Physical Review E
Multiscale velocity correlations in turbulence and Burgers turbulence: Fusion rules, Markov processes in scale, and multifractal predictions
Author(s): Jan Friedrich, Georgios Margazoglou, Luca Biferale, and Rainer Grauer
We compare different approaches towards an effective description of multiscale velocity field correlations in turbulence. Predictions made by the operator-product expansion, the so-called fusion rules, are placed in juxtaposition to an approach that interprets the turbulent energy cascade in terms o...
[Phys. Rev. E 98, 023104] Published Mon Aug 13, 2018
Author(s): Balachandra Suri, Jeffrey Tithof, Roman O. Grigoriev, and Michael F. Schatz
Recent studies suggest that unstable, nonchaotic solutions of the Navier-Stokes equation may provide deep insights into fluid turbulence. In this article, we present a combined experimental and numerical study exploring the dynamical role of unstable equilibrium solutions and their invariant manifol...
[Phys. Rev. E 98, 023105] Published Mon Aug 13, 2018
Author(s): B. Dinesh and S. Pushpavanam
The effect of a soluble surfactant on the linear stability of layered two-phase Poiseuille flows through soft-gel-coated parallel walls is studied in this paper. The focus is on determining the effect of the elastohydrodynamic coupling between the fluids and the soft-gel layers on the various flow i...
[Phys. Rev. E 98, 023106] Published Mon Aug 13, 2018
Author(s): Dan Coroian and Desiderio A. Vasquez
Reaction fronts described by the Kuramoto-Sivashinsky (KS) equation can exhibit complex behavior as they separate reacted from unreacted fluids. If the fluid of higher density is above a fluid of lower density, then the Rayleigh-Taylor instability can lead to fluid motion. In the reverse situation, ...
[Phys. Rev. E 98, 023102] Published Mon Aug 06, 2018
Author(s): Saurabh K. Maurya, Partha P. Gopmandal, S. Bhattacharyya, and H. Ohshima
A theoretical study on the electrophoresis of a soft particle made up of a charged hydrophobic inner core surrounded by polyelectrolyte layer (PEL) is made. The dielectric permittivity of the PEL and aqueous solution are considered to be different, which creates the ion partitioning effect. The ion ...
[Phys. Rev. E 98, 023103] Published Mon Aug 06, 2018
Author(s): Amal Roy, Anupam Gupta, and Samriddhi Sankar Ray
We study the rotational dynamics of inertial disks and rods in three-dimensional, homogeneous, isotropic turbulence. In particular, we show how the alignment and the decorrelation timescales of such spheroids depend, critically, on both the level of inertia and the aspect ratio of these particles. T...
[Phys. Rev. E 98, 021101(R)] Published Fri Aug 03, 2018
Author(s): Richard Blender, Denny Gohlke, and Frank Lunkeit
The atmosphere gains available potential energy by solar radiation and dissipates kinetic energy mainly in the atmospheric boundary layer. We analyze the fluctuations of the global mean energy cycle defined by Lorenz in a simulation with a simplified hydrostatic model. The energy current densities a...
[Phys. Rev. E 98, 023101] Published Fri Aug 03, 2018
Steady thermocapillary migration of a droplet in a uniform temperature gradient combined with a radiation energy source at large Marangoni numbers
Author(s): Zuo-Bing Wu
Steady thermocapillary droplet migration in a uniform temperature gradient combined with a radiation energy source at large Reynolds and Marangoni numbers is studied. To reach a terminal quasisteady process, the magnitude of the radiation energy source is required to preserve the conservative integr...
[Phys. Rev. E 98, 013110] Published Tue Jul 31, 2018
Magnetohydrodynamics- and magnetosolutal-transport-mediated evaporation dynamics in paramagnetic pendant droplets under field stimulus
Author(s): Vivek Jaiswal, Raghvendra Kumar Dwivedi, A. R. Harikrishnan, and Purbarun Dhar
Evaporation kinetics of pendant droplets is an area of immense importance in several applications, in addition to possessing rich fluid dynamics and thermal transport physics. This article experimentally and analytically sheds insight into the augmented evaporation dynamics of paramagnetic pendant d...
[Phys. Rev. E 98, 013109] Published Mon Jul 30, 2018
Author(s): G. Iacobello, S. Scarsoglio, J. G. M. Kuerten, and L. Ridolfi
A network-based analysis of a turbulent channel flow numerically solved at Reτ=180 is proposed as an innovative perspective for the spatial characterization of the flow field. Two spatial networks corresponding to the streamwise and wall-normal velocity components are built, where nodes represent po...
