Latest papers in fluid mechanics

Revised model for the radiation force exerted by standing surface acoustic waves on a rigid cylinder

Physical Review E - Fri, 03/09/2018 - 10:00

Author(s): Shen Liang and Wang Chaohui

In this paper, a model for the radiation force exerted by standing surface acoustic waves (SSAWs) on a rigid cylinder in inviscid fluids is extended to account for the dependence on the Rayleigh angle. The conventional model for the radiation force used in the SSAW-based applications is developed in...

[Phys. Rev. E 97, 033103] Published Fri Mar 09, 2018

Modeling the effects of small turbulent scales on the drag force for particles below and above the Kolmogorov scale

Physical Review Fluids - Fri, 03/09/2018 - 10:00

Author(s): Mikhael Gorokhovski and Rémi Zamansky

A stochastic model is proposed for the response of heavy particles to the small scales of high Reynolds number turbulent flow. Particles below and above the Kolmogorov scale are both considered. In the context of large eddy simulations, this model is assessed by comparison with statistics from direct numerical simulations and experiments.

[Phys. Rev. Fluids 3, 034602] Published Fri Mar 09, 2018

Wake of inertial waves of a horizontal cylinder in horizontal translation

Physical Review Fluids - Fri, 03/09/2018 - 10:00

Author(s): Nathanaël Machicoane, Vincent Labarre, Bruno Voisin, Frédéric Moisy, and Pierre-Philippe Cortet

The inertial wave wake of a horizontal cylinder translated horizontally in a fluid rotating about the vertical is analyzed. Results show that, owing to horizontal invariance, the slender-body approximation leads to a quantitative theoretical model of the experimental wake, even for a nonslender body.

[Phys. Rev. Fluids 3, 034801] Published Fri Mar 09, 2018

Universal stability curve for pattern formation in pulsed gas-solid fluidized beds of sandlike particles

Physical Review Fluids - Thu, 03/08/2018 - 10:00

Author(s): Lilian de Martín, Coen Ottevanger, J. Ruud van Ommen, and Marc-Olivier Coppens

Granular matter can form regular patterns under periodic excitations, such as ripples on a sandy beach. Pattern formation can also be used to structure the dynamics of a fluidized bed. New experiments show that the pattern stability curve is governed by universal scaling, underpinned by fluid-dynamical fundamentals.

[Phys. Rev. Fluids 3, 034303] Published Thu Mar 08, 2018

Time-dependent particle migration and margination in the pressure-driven channel flow of blood

Physical Review Fluids - Wed, 03/07/2018 - 10:00

Author(s): Qin M. Qi and Eric S. G. Shaqfeh

The time evolution of the red blood cell and platelet concentration distributions in pressure-driven flow through a straight channel is studied using a coarse-grained theory with comparison to boundary integral simulations. Key time scales and entrance lengths to reach steady state are reported.

[Phys. Rev. Fluids 3, 034302] Published Wed Mar 07, 2018

Three-dimensional simulations of void collapse in energetic materials

Physical Review Fluids - Tue, 03/06/2018 - 10:00

Author(s): Nirmal Kumar Rai and H. S. Udaykumar

We study the dynamics of void collapse and hot spot formation with 3D reactive void collapse simulations for various void shapes. We find that dimensionality plays an important role in hot-spot dynamics, underlining the importance of 3D simulations.

[Phys. Rev. Fluids 3, 033201] Published Tue Mar 06, 2018

Competition between drag and Coulomb interactions in turbulent particle-laden flows using a coupled-fluid–Ewald-summation based approach

Physical Review Fluids - Tue, 03/06/2018 - 10:00

Author(s): Yuan Yao and Jesse Capecelatro

A new method is presented for capturing charged inertial particles in turbulence. Numerical simulations show that even in dilute suspensions, particles can self-induce an electric field because of preferential concentration by the particles, resulting in particle agglomeration and enhanced clustering.

[Phys. Rev. Fluids 3, 034301] Published Tue Mar 06, 2018

Contribution of large scale coherence to wind turbine power: A large eddy simulation study in periodic wind farms

Physical Review Fluids - Mon, 03/05/2018 - 10:00

Author(s): Tanmoy Chatterjee and Yulia T. Peet

We study massive wind farms with large eddy simultations to improve understanding of wind turbine interaction with atmospheric turbulence. Large scale structures are found to be linked to downdraft mechanisms contributing to turbine power and to modulation of near wall eddies.

[Phys. Rev. Fluids 3, 034601] Published Mon Mar 05, 2018

Heavy inertial particles in turbulent flows gain energy slowly but lose it rapidly

Physical Review E - Fri, 03/02/2018 - 10:00

Author(s): Akshay Bhatnagar, Anupam Gupta, Dhrubaditya Mitra, and Rahul Pandit

We present an extensive numerical study of the time irreversibility of the dynamics of heavy inertial particles in three-dimensional, statistically homogeneous, and isotropic turbulent flows. We show that the probability density function (PDF) of the increment, W(τ), of a particle's energy over a ti...

[Phys. Rev. E 97, 033102] Published Fri Mar 02, 2018


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