Physics of Fluids

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Flow and Plants

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POP/POF CFP

📢 Call For Papers This Special Joint Topic for Physics of Fluids and Physics of Plasmas is open for submissions! Submit by December 31, 2023. Learn more about POF here: https://aippub.org/3DHWL9H Learn more about POP here: https://aippub.org/3DJji6c

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Hydrogen Flame and Detonation Physics

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Advanced Rheology of Complex Fluids for Next-Generation Technologies

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Advanced Rheology of Complex Fluids for Next-Generation Technologies

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Special Topic: One Hundred Years of Giesekus

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Two new types of vortex-loop structures have recently been identified and presented in the article “Antisymmetric vortex interactions in the wake behind a step cylinder” from the Norwegian University of Science and Technology (NTNU). The real- and fake-loop structures, which are topologically different, can be seen in the animation with blue and red colors, respectively. The animation covers two successive dislocation processes. Read the article for free for a limited time: https://goo.gl/4qNjvK

"Planar non-Newtonian confined laminar impinging jets: Hysteresis, linear stability, and periodic flow" When the flow of an impinging jet is disturbed it may become unsteady and exhibit periodic oscillations. This paper uses computer based methods to determine conditions for such instability and calculates the resulting periodic behavior for a fluid whose properties depend on the speed of the jet. For a limited time, read the article for free: https://goo.gl/VUhvig

What does fuel injection in scramjets have in common with supernovae? Both cases exhibit substantial shock-induced turbulent mixing, which increases fuel mixing leading to faster reactions in the former case, and contributes to supernova remnant formation in the latter case. "Late-time growth rate, mixing, and anisotropy in the multimode narrowband Richtmyer–Meshkov instability: The θ-group collaboration" presents a detailed investigation of the physics of this instability via a new benchmark case undertaken by seven independent codes in eight separate institutions. You can read the article for free here: https://goo.gl/ooUKH1

The most interesting phenomena take place in a two-layer system if there are two independent factors creating the temperture gradient, namely, external heating/cooling from the solid substrate or gas phase and the interfacial heat source/sink. "Novel criteria for the development of monotonic and oscillatory instabilities in a two-layer film" explores how the interplay of both factors can be used for controlling of instabilities. For a limited time, you can read the article for free here: https://goo.gl/9gAupt

The dynamics of mantle–core coupling of our planet is one of the important topics in earth science. In the article "Heat transport and coupling modes in Rayleigh–Bénard convection occurring between two layers with largely different viscosities," new numerical simulations reveal that thermal convection in the highly viscous mantle controls the convective style in the low-viscosity outer core via thermal and mechanical interactions at the core–mantle boundary. The article can be read for free for a limited time here - https://goo.gl/ZV3ydV

Morphology of drop impact on a superhydrophobic surface with m...

Water drop (diameter D) impacting onto the tip of the linear ridge-like macro-structures on a superhydrophobic surface has reduced lift-off time up to 50%. In the article "Morphology of drop impact on a superhydrophobic surface with macro-structures", we study the variation of lift-off time when impacted onto multiple parallel ridges (at ridge center and valley center) with varying pitch (p) and show p ~ D is optimum configuration. You can read the article for free here: https://goo.gl/Q364Yf

"Phase-field simulation of counter-current spontaneous imbibition in a fractured heterogeneous porous medium" presents the results of a new pore-level numerical study of counter-current spontaneous imbibition, using coupled Cahn–Hilliard phase field and Navier–Stokes equations, solved by finite element method. The effects of wettability, viscosity ratio and interfacial tension were investigated. The results of this numerical study confirmed the ability of phase field model to realistically predict pore-level mechanisms during counter-current spontaneous imbibition process. You can read the article for free here https://goo.gl/mYXyHu

DNS results of a turbulent flow in a channel laden with resolved air bubbles clustered near the wall are presented in "Turbulent water flow in a channel at Reτ = 400 laden with 0.25 mm diameter air-bubbles clustered near the wall." New insight is revealed as to the clustering and departure of the bubbles in the flow zone populated by high-speed streaks, and to the effect on turbulent stress distribution. Based on the authors' knowledge, this is the first study to shed light on the effects of bubbles on wall turbulence. You can read the full article for free here https://goo.gl/BnBRZk

Self-propulsion of a flexible plate near the ground is investigated. Besides a moderate rigidity, an appropriate density ratio between the plate and fluid (M) can improve the propulsive efficiency. The intuition that increase of the propulsive speed is at the expense of the rising input power is invalid as M>0.7. The video shows the pressure distribution around the plate under ground effect when M=0.9. The ground effect inhibits the plate's deformation and decreases the input work compared to the case without ground. You can read the article "Free locomotion of a flexible plate near the ground" for free here - https://goo.gl/pu9opd

In this #POFFeaturedArticle, the authors use a 3D continuum model of the red blood cell (RBC) to numerically replicate the classic shear flow go-and-stop experiment of Fischer (2004). This is the first 3D numerical simulation to predict the complete shape memory of RBCs. They observe that the process has multiple widely disparate time scales many of which are orders of magnitude longer than what was typically observed in optical tweezing and micropipette based stretch-relaxation experiments. You can read the article for free here - https://goo.gl/k4gbn8

High-speed video of water entry/exit of a flexible wedge from the authors of the article "Hydroelastic slamming of flexible wedges: Modeling and experiments from water entry to exit". Read the article for free here - https://goo.gl/yfY79F

The authors use confocal microscopy to observe the morphological behaviors of bubble evolution on submerged hydrophobic microstructures under reduced pressures. They compare the experimental results to the predictions from a diffusion-based model. These analyses can be used to optimize the design of structured hydrophobic surfaces so as to control the morphology. You can read the full article here - https://goo.gl/BHjJtG

We look at the footprints of the fluid flowing around a cylinder’s body. The story is told from the point of view of the cylinder’s surface by firstly measuring the fluid scrub on the Temperature-Sensitive coating, then by reconstructing some of the 3D coherent structures impinging on the cylinder. You can read the article for free here - https://goo.gl/K1CBvJ

Small-scale dynamics are the spirit of turbulence physics. It implicates fundamental perspectives of the flow topology, the hairpin vorticity dynamics and the mechanism of kinetic energy cascade. In this article, new frontiers in the small-scale dynamics pertaining to its universal kinetic features and thermals are explored in turbulent Rayleigh-Bénard convection. You can read the article for free here - https://goo.gl/nBkAoG

In this #POFEdPick, granular materials handled in industry, such as grains, pharmaceutical pills, minerals, etc., are all non-spherical. To gain a better understanding of the flow behaviour of such materials during processing, we study an idealised system in detail by means of numerical simulations: the flow of dumbbells in shear flows. Read the article for free here - https://goo.gl/GrFIzB IIT Bombay