimal surfaces in porous media: Pore-scale imaging of multiphase flow in an altered-wettability Bentheimer sandstone
Author(s): Qingyang Lin, Branko Bijeljic, Steffen Berg, Ronny Pini, Martin J. Blunt, and Samuel Krevor
High-resolution x-ray imaging is used in combination with measurements of permeability and capillary pressure to study multiphase flow in a porous sample. The authors characterized interfaces between brine and oil in a sandstone sample under a variety of conditions. Similar experimental approaches could be useful for other studies.
[Phys. Rev. E 99, 063105] Published Mon Jun 10, 2019
Direct numerical simulation and Reynolds-averaged Navier-Stokes modeling of the sudden viscous dissipation for multicomponent turbulence
Author(s): Alejandro Campos and Brandon E. Morgan
Simulations of a turbulent multicomponent fluid mixture undergoing isotropic deformations are carried out to investigate the sudden viscous dissipation. This dissipative mechanism was originally demonstrated using simulations of an incompressible single-component fluid [S. Davidovits and N. J. Fisch...
[Phys. Rev. E 99, 063103] Published Wed Jun 05, 2019
Author(s): Benoît Pinier, Etienne Mémin, Sylvain Laizet, and Roger Lewandowski
There is no satisfactory model to explain the mean velocity profile of the whole turbulent layer in canonical wall-bounded flows. In this paper, a mean velocity profile expression is proposed for wall-bounded turbulent flows based on a recently proposed stochastic representation of fluid flows dynam...
[Phys. Rev. E 99, 063101] Published Mon Jun 03, 2019
Author(s): Mostafa Moradi, Mohammad Hassan Rahimian, and Seyed Farshid Chini
Coalescing water droplets on superhydrophobic surfaces can detach from the surface without the aid of any external forces. This self-propelled droplet detachment mechanism is useful in many applications, such as phase change heat transfer enhancement, self-cleaning surfaces, and anti-icing and antid...
[Phys. Rev. E 99, 063102] Published Mon Jun 03, 2019
Author(s): L. Novi, J. von Hardenberg, D. W. Hughes, A. Provenzale, and E. A. Spiegel
We numerically explore the dynamics of an incompressible fluid heated from below, bounded by free-slip horizontal plates and periodic lateral boundary conditions, subject to rapid rotation about a distant axis that is tilted with respect to the gravity vector. The angle ϕ between the rotation axis a...
[Phys. Rev. E 99, 053116] Published Tue May 28, 2019
Asymmetric time-cross-correlation of nonequilibrium concentration fluctuations in a ternary liquid mixture
Author(s): Doriano Brogioli, Fabrizio Croccolo, and Alberto Vailati
Equilibrium phenomena are characterized by time symmetry. Thermodynamic fluctuations are also time-symmetric at equilibrium. Conversely, diffusion of a solute in a liquid in the presence of a gradient is a nonequilibrium phenomenon, which gives rise to long-range fluctuations with amplitude much lar...
[Phys. Rev. E 99, 053115] Published Thu May 23, 2019
Author(s): Chenyue Xie, Jianchun Wang, Ke Li, and Chao Ma
A subgrid-scale (SGS) model for large-eddy simulation (LES) of compressible isotropic turbulence is constructed by using a data-driven framework. An artificial neural network (ANN) based on local stencil geometry is employed to predict the unclosed SGS terms. The input features are based on the firs...
[Phys. Rev. E 99, 053113] Published Tue May 21, 2019
Author(s): F. Nguyen, J.-P. Laval, P. Kestener, A. Cheskidov, R. Shvydkoy, and B. Dubrulle
It is still not known whether solutions to the Navier-Stokes equation can develop singularities from regular initial conditions. In particular, a classical and unsolved problem is to prove that the velocity field is Hölder continuous with some exponent h<1 (i.e., not necessarily differentiable) a...
[Phys. Rev. E 99, 053114] Published Tue May 21, 2019
Discontinuity in the sedimentation system with two particles having different densities in a vertical channel
Author(s): Deming Nie and Jianzhong Lin
The two-dimensional lattice Boltzmann method was used to numerically study a sedimentation system with two particles having different densities in a vertical channel for Galileo numbers in the range of 5≤Ga≤15 (resulting in a Reynolds number, based on the settling velocity, approximately ranging bet...
