Latest papers in fluid mechanics
Author(s): Xiaoliang He, Sourabh Apte, Kai Schneider, and Benjamin Kadoch
The physics of turbulent flow in porous media is explored in the Lagrangian frame. The evolution of curvature angles along the fluid trajectories reveals the multiscale nature of turbulence. The asymptotic value of the curvature angle quantifies the effect of geometric confinement on turbulence.
[Phys. Rev. Fluids 3, 084501] Published Thu Aug 02, 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
Author(s): Elise Alméras, Frédéric Risso, Véronique Roig, Cécile Plais, and Frédéric Augier
A large-scale model for transport by secondary open wakes is proposed to describe the spatiotemporal evolution of the concentration field in a homogeneous bidimensional bubble swarm rising at high Reynolds number.
[Phys. Rev. Fluids 3, 074307] 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): Andrea Montessori, Marco Lauricella, Sauro Succi, Elad Stolovicki, and David Weitz
Three-dimensional Lattice Boltzmann simulations contrast backflow from an external reservoir into a confined microchannel in a dripping mode where the drop breaks off towards the end of the microchannel with a jetting mode at higher flows with drop break off further downstream inside the reservoir.
[Phys. Rev. Fluids 3, 072202(R)] Published Mon Jul 30, 2018
Author(s): M. A. Bruning, M. Costalonga, S. Karpitschka, and J. H. Snoeijer
The coalescence of surfactant solutions on a substrate is studied. By varying both the contact angle of the droplets and their difference in surface tension, various regimes with distinct timescales of noncoalescence are identified.
[Phys. Rev. Fluids 3, 073605] Published Mon Jul 30, 2018
Author(s): S. Lyu and S. M. Taghavi
There is considerable research to improve the displacement efficiency in buoyant two-fluid flow systems, e.g., when a heavy fluid is injected to displace a light one from a pipe. Experiments show that a pipe rotation helps to completely remove the displaced fluid.
[Phys. Rev. Fluids 3, 074003] Published Mon Jul 30, 2018
Author(s): Benjamin Allen and Arshad Kudrolli
Internal imaging shows that a granular bed consolidates and creeps under the action of fluid flow well below the bedload transport critical rate. The bed is shown to be armored with a systematic increase in erosion threshold depending on the duration and strength of applied subcritical shear.
[Phys. Rev. Fluids 3, 074305] Published Mon Jul 30, 2018
Self-similarity and coarsening rate of a convecting bicontinuous phase separating mixture: Effect of the viscosity contrast
Author(s): Hervé Henry and György Tegze
A computational study shows that the viscosity contrast between the two phases of a multiphase fluid induces noticeable morphological changes to the geometry of the two phases during self-similar coarsening. Quantitative measures are specified.
[Phys. Rev. Fluids 3, 074306] Published Mon Jul 30, 2018
Author(s): Jean-Philippe Boucher, Romain Labbé, Christophe Clanet, and Michael Benzaquen
We present a minimal approach to address the problem of ship hull optimization, and compare our theoretical results with existing data. We show that optimal hull aspect ratios result from a subtle balance between wave drag, pressure drag, and skin friction.
[Phys. Rev. Fluids 3, 074802] 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): M. A. Gallis, J. R. Torczynski, N. P. Bitter, T. P. Koehler, S. J. Plimpton, and G. Papadakis
Simulations of a gas in a Minimal Couette unit at Re=500 using Direct Simulation Monte Carlo, a molecular method enforcing molecular chaos for gas-molecule collisions, reproduces the turbulence from DNS. Thus molecular chaos does not prevent development of long-range correlations in turbulence.
[Phys. Rev. Fluids 3, 071402(R)] Published Thu Jul 26, 2018
Author(s): Thomasina V. Ball and Jerome A. Neufeld
Transient spreading of a viscous fluid beneath an adhered elastic sheet is controlled by the tip dynamics. Spreading occurs in two dynamical regimes: viscosity dominant and adhesion dominant. Experiments with elastic sheets made of PDMS confirm these regimes and the emergence of a vapor tip.
[Phys. Rev. Fluids 3, 074101] Published Thu Jul 26, 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
Oscillatory solutothermal convection-driven evaporation kinetics in colloidal nanoparticle-surfactant complex fluid pendant droplets
Author(s): A. R. Harikrishnan, Purbarun Dhar, Sateesh Gedupudi, and Sarit K. Das
Evaporation kinetics of surfactant-infused nanocolloidal droplets are studied using the pendant mode to understand the pure physics of evaporation in such complex fluids. Oscillatory solute-thermal convective currents are found to be responsible for evaporation rate enhancement in these complex fluids.
[Phys. Rev. Fluids 3, 073604] Published Wed Jul 25, 2018
Author(s): Hadi Pouransari and Ali Mani
We analyze heat transfer between disperse and carrier phases in multiphase turbulent flows. We reduce the full characterization of the problem to two parameters: Stokes number based on large eddy time, and a dimensionless number indicating the ratio of gas thermal relaxation time to large eddy time.
[Phys. Rev. Fluids 3, 074304] 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): Jacob Page and Rich R. Kerswell
A full Koopman decomposition for the velocity field in the Burgers equation is presented by deriving explicit expressions for the Koopman modes and eigenfunctions.
[Phys. Rev. Fluids 3, 071901(R)] Published Tue Jul 24, 2018
Author(s): W. Mostert, D. I. Pullin, R. Samtaney, and V. Wheatley
Geometrical shock dynamics is used to predict that a converging cylindrical shock forms a singularity on the shock profile through nonlinear effects.
[Phys. Rev. Fluids 3, 071401(R)] Published Mon Jul 23, 2018