[Phys. Rev. E 98, 013107] Published Fri Jul 27, 2018
Cavitation in a liquid-filled cavity surrounded by an elastic medium: Intercoupling of cavitation events in neighboring cavities
Author(s): Alexander A. Doinikov, Benjamin Dollet, and Philippe Marmottant
The subject of the present theoretical study is the dynamics of a cavitation bubble in a spherical liquid-filled cavity surrounded by an infinite elastic solid. Two objectives are pursued. The first is to derive equations for the velocity and pressure fields throughout the liquid filling the cavity ...
[Phys. Rev. E 98, 013108] Published Fri Jul 27, 2018
Author(s): A. Khlifi, A. Salhi, S. Nasraoui, F. Godeferd, and C. Cambon
We study precessing turbulence, which appears in several geophysical and astrophysical systems, by direct numerical simulations of homogeneous turbulence where precessional instability is triggered due to the imposed background flow. We show that the time development of kinetic energy K occurs in tw...
[Phys. Rev. E 98, 011102(R)] Published Wed Jul 25, 2018
Author(s): Sanjeeva Balasuriya and Georg A. Gottwald
We consider the situation of a large-scale stationary flow subjected to small-scale fluctuations. Assuming that the stable and unstable manifolds of the large-scale flow are known, we quantify the mean behavior and stochastic fluctuations of particles close to the unperturbed stable and unstable man...
[Phys. Rev. E 98, 013106] Published Tue Jul 24, 2018
Author(s): A. L. Velikovich and J. L. Giuliani
The classic self-similar solutions of the nonstationary compressible Euler equations obtained for a blast-wave propagation (Sedov, Taylor, and von Neumann), a shock-wave implosion (Guderley, Landau, and Stanyukovich), or an impulsive loading of a planar target (von Hoerner, Häfele, and Zel’dovich) h...
[Phys. Rev. E 98, 013105] Published Thu Jul 19, 2018
Control of Rayleigh-Taylor instability onset time and convective velocity by differential diffusion effects
Author(s): S. S. Gopalakrishnan, J. Carballido-Landeira, B. Knaepen, and A. De Wit
Fingering instabilities of a miscible interface between two fluids in a gravitational field can develop due to adverse density gradients as in the well-known Rayleigh-Taylor (RT) and double-diffusive (DD) instabilities. In the absence of differential diffusion, the mixing rate and the onset time of ...
[Phys. Rev. E 98, 011101(R)] Published Tue Jul 17, 2018
Author(s): Soroush Aramideh, Pavlos P. Vlachos, and Arezoo M. Ardekani
Flow in porous media is known to be largely affected by pore morphology. In this work, we investigate the effects of pore geometry on the transport and spatial correlations of flow through porous media in two distinct pore structures arising from three-dimensional assemblies of overlapping and nonov...
[Phys. Rev. E 98, 013104] Published Fri Jul 13, 2018
Author(s): Arjang Shahriari, Preston S. Wilson, and Vaibhav Bahadur
At high temperatures, a droplet can rest on a cushion of its vapor (the Leidenfrost effect). Application of an electric field across the vapor gap fundamentally eliminates the Leidenfrost state by attracting liquid towards the surface. This study uses acoustic signature tracking to study electrostat...
[Phys. Rev. E 98, 013103] Published Thu Jul 12, 2018
Author(s): Hussein N. Dalgamoni and Xin Yong
Droplet-solid interaction is a ubiquitous fluid phenomenon that underpins a wide range of applications. To further the understanding of this important problem, we use an axisymmetric lattice Boltzmann method (LBM) to model the droplet impact on a solid surface with different wettability. The method ...
[Phys. Rev. E 98, 013102] Published Mon Jul 09, 2018
Controlling wetting with electrolytic solutions: Phase-field simulations of a droplet-conductor system
Author(s): Gaute Linga, Asger Bolet, and Joachim Mathiesen
The wetting properties of immiscible two-phase systems are crucial in applications ranging from laboratory-on-a-chip devices to field-scale oil recovery. It has long been known that effective wetting properties can be altered by the application of an electric field; a phenomenon coined as electrowet...
[Phys. Rev. E 98, 013101] Published Thu Jul 05, 2018
Author(s): Christopher Nilsen
We study the thermoviscous fingering instability problem that develops when an injected fluid is displacing a fluid with different temperature and viscosity in a Hele-Shaw cell or porous medium. Using linear stability theory, we show how the thermal front caused by the different temperature of the i...
[Phys. Rev. E 97, 063112] Published Fri Jun 29, 2018