Physical Review Fluids
Author(s): S. R. Yoffe and W. D. McComb
A numerical simulation of freely decaying turbulence shows that the iconic curve of dimensionless dissipation against Reynolds number depends quite strongly on the choice of time at which the turbulence is assumed to have evolved from the arbitrary initial conditions.
[Phys. Rev. Fluids 3, 104605] Published Mon Oct 15, 2018
Author(s): P. G. Ledda, L. Siconolfi, F. Viola, F. Gallaire, and S. Camarri
The effect of the porosity and permeability on the wakes of porous rectangular cylinders is numerically studied using linear stability analyses. We show that the flow is progressively stabilized when obstacles of increased permeability are considered, up to the suppression of the vortex shedding.
[Phys. Rev. Fluids 3, 103901] Published Fri Oct 12, 2018
Author(s): Sebastian Leitmann, Suvendu Mandal, Matthias Fuchs, Antonio M. Puertas, and Thomas Franosch
An exact analytic solution is derived for the dynamic response of a probe particle in a dilute colloidal suspension exposed to a strong step force.
[Phys. Rev. Fluids 3, 103301] Published Thu Oct 11, 2018
Author(s): Alexander Farutin, Zaiyi Shen, Gael Prado, Vassanti Audemar, Hamid Ez-Zahraouy, Abdelilah Benyoussef, Benoit Polack, Jens Harting, Petia M. Vlahovska, Thomas Podgorski, Gwennou Coupier, and Chaouqi Misbah
The optimization of the transport of suspended deformable particles in channels and networks is studied. The complexity of global optimization at the level of an entire network with channels of different lengths and diameters is highlighted, with a specific focus on blood circulation.
[Phys. Rev. Fluids 3, 103603] Published Thu Oct 11, 2018
Quasistatic fluid-fluid displacement in porous media: Invasion-percolation through a wetting transition
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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