Latest papers in fluid mechanics

Quasistatic fluid-fluid displacement in porous media: Invasion-percolation through a wetting transition

Physical Review Fluids - Thu, 10/11/2018 - 11:00

Author(s): Bauyrzhan K. Primkulov, Stephen Talman, Keivan Khaleghi, Alireza Rangriz Shokri, Rick Chalaturnyk, Benzhong Zhao, Christopher W. MacMinn, and Ruben Juanes

We introduce an invasion-percolation model which reproduces quasistatic fluid-fluid displacement patterns in porous media under different wettability conditions. Depending on wettability, the fluid front advances through capillary invasion, cooperative filling, or corner flow.


[Phys. Rev. Fluids 3, 104001] Published Thu Oct 11, 2018

Parameter estimation for complex thermal-fluid flows using approximate Bayesian computation

Physical Review Fluids - Thu, 10/11/2018 - 11:00

Author(s): Jason D. Christopher, Nicholas T. Wimer, Caelan Lapointe, Torrey R. S. Hayden, Ian Grooms, Gregory B. Rieker, and Peter E. Hamlington

Approximate Bayesian Computation (ABC) is used to estimate unknown physical parameters in complex thermal-fluid flows.


[Phys. Rev. Fluids 3, 104602] Published Thu Oct 11, 2018

Permanence of large eddies in Richtmyer-Meshkov turbulence with a small Atwood number

Physical Review Fluids - Thu, 10/11/2018 - 11:00

Author(s): Olivier Soulard, Florian Guillois, Jérôme Griffond, Vladimir Sabelnikov, and Serge Simoëns

The existence of large scale invariants in a Richtmyer-Meshkov turbulent mixing zone with a small Atwood number is studied. The impact of these invariants on the self-similarity of the flow, on its anisotropy and mixing levels, is then discussed.


[Phys. Rev. Fluids 3, 104603] Published Thu Oct 11, 2018

Inferring flow parameters and turbulent configuration with physics-informed data assimilation and spectral nudging

Physical Review Fluids - Thu, 10/11/2018 - 11:00

Author(s): Patricio Clark Di Leoni, Andrea Mazzino, and Luca Biferale

A data assimilation technique called nudging is used to control the evolution of turbulence simulations. By studying the response of each simulation to the nudging, information on physical flow parameters is inferred from the data being assimilated.


[Phys. Rev. Fluids 3, 104604] Published Thu Oct 11, 2018

Three-dimensional steady and oscillatory flow in a double bifurcation airway model

Physical Review Fluids - Wed, 10/10/2018 - 11:00

Author(s): Sahar Jalal, Tristan Van de Moortele, Andras Nemes, Omid Amili, and Filippo Coletti

Using Magnetic Resonance Velocimetry, we investigate the steady expiratory and the oscillatory flow in a planar double bifurcation model with geometric proportions relevant to the respiratory human airways for a range of Reynolds (Re) and Womersley (Wo) numbers.


[Phys. Rev. Fluids 3, 103101] Published Wed Oct 10, 2018

Reynolds-number power-law scaling of differential molecular diffusion in turbulent nonpremixed combustion

Physical Review Fluids - Wed, 10/10/2018 - 11:00

Author(s): Chao Han and Haifeng Wang

A statistical analysis is conducted to provide support to a theoretical power-law scaling of the effect of differential molecular diffusion with respect to the Reynolds number in turbulent non-premixed combustion by using previously published direct number simulation data.


[Phys. Rev. Fluids 3, 103201] Published Wed Oct 10, 2018

Thermally modulated cross-stream migration of a surfactant-laden deformable drop in a Poiseuille flow

Physical Review Fluids - Wed, 10/10/2018 - 11:00

Author(s): Sayan Das and Suman Chakraborty

Shape deformation of a surfactant-laden droplet interacts uniquely with a given thermal field to alter its migration in the cross stream direction in response to an applied pressure gradient.


[Phys. Rev. Fluids 3, 103602] Published Wed Oct 10, 2018

Air-propelled, herringbone-textured platelets

Physical Review Fluids - Tue, 10/09/2018 - 11:00

Author(s): Hélène de Maleprade, Dan Soto, David Quéré, E. John Hinch, Tobias Baier, Maximilian T. Schür, and Steffen Hardt

A plate floating on a cushion of air blown through a porous substrate is set in motion when herringbone-shaped grooves redirect the airflow in a preferred direction, allowing contactless manipulation of objects.


[Phys. Rev. Fluids 3, 104101] Published Tue Oct 09, 2018

Influence of wettability on phase connectivity and electrical resistivity

Physical Review E - Mon, 10/08/2018 - 11:00

Author(s): Zhishang Liu, James E. McClure, and Ryan T. Armstrong

Experimental results have shown that resistivity index can deviate from Archie's law at low conductive phase saturation. Previous works have claimed that wettability and flow history are the two main factors causing this phenomenon. Herein, we investigate how the underlying fluid morphology influenc...


[Phys. Rev. E 98, 043102] Published Mon Oct 08, 2018

Superfluid helium-4 hydrodynamics with discrete topological defects

Physical Review Fluids - Mon, 10/08/2018 - 11:00

Author(s): Demosthenes Kivotides

A model of normal-fluid dynamics and its coupling with superfluid vortices is formulated. The role of axial flow instabilities of superfluid vortices in energy transfer from normal-fluid to superfluid turbulence is indicated.


