Physical Review Fluids

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Updated: 23 hours 19 min ago

Hydrodynamic loading of perforated disks in creeping flows

Tue, 08/06/2019 - 11:00

Author(s): E. F. Strong, M. Pezzulla, F. Gallaire, P. Reis, and L. Siconolfi

The drag of perforated thin disks is studied at low Reynolds numbers via displacement controlled experiments and simulations. It is shown that the drag of the disks is affected by the size of the voids, but not by the disk thickness. Good agreement is observed with existing analytical solutions.

[Phys. Rev. Fluids 4, 084101] Published Tue Aug 06, 2019

Finite Reynolds number effect and the 4/5 law

Tue, 08/06/2019 - 11:00

Author(s): R. A. Antonia, S. L. Tang, L. Djenidi, and Y. Zhou

A relatively extensive survey of published data shows that the 4/5 law has not yet been observed in either experiments or simulations because the Reynolds number is not sufficiently large.

[Phys. Rev. Fluids 4, 084602] Published Tue Aug 06, 2019

Dynamic detonation stabilization in supersonic expanding channels

Mon, 08/05/2019 - 11:00

Author(s): Xiaodong Cai, Ralf Deiterding, Jianhan Liang, Mingbo Sun, and Dezun Dong

Using adaptive numerical solutions of the reactive Navier-Stokes equations we clarify the mechanism of detonation stabilization in supersonic expanding channels, and further demonstrate that by dynamically controlling a moving boundary dynamically stationary detonation propagation is possible.

[Phys. Rev. Fluids 4, 083201] Published Mon Aug 05, 2019

Instability driven by shear thinning and elasticity in the flow of concentrated polymer solutions through microtubes

Mon, 08/05/2019 - 11:00

Author(s): Bidhan Chandra, Rahul Mangal, Debopam Das, and V. Shankar

Polymers make flow in a tube unstable at low Reynolds numbers. An investigation shows that laminar flows of polymer solutions in a tube become unstable, unlike Newtonian fluids, at a Reynolds number as low as 10. This occurs because of the elastic and shear-thinning nature of polymer solutions.

[Phys. Rev. Fluids 4, 083301] Published Mon Aug 05, 2019

Stability of plane Poiseuille flow of a Bingham fluid through a deformable neo-Hookean channel

Mon, 08/05/2019 - 11:00

Author(s): Ramkarn Patne and V. Shankar

Flow of Bingham fluids is unstable if channel walls are deformable. Laminar flows of Bingham fluids in rigid-walled channels are stable to tiny disturbances. A study finds that if the walls are made deformable, the flow becomes unstable at very low Reynolds number.

[Phys. Rev. Fluids 4, 083302] Published Mon Aug 05, 2019

Surface tension and the origin of the circular hydraulic jump in a thin liquid film

Fri, 08/02/2019 - 11:00

Author(s): Alexis Duchesne, Anders Andersen, and Tomas Bohr

We discuss how to include surface tension in viscous thin film flows such as the circular hydraulic jump. We show that an energy term previously proposed can lead to a large overestimate of the influence of surface tension.

[Phys. Rev. Fluids 4, 084001] Published Fri Aug 02, 2019

Conservation of the circulation for the Euler and Euler-Leray equations

Fri, 08/02/2019 - 11:00

Author(s): Jean Ginibre, Martine Le Berre, and Yves Pomeau

A simple proof of the Kelvin Theorem, namely conservation of circulation (CC) for solutions of the Euler equation, is given. The result is rewritten in terms of time rescaled variables leading to the Euler-Leray equations, and the implications of CC on the existence of self-similar solutions are discussed.

[Phys. Rev. Fluids 4, 084401] Published Fri Aug 02, 2019

Flow induced by a rotating cone: Base flow and convective stability analysis

Fri, 08/02/2019 - 11:00

Author(s): Antonio Segalini and Simone Camarri

The boundary layer over a cone rotating in a still fluid is investigated. A self-similar correction to the classical von Kármán solution, taking into account the effect of the outer flow, is proposed and validated. Finally, the stability properties of the corrected base flow are assessed.

[Phys. Rev. Fluids 4, 084801] Published Fri Aug 02, 2019

Spatial characteristics of a zero-pressure-gradient turbulent boundary layer in the presence of free-stream turbulence

Thu, 08/01/2019 - 11:00

Author(s): Eda Dogan, R. Jason Hearst, Ronald E. Hanson, and Bharathram Ganapathisubramani

Particle image velocimetry measurements are performed to examine the spatial structure in boundary layers under the influence of free-stream turbulence (FST). A similarity of the structural organization inside the boundary layer is found between the present FST cases and the canonical flows.

[Phys. Rev. Fluids 4, 084601] Published Thu Aug 01, 2019

Boundary-layer transition over a rotating broad cone

Wed, 07/31/2019 - 11:00

Author(s): K. Kato, P. H. Alfredsson, and R. J. Lingwood

Twenty-four small roughness elements in the boundary layer on a rotating cone trigger stationary vortices, which grow and saturate, followed by a rapid growth of non-stationary modes and a transition to turbulence.

