New Papers in Fluid Mechanics

PIV of Swirling Flow in a Conical Pipe with Vibrating Wall

Sheffield - Thu, 07/19/2018 - 02:53
Author(s):Xu, Y. | Zhang, Y.-Y. | Nicolleau, F.C.G.A. | Wang, Z.-C.
Publication year: 2018
Journal / Book title: International Journal of Applied Mechanics

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Edge states control droplet breakup in subcritical extensional flows

Physical Review Fluids - Wed, 07/18/2018 - 11:00

Author(s): Giacomo Gallino, Tobias M. Schneider, and François Gallaire

We examine theoretically the break-up dynamics of a droplet in a sub-critical extensional flow. We find that it is analogous to other nonlinear dynamical systems with a finite basin of attraction, being governed by an unstable edge state equilibrium in the basin boundary of the base state.


[Phys. Rev. Fluids 3, 073603] Published Wed Jul 18, 2018

Drag coefficient and flow structure downstream of mangrove root-type models through PIV and direct force measurements

Physical Review Fluids - Wed, 07/18/2018 - 11:00

Author(s): Amirkhosro Kazemi, Keith Van de Riet, and Oscar M. Curet

The drag coefficient of mangrove roots reveals a dependency on porosity and Reynolds number. By introducing the effective diameter via streamwise velocity and vortex shedding frequency, the effective drag coefficient of the root model can be predicted from a universal curve fit.


[Phys. Rev. Fluids 3, 073801] Published Wed Jul 18, 2018

Control of Rayleigh-Taylor instability onset time and convective velocity by differential diffusion effects

Physical Review E - Tue, 07/17/2018 - 11:00

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

Influence of capillarity and gravity on confined Faraday waves

Physical Review Fluids - Tue, 07/17/2018 - 11:00

Author(s): S. V. Diwakar, Vibhor Jajoo, Sakir Amiroudine, Satoshi Matsumoto, Ranga Narayanan, and Farzam Zoueshtiagh

The dual roles of gravity and interfacial tension are experimentally studied. The existence of a crossover frequency, on either side of which gravity plays opposing roles, is confirmed. Faraday waves show a surprising stabilization with the reduction in interfacial tension.


[Phys. Rev. Fluids 3, 073902] Published Tue Jul 17, 2018

Microscopic investigation of vortex breakdown in a dividing T-junction flow

Physical Review Fluids - Mon, 07/16/2018 - 11:00

Author(s): San To Chan, Simon J. Haward, and Amy Q. Shen

A clear visualization of vortex breakdown is captured in a dividing microfluidic T-junction flow. This eye-catching structure can be greatly altered by slight outflow imbalances. Our results will guide the use of vortex breakdown to enhance flow control in lab-on-a-chip devices.


[Phys. Rev. Fluids 3, 072201(R)] Published Mon Jul 16, 2018

Optimized kinematics enable both aerial and aquatic propulsion from a single three-dimensional flapping wing

Physical Review Fluids - Mon, 07/16/2018 - 11:00

Author(s): Jacob S. Izraelevitz, Miranda Kotidis, and Michael S. Triantafyllou

Experiments on a prototype flapping robotic wing show that a single design can propel in both air and water, as do puffins and other auks, by varying wing kinematics. We optimize for each fluid with a force measurement feedback scheme and determine the unsteady wakes through dye visualization.


[Phys. Rev. Fluids 3, 073102] Published Mon Jul 16, 2018

Cole-Hopf-Feynman-Kac formula and quasi-invariance for Navier-Stokes equations

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Ohkitani, K.
Publication year: 2017
Journal / Book title: Journal of Physics A: Mathematical and Theoretical

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Using modal decompositions to explain the sudden expansion of the mixing layer in the wake of a groyne in a shallow flow

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Higham, J.E. | Brevis, W. | Keylock, C.J. | Safarzadeh, A.
Publication year: 2017
Journal / Book title: Advances in Water Resources

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Analogue of the Cole-Hopf transform for the incompressible Navier–Stokes equations and its application

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Ohkitani, K.
Publication year: 2017
Journal / Book title: Journal of Turbulence

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Multifractal surrogate-data generation algorithm that preserves pointwise Hölder regularity structure, with initial applications to turbulence

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Keylock, C.J.
Publication year: 2017
Journal / Book title: Physical Review E

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Near-invariance under dynamic scaling for Navier-Stokes equations in critical spaces: A probabilistic approach to regularity problems

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Ohkitani, K.
Publication year: 2017
Journal / Book title: Journal of Physics A: Mathematical and Theoretical

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Fractional random walk lattice dynamics

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Michelitsch, T.M. | Collet, B.A. | Riascos, A.P. | Nowakowski, A.F. | Nicolleau, F.C.G.A.
Publication year: 2017
Journal / Book title: Journal of Physics A: Mathematical and Theoretical

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A fractional generalization of the classical lattice dynamics approach

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Michelitsch, T.M. | Collet, B.A. | Riascos, A.P. | Nowakowski, A.F. | Nicolleau, F.C.G.A.
Publication year: 2016
Journal / Book title: Chaos, Solitons and Fractals

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A rapid non-iterative proper orthogonal decomposition based outlier detection and correction for PIV data

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Higham, J.E. | Brevis, W. | Keylock, C.J.
Publication year: 2016
Journal / Book title: Measurement Science and Technology

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Large eddy simulation of the velocity-intermittency structure for flow over a field of symmetric dunes

Sheffield - Mon, 07/16/2018 - 02:20
Author(s):Keylock, C.J. | Chang, K.S. | Constantinescu, G.S.
Publication year: 2016
Journal / Book title: Journal of Fluid Mechanics

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Pore-scale statistics of flow and transport through porous media

Physical Review E - Fri, 07/13/2018 - 11:00

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

Growth of liquid-gas interfacial perturbations driven by acoustic waves

Physical Review Fluids - Fri, 07/13/2018 - 11:00

Author(s): Brandon Patterson and Eric Johnsen

Motivated by ultrasound-induced pulmonary hemorrhage, we computationally study acoustic waves in water interacting with a perturbed water-air interface. We demonstrate that baroclinic vorticity due to the misaligned pressure (waves) and density (interface) gradients drives the perturbation growth.


[Phys. Rev. Fluids 3, 074002] Published Fri Jul 13, 2018

Segregation of large particles in dense granular flows suggests a granular Saffman effect

Physical Review Fluids - Fri, 07/13/2018 - 11:00

Author(s): K. van der Vaart, M. P. van Schrojenstein Lantman, T. Weinhart, S. Luding, C. Ancey, and A. R. Thornton

What causes the rising or segregation of large particles at very low concentrations in dense bidisperse granular flows? The scaling of the lift force experienced by large particles with their downstream velocity lag suggests that the answer is a granular equivalent of the Saffman effect.


[Phys. Rev. Fluids 3, 074303] Published Fri Jul 13, 2018

Coherent structures in a screen cylinder wake

Physical Review Fluids - Fri, 07/13/2018 - 11:00

Author(s): Azlin Mohd Azmi, Tongming Zhou, Yu Zhou, Hanfeng Wang, and Liang Cheng

While the solid cylinder wake shows apparent and stable shedding frequency, the screen cylinder wake shows a broad-band peak with a trend of decreasing frequency, indicating that amalgamation of vortices has taken place. This trend implies that the merging process does not occur at a fixed location.


[Phys. Rev. Fluids 3, 074702] Published Fri Jul 13, 2018

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