[Phys. Rev. Fluids 3, 104701] Published Mon Oct 08, 2018

Spontaneous capillary propulsion of liquid droplets on substrates with nonuniform curvature

Physical Review Fluids - Fri, 10/05/2018 - 11:00

Author(s): P. Galatola

A liquid droplet spread on a solid substrate with nonuniform curvature, such as a conical surface, spontaneously moves. By assuming that the only source of dissipation is the contact line viscosity, we perturbatively determine the speed of the droplet and the total capillary force acting on it.


[Phys. Rev. Fluids 3, 103601] Published Fri Oct 05, 2018

Self-assembly of a drop pattern from a two-dimensional grid of nanometric metallic filaments

Physical Review E - Thu, 10/04/2018 - 11:00

Author(s): Ingrith Cuellar, Pablo D. Ravazzoli, Javier A. Diez, Alejandro G. González, Nicholas A. Roberts, Jason D. Fowlkes, Philip D. Rack, and Lou Kondic

We report experiments, modeling, and numerical simulations of the self–assembly of particle patterns obtained from a nanometric metallic square grid. Initially, nickel filaments of rectangular cross section are patterned on a SiO2 flat surface, and then they are melted by laser irradiation with ∼18-...


[Phys. Rev. E 98, 043101] Published Thu Oct 04, 2018

Inertial forces for particle manipulation near oscillating interfaces

Physical Review Fluids - Thu, 10/04/2018 - 11:00

Author(s): Siddhansh Agarwal, Bhargav Rallabandi, and Sascha Hilgenfeldt

Oscillating microscale interfaces give rise not only to steady flows, but also steady inertial forces on particles. Our efficient theoretical description of these forces, which can be attractive or repulsive, provides a toolbox for separating and sorting microscale objects like biological cells.


[Phys. Rev. Fluids 3, 104201] Published Thu Oct 04, 2018

Large-scale structure of velocity and passive scalar fields in freely decaying homogeneous anisotropic turbulence

Physical Review Fluids - Thu, 10/04/2018 - 11:00

Author(s): Katsunori Yoshimatsu and Yukio Kaneda

It is shown that there are an infinite number of invariants characterizing the large-scale structure in certain kinds of freely-decaying homogeneous turbulent velocity and passive scalar fields. A self-similarity assumption suggests that the large-scale anisotropy of the fields is persistent.


[Phys. Rev. Fluids 3, 104601] Published Thu Oct 04, 2018

Numerical investigation of breaking internal solitary waves

Physical Review Fluids - Thu, 10/04/2018 - 11:00

Author(s): Giovanni la Forgia, Talia Tokyay, Claudia Adduce, and George Constantinescu

With high-resolution 3D large Eddy Simulations we study internal solitary waves differently breaking over a sloping boundary. The entrainment parameter and mixing efficiency pry apart two effects of turbulent instabilities occurring in stratified fluid in terms of changes in bulk density profile.


[Phys. Rev. Fluids 3, 104801] Published Thu Oct 04, 2018

Generalization of Taylor's formula to particles of arbitrary inertia

Physical Review Fluids - Tue, 10/02/2018 - 11:00

Author(s): S. Boi, A. Mazzino, P. Muratore-Ginanneschi, and S. Olivieri

In the early 1920s Sir G. I. Taylor derived a formula that can be fairly considered one of the cornerstones of large-scale tracer transport. Here, we extend Taylor’s formula to particles of any inertia including Basset and Faxèn corrections, plus other forces in the particle dynamics.


[Phys. Rev. Fluids 3, 104501] Published Tue Oct 02, 2018

Growth of clogs in parallel microchannels

Physical Review Fluids - Mon, 10/01/2018 - 11:00

Author(s): Alban Sauret, Katarzyna Somszor, Emmanuel Villermaux, and Emilie Dressaire

When suspensions flow in microchannels or porous media, particles can get trapped and form clogs. A new model predicts the clogging dynamics and flow rate in simple porous media. The results are relevant to describe the aging of water filters and the influence of proppants on flow through rocks.


[Phys. Rev. Fluids 3, 104301] Published Mon Oct 01, 2018

Transition to turbulence scaling in Rayleigh-Bénard convection

Physical Review E - Fri, 09/28/2018 - 11:00

Author(s): Jörg Schumacher, Ambrish Pandey, Victor Yakhot, and Katepalli R. Sreenivasan

If a fluid flow is driven by a weak Gaussian random force, the nonlinearity in the Navier-Stokes equations is negligibly small and the resulting velocity field obeys Gaussian statistics. Nonlinear effects become important as the driving becomes stronger and a transition occurs to turbulence with ano...


[Phys. Rev. E 98, 033120] Published Fri Sep 28, 2018

Nonlinear thermal effects in unsteady shear flows of a rarefied gas

Physical Review E - Fri, 09/28/2018 - 11:00

Author(s): Y. Ben-Ami and A. Manela

We study the response of a rarefied gas in a slab to the motion of its boundaries in the tangential direction. Different from previous investigations, we consider boundaries displacements at nonsmall Mach (Ma) numbers, coupling the dynamic and thermodynamic gas states, and deviating the system from ...


[Phys. Rev. E 98, 033121] Published Fri Sep 28, 2018

Reynolds number effects in pipe flow turbulence of generalized Newtonian fluids

Physical Review Fluids - Fri, 09/28/2018 - 11:00

Author(s): J. Singh, M. Rudman, and H. M. Blackburn

Direct numerical simulations of turbulent pipe flow of power-law fluids show that the effect of shear thinning on turbulence statistics in the inner-wall region does not disappear as Re is increased. A log-law mean viscosity profile is also predicted that is self-similar in the inner region.


[Phys. Rev. Fluids 3, 094607] Published Fri Sep 28, 2018

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