[Phys. Rev. Fluids 4, 071902(R)] Published Wed Jul 31, 2019

Predicting the response of turbulent channel flow to varying-phase opposition control: Resolvent analysis as a tool for flow control design

Wed, 07/31/2019 - 11:00

Author(s): Simon S. Toedtli, Mitul Luhar, and Beverley J. McKeon

Resolvent analysis predicts and direct numerical simulation confirms that the effectiveness of opposition control depends on the phase between sensor and actuator. The results confirm the capability of resolvent analysis as a tool for flow control design and raise interesting flow physics questions.

[Phys. Rev. Fluids 4, 073905] Published Wed Jul 31, 2019

Optimum air turbulence intensity for polydisperse droplet size growth

Wed, 07/31/2019 - 11:00

Author(s): M. Shyam Kumar, S. R. Chakravarthy, and Manikandan Mathur

Droplet size growth is usually enhanced by turbulence in the background air flow. Experimental measurements show the existence of an optimum air turbulent intensity for maximum droplet size growth in a polydisperse droplet field. The onset of clustering is shown to play an important role.

[Phys. Rev. Fluids 4, 074607] Published Wed Jul 31, 2019

Statistics of single and multiple floaters in experiments of surface wave turbulence

Wed, 07/31/2019 - 11:00

Author(s): Nicolás F. Del Grosso, Lucía M. Cappelletti, Nicolás E. Sujovolsky, Pablo D. Mininni, and Pablo J. Cobelli

Laboratory experiments of floaters’ displacements in surface wave turbulence reveal that a combination of waves, eddies, and large-scale circulation team up to cause particle dispersion and preferential concentration. A simple physical model can reproduce all observations.

[Phys. Rev. Fluids 4, 074805] Published Wed Jul 31, 2019

Drag force of polyethyleneglycol in flow measured by a scanning probe microscope

Tue, 07/30/2019 - 11:00

Author(s): Ruri Hidema, Seika Hayashi, and Hiroshi Suzuki

Drag force due to polyethyleneglycol in a flow was measured by using a scanning probe microscope. The conformation of the polymer in the flow was predicted to have a stem and ellipsoidal-flower shape. The drag force due to the deformed polymers predicted by this model was calculated and confirmed.

[Phys. Rev. Fluids 4, 074201] Published Tue Jul 30, 2019

Experimental estimation of turbulence modification by inertial particles at moderate ${\mathrm{Re}}_{λ}$

Mon, 07/29/2019 - 11:00

Author(s): D. O. Mora, A. Cartellier, and M. Obligado

We advance a new method to estimate the turbulent kinetic energy of the carrier phase in the presence of sub-Kolmogorov particles εp. Our results suggest that particles affect the carrier phase turbulent cascade in a nontrivial manner at concentrations close to ϕv=10−5, and Reλ∈[200,600].

[Phys. Rev. Fluids 4, 074309] Published Mon Jul 29, 2019

Experimental investigation of the interaction of a weak planar shock with grid turbulence in a counter-driver shock tube

Fri, 07/26/2019 - 11:00

Author(s): Takahiro Tamba, Gaku Fukushima, Masaya Kayumi, Akira Iwakawa, and Akihiro Sasoh

The interaction of a planar shock wave with grid generated turbulence finds that at first the turbulence increases the projection thickness of the shock and then at higher intensities fragments the shock.

[Phys. Rev. Fluids 4, 073401] Published Fri Jul 26, 2019

Basset-Boussinesq history force of a fluid sphere

Fri, 07/26/2019 - 11:00

Author(s): Dominique Legendre, Azeddine Rachih, Claire Souilliez, Sophie Charton, and Eric Climent

Direct numerical simulations are used to characterize the equivalent slip length at a spherical drop interface under Stokes flow conditions. An analytic form of the memory kernel for the force acting on a viscous drop is proposed and validated.

[Phys. Rev. Fluids 4, 073603] Published Fri Jul 26, 2019

Evolution of wall shear stress with Reynolds number in fully developed turbulent channel flow experiments

Fri, 07/26/2019 - 11:00

Author(s): Pierre-Alain Gubian, Jordan Stoker, James Medvescek, Laurent Mydlarski, and B. Rabi Baliga

An experimental study concludes that beyond Reτ∼600, the wall shear stress (τw) evolves to an asymptotic state in which the statistical moments, probability density function, and power spectra of τw become independent of Reynolds number.

[Phys. Rev. Fluids 4, 074606] Published Fri Jul 26, 2019

Multiscaling analysis of buoyancy-driven turbulence in a differentially heated vertical channel

Thu, 07/25/2019 - 11:00

Author(s): Tie Wei

A three-layer structure is proposed for a differentially heated vertical channel, based on the properties of force balance in the mean momentum equation. A three-layer structure is also proposed for the mean heat equation. A multiscaling analysis is developed for the inner and outer layers.

[Phys. Rev. Fluids 4, 073502] Published Thu Jul 25, 2019

Analysis of the equilibrium wall model for high-speed turbulent flows

Thu, 07/25/2019 - 11:00

Author(s): Prahladh S. Iyer and Mujeeb R. Malik

Available direct numerical simulation databases are used to study the sensitivity of wall model predictions to different eddy viscosity models, damping function scalings, and associated constants. A new “mixedmin2” damping function scaling is proposed, which works better for high-speed flows over a range of conditions.

[Phys. Rev. Fluids 4, 074604] Published Thu Jul 25, 2019