[Phys. Rev. E 99, 053112] Published Mon May 20, 2019
Author(s): Li Wang and Fang-bao Tian
Flow over a parallel cantilevered flag in the vicinity of a rigid wall is numerically studied using an immersed boundary–lattice Boltzmann method (IB–LBM) in two-dimensional domain, where the dynamics of the fluid and structure are, respectively, solved by the LBM and a finite-element method (FEM), ...
[Phys. Rev. E 99, 053111] Published Thu May 16, 2019
Author(s): Jie Zhang and Michel Benoit
Recently, the mechanism of Fabry-Perot (F-P) resonance in optics was extended to monochromatic water waves propagating in a domain with two patches of sinusoidal corrugations on an otherwise flat bottom. Assuming small-amplitude surface waves, an asymptotic linear analytical solution (ALAS) was deri...
[Phys. Rev. E 99, 053109] Published Wed May 15, 2019
Author(s): Diego Barba Maggi, Alejandro Boschan, Roman Martino, Marcelo Piva, and Jean-Christophe Géminard
We report on an experimental study of the Faraday instability in a vibrated fluid layer situated over a permeable and rough substrate, consisting either of a flat solid plate or of woven meshes having different openings and wire diameters, open or closed (by a sealing paint). We measure the critical...
[Phys. Rev. E 99, 053110] Published Wed May 15, 2019
Author(s): Panayiota Katsamba and Eric Lauga
Flexible filaments moving in viscous fluids are ubiquitous in the natural microscopic world. For example, the swimming of bacteria and spermatozoa as well as important physiological functions at organ level, such as the cilia-induced motion of mucus in the lungs, or individual cell level, such as ac...
[Phys. Rev. E 99, 053107] Published Mon May 13, 2019
Author(s): K. Ashoke Raman
Industrial applications that depend on jetting-based technology, such as painting or additive layered manufacturing, involve sequential deposition of droplets onto a moving surface. Spreading and receding dynamics of these impinging drops depend on the momentum transferred by the moving wall to the ...
[Phys. Rev. E 99, 053108] Published Mon May 13, 2019
Orthogonal wavelet multiresolution analysis of the turbulent boundary layer measured with two-dimensional time-resolved particle image velocimetry
Author(s): Guosheng He, Jinjun Wang, and Akira Rinoshika
The turbulent boundary layer flow measured by two-dimensional time-resolved particle image velocimetry is analyzed using the discrete orthogonal wavelet method. The Reynolds number of the turbulent boundary layer based on the friction velocity is Reτ=235. The flow field is decomposed into a number o...
[Phys. Rev. E 99, 053105] Published Thu May 09, 2019
Nonlinear dynamics of two coupled bubbles oscillating inside a liquid-filled cavity surrounded by an elastic medium
Author(s): Alexander A. Doinikov, Diane Bienaimé, S. Roberto Gonzalez-Avila, Claus-Dieter Ohl, and Philippe Marmottant
A theory is developed to model the nonlinear dynamics of two coupled bubbles inside a spherical liquid-filled cavity surrounded by an elastic medium. The aim is to study how the conditions of full confinement affect the coupled oscillations of the bubbles. To make the problem amenable to analytical ...
[Phys. Rev. E 99, 053106] Published Thu May 09, 2019
Author(s): T. Pestana and S. Hickel
Transition from a split to a forward kinetic energy cascade system is explored in the context of rotating turbulence using direct numerical simulations with a three-dimensional isotropic random force uncorrelated with the velocity field. Our parametric study covers confinement effects in high-aspect...
[Phys. Rev. E 99, 053103] Published Wed May 08, 2019
Author(s): Rinosh Polavarapu, Pamela Roach, and Arindam Banerjee
A rotating wheel experimental facility was developed to investigate incompressible Rayleigh-Taylor instability in elastic-plastic materials. A soft solid (mayonnaise) was chosen as the elastic-plastic material for experiments; material properties that include shear modulus and yield strength were fu...
[Phys. Rev. E 99, 053104] Published Wed May 08, 2019
Author(s): Qian Chen, Li Li, Yousheng Zhang, and Baolin Tian
The Richtmyer-Meshkov instability of small perturbed single-mode interfaces between an elastic-plastic solid and an inviscid liquid is investigated by theoretical analysis and numerical simulation in this work. A modified model including the Atwood number effect is proposed to describe the long-term...
[Phys. Rev. E 99, 053102] Published Mon May 06, 2019