Physical Review Fluids

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Role of hydrodynamic shear layer stability in driving combustion instability in a premixed propane-air backward-facing step combustor

Mon, 06/18/2018 - 11:00

Author(s): Santosh Hemchandra, Santosh Shanbhogue, Seunghyuck Hong, and Ahmed F. Ghoniem

With numerical methods and analysis of existing experimental results we show that combustion instability in a backward-facing step combustor can be maintained either with weak coupling between acoustic and hydrodynamic modes (semi-open loop) or with strong coupling (fully closed loop).

[Phys. Rev. Fluids 3, 063201] Published Mon Jun 18, 2018

Effects of finite spatial and temporal resolution in direct numerical simulations of incompressible isotropic turbulence

Mon, 06/18/2018 - 11:00

Author(s): P. K. Yeung, K. R. Sreenivasan, and S. B. Pope

A study combining spectral filtering and numerical simulations at enhanced spatial and/or temporal resolution is used to clarify the proper scaling of dissipation and enstrophy in forced incompressible isotropic turbulence.

[Phys. Rev. Fluids 3, 064603] Published Mon Jun 18, 2018

Wall slip of complex fluids: Interfacial friction versus slip length

Fri, 06/15/2018 - 11:00

Author(s): Benjamin Cross, Chloé Barraud, Cyril Picard, Liliane Léger, Frédéric Restagno, and Élisabeth Charlaix

Experiments with a complex fluid in an oscillating atomic force microscope find that the wall slip is well characterised by a real Navier interfacial friction coefficient instead of the usual slip height.

[Phys. Rev. Fluids 3, 062001(R)] Published Fri Jun 15, 2018

From hindered to promoted settling in dispersions of attractive colloids: Simulation, modeling, and application to macromolecular characterization

Fri, 06/15/2018 - 11:00

Author(s): Andrew M. Fiore, Gang Wang, and James W. Swan

Immersed boundary simulations are used to study settling in dispersions of sticky colloids and to develop an empirical model for the settling rate that is in good agreement with experiments. The model is applied to characterize attractive interactions in concentrated macromolecular solutions.

[Phys. Rev. Fluids 3, 063302] Published Fri Jun 15, 2018

Theoretical and experimental investigation of forward spatter of blood from a gunshot

Fri, 06/15/2018 - 11:00

Author(s): P. M. Comiskey, A. L. Yarin, and D. Attinger

A theoretical model predicts forward blood spatter from a 9-mm bullet and favorably agrees with experimental data. Blood drop generation is explained through chaotic liquid disintegration built in the framework of percolation theory.

[Phys. Rev. Fluids 3, 063901] Published Fri Jun 15, 2018

Propagating helical waves as a building block of round turbulent jets

Thu, 06/14/2018 - 11:00

Author(s): R. I. Mullyadzhanov, R. D. Sandberg, S. S. Abdurakipov, W. K. George, and K. Hanjalić

In direct numerical simulations of a turbulent jet, propagating helical waves which contain much of the energy are tracked from the near to the far field in order to find their scaling properties and dispersion laws.

[Phys. Rev. Fluids 3, 062601(R)] Published Thu Jun 14, 2018

Announcement: PRFluids Editors' Suggestions

Wed, 06/13/2018 - 11:00

[Phys. Rev. Fluids 3, 060001] Published Wed Jun 13, 2018

Granular collapse in a fluid: Different flow regimes for an initially dense-packing

Wed, 06/13/2018 - 11:00

Author(s): Alexis Bougouin and Laurent Lacaze

The collapse of a granular column in a fluid shows that both the dynamics and the deposit shape depend on the aspect ratio, Stokes number, and grain-fluid density ratio. Classification of flow regimes and characterization of the associated dynamics are proposed through an experimental investigation.

[Phys. Rev. Fluids 3, 064305] Published Wed Jun 13, 2018

Numerical simulation of cavitation and atomization using a fully compressible three-phase model

Tue, 06/12/2018 - 11:00

Author(s): Murali-Girija Mithun, Phoevos Koukouvinis, and Manolis Gavaises

A fully compressible three-phase cavitation model is developed to study the interaction between the cavitation and primary atomization. The simulations reveal that the developing cavitation condition with cyclic air entrainment is the most favourable condition for primary atomization.

[Phys. Rev. Fluids 3, 064304] Published Tue Jun 12, 2018

Three-dimensionality of one- and two-layer electromagnetically driven thin-layer flows

Tue, 06/12/2018 - 11:00

Author(s): Jeffrey Tithof, Benjamin C. Martell, and Douglas H. Kelley

Two-dimensional flow is often approximated by driving thin fluid layers electromagnetically. By comparing three common experimental configurations, it is shown that the single-layer and immiscible configurations minimize out-of-plane flow over a wider range of Reynolds numbers than miscible configurations.

