New Papers in Fluid Mechanics

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

Acoustic detection of electrostatic suppression of the Leidenfrost state

Physical Review E - Thu, 07/12/2018 - 11:00

Author(s): Arjang Shahriari, Preston S. Wilson, and Vaibhav Bahadur

At high temperatures, a droplet can rest on a cushion of its vapor (the Leidenfrost effect). Application of an electric field across the vapor gap fundamentally eliminates the Leidenfrost state by attracting liquid towards the surface. This study uses acoustic signature tracking to study electrostat...


[Phys. Rev. E 98, 013103] Published Thu Jul 12, 2018

Vorticity fluxes and secondary flow: Relevance for turbulence modeling

Physical Review Fluids - Thu, 07/12/2018 - 11:00

Author(s): A. Vidal, H. M. Nagib, and R. Vinuesa

Direct numercal simulations of fully developed turbulence in a rectangular duct are used to study the fluxes of vorticity.


[Phys. Rev. Fluids 3, 072602(R)] Published Thu Jul 12, 2018

Global stability of flowing red blood cell trains

Physical Review Fluids - Thu, 07/12/2018 - 11:00

Author(s): Spencer H. Bryngelson and Jonathan B. Freund

Flowing trains of red blood cells are stable when tightly confined but can otherwise break down into an irregular flow. A linear stability formulation is developed to analyze this biological phenomena, advancing understanding of its origin and guiding the design of devices that process blood cells.


[Phys. Rev. Fluids 3, 073101] Published Thu Jul 12, 2018

Shear fronts in shear-thickening suspensions

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

Author(s): Endao Han, Matthieu Wyart, Ivo R. Peters, and Heinrich M. Jaeger

Snapshot of a propagating shear front that transforms a dense suspension from a fluid into a jammed, solid-like state. A comprehensive description of this transformation is developed, which links the transient dynamics to parameters obtainable from steady-state rheology.


[Phys. Rev. Fluids 3, 073301] Published Wed Jul 11, 2018

Resolvent analysis of separated and attached flows around an airfoil at transitional Reynolds number

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

Author(s): Nikitas Thomareis and George Papadakis

Cross-stream component of the optimal response at the natural shear layer frequency (solid black line: displacement thickness of the boundary layer, solid brown line: zero-streamwise mean velocity contour).


[Phys. Rev. Fluids 3, 073901] Published Wed Jul 11, 2018

Minimum size for the top jet drop from a bursting bubble

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

Author(s): C. Frederik Brasz, Casey T. Bartlett, Peter L. L. Walls, Elena G. Flynn, Yingxian Estella Yu, and James C. Bird

High-speed imaging experiments and numerical simulations show that the minimum size of drops ejected after bubble bursting is determined by an interplay of viscous and inertial-capillary forces both prior and subsequent to jet formation. Implications for sea spray aerosol generation are discussed.


[Phys. Rev. Fluids 3, 074001] Published Wed Jul 11, 2018

Clogging at pore scale and pressure-induced erosion

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

Author(s): R. Jäger, M. Mendoza, and H. J. Herrmann

Using a coupled lattice Boltzmann method/discrete element method model, the clogging of a pore with particles at microscopic scale is studied. We show that erosive bursts occur when the hydraulic pressure exceeds a critical point, which depends on the adhesive forces and the pores’ geometry.


[Phys. Rev. Fluids 3, 074302] Published Wed Jul 11, 2018

Sinuous distortion of vortex surfaces in the lateral growth of turbulent spots

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

Author(s): Yaomin Zhao, Shiying Xiong, Yue Yang, and Shiyi Chen

There is a continued debate about the generation mechanism of turbulent spots in boundary-layer transition. We use the vortex-surface field to show that the sinuous distortion of vortex surfaces plays an important role in the rapid lateral growth of turbulent spots.


[Phys. Rev. Fluids 3, 074701] Published Wed Jul 11, 2018

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