[Phys. Rev. Fluids 3, 064602] Published Tue Jun 12, 2018

Viscoelastic fluid-structure interactions between a flexible cylinder and wormlike micelle solution

Mon, 06/11/2018 - 11:00

Author(s): Anita A. Dey, Yahya Modarres-Sadeghi, and Jonathan P. Rothstein

Elastic flow instabilities in the wake of a flexible cylinder can drive the motion of the cylinder, resulting in 1D and 2D oscillations. The time variation of the flow field and the state of stress in the fluid are shown using particle image tracking and flow-induced birefringence images.

[Phys. Rev. Fluids 3, 063301] Published Mon Jun 11, 2018

Rheology of dense granular flows in two dimensions: Comparison of fully two-dimensional flows to unidirectional shear flow

Fri, 06/08/2018 - 11:00

Author(s): Ashish Bhateja and Devang V. Khakhar

Numerical simulations of dense granular flows in three different planar geometries find that the μ-I scaling for the local viscosity is found to be valid for each geometry, but the data for the three geometries do not collapse to a single curve.

[Phys. Rev. Fluids 3, 062301(R)] Published Fri Jun 08, 2018

Hydrodynamic bifurcation in electro-osmotically driven periodic flows

Fri, 06/08/2018 - 11:00

Author(s): Alexander Morozov, Davide Marenduzzo, and Ronald G. Larson

In this paper, we report an inertial instability that occurs in electro-osmotically driven channel flows. We assume that the charge motion under the influence of an externally applied electric field is confined to a small vicinity of the channel walls that, effectively, drives a bulk flow through a ...

[Phys. Rev. Fluids 3, 063702] Published Fri Jun 08, 2018

Influence of a thin compressible insoluble liquid film on the eddy currents generated by interacting surface waves

Fri, 06/08/2018 - 11:00

Author(s): Vladimir M. Parfenyev and Sergey S. Vergeles

Crossed surface waves generate eddy currents near the fluid surface owing to hydrodynamic nonlinearity. We studied how these currents penetrate into the fluid bulk and showed that a thin compressible insoluble liquid film presented on the fluid surface increases their intensity.

[Phys. Rev. Fluids 3, 064702] Published Fri Jun 08, 2018

Observation of the pressure effect in simulations of droplets splashing on a dry surface

Thu, 06/07/2018 - 11:00

Author(s): A. M. P. Boelens, A. Latka, and J. J. de Pablo

At atmospheric pressure, a droplet impacting on a surface produces a splash. Reducing the ambient pressure suppresses this splash. The pressure effect is not well understood and this is the first study to present an in-depth comparison between various theoretical splashing models and simulations.

[Phys. Rev. Fluids 3, 063602] Published Thu Jun 07, 2018

Electrohydrodynamic ionic wind, force field, and ionic mobility in a positive dc wire-to-cylinders corona discharge in air

Thu, 06/07/2018 - 11:00

Author(s): Nicolas Monrolin, Olivier Praud, and Franck Plouraboué

Particle image velocimetry of ionic wind produced by a positive dc corona in air is used to evaluate lift force, and results are consistent with a general theoretical expression previously found for net momentum transfer. Momentum transfer efficiency is found to be sensitive to the electrode aerodynamic wake and the electric field orientation.

[Phys. Rev. Fluids 3, 063701] Published Thu Jun 07, 2018

Numerical investigation of homogeneous cavitation nucleation in a microchannel

Thu, 06/07/2018 - 11:00

Author(s): Xiuxiu Lyu, Shucheng Pan, Xiangyu Hu, and Nikolaus A. Adams

With the Euler-Lagrangian coupled method we simulate homogeneous nucleation cavitation induced by shock reflection in a microchannel. Nucleation is found to occur in three stages: energy deposition, generation, and growth. Initial generation time is not found to depend strongly on shock intensity.

[Phys. Rev. Fluids 3, 064303] Published Thu Jun 07, 2018

Electrochemical wall shear rate microscopy of collapsing bubbles

Wed, 06/06/2018 - 11:00

Author(s): Fabian Reuter and Robert Mettin

A high-speed method for time-resolved measurements of wall shear rates providing microscopic resolution is presented. The wall shear rates produced by a single, collapsing cavitation bubble are studied.

[Phys. Rev. Fluids 3, 063601] Published Wed Jun 06, 2018

Examination of propeller sound production using large eddy simulation

Wed, 06/06/2018 - 11:00

Author(s): Jacob Keller, Praveen Kumar, and Krishnan Mahesh

Results of a high-fidelity large eddy simulation are used to compute the far-field sound that results from the unsteady loading of a propeller operating at design condition. High levels of unsteadiness at the blade tip account for the majority of far-field sound.

[Phys. Rev. Fluids 3, 064601] Published Wed Jun 06, 2018

Onset of chaos in helical vortex breakdown at low Reynolds number

Wed, 06/06/2018 - 11:00

Author(s): S. Pasche, F. Avellan, and F. Gallaire

The dynamics of the helical vortex breakdown has revealed a Ruelle-Takens-Newhouse route to chaos coming from the nonlinear interactions of pure hydrodynamic modes. Global stability analysis, Fourier series decomposition, and time series analysis have been used to shed light on the dynamical states.

[Phys. Rev. Fluids 3, 064701] Published Wed Jun 06, 2018