Article
Mechanics
G. Gravina, S. Schwarzacher, O. Soucek, K. Tuma
Summary: In this paper, the phenomenon of particle rebound in a viscous incompressible fluid environment is investigated. The focus is on the important case of no-slip boundary conditions, and conditions are provided to prove that rebound is possible even without topological contact. Numerical simulations are compared with solutions obtained from established partial differential equations to support the conjecture that a qualitative change in the shape of the solid is necessary for a physically meaningful rebound in fluids.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Julian Restrepo, Jose R. Simoes-Moreira
Summary: This study investigates the viscous effects on an ideal gas flow in a supersonic convergent-divergent nozzle using a realistic equation of state. The study discusses the influence of the Gruneisen parameter, viscous and real gas effects on the formation of the sonic point, and calculates the maximum values of the discharge coefficient and the isentropic nozzle efficiency. Furthermore, the study evaluates the formation and intensity of normal shock waves using the Rankine-Hugoniot relations, which now depend on real gas and viscous effects.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Alessandro Ferrari
Summary: New analytical solutions have been obtained for the one-dimensional steady-state compressible viscous adiabatic flow of an ideal gas through a conical nozzle or diffuser. The solutions have been validated through dimensionless representation and fluid dynamics analysis for both subsonic and supersonic flows. The proposed solutions complement existing models and expand the collection of exact solutions in gas dynamics.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Masahiro Kondo, Takahiro Fujiwara, Issei Masaie, Junichi Matsumoto
Summary: The study developed a physically consistent particle method for high-viscous free-surface flows, and its performance was verified by calculating various flow situations.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Mechanics
Arghya Samanta
Summary: The study focuses on the linear spatiotemporal instability of a two-dimensional gravity-driven viscous fluid flow with imposed shear stress. The numerical solution identifies four spatial branches and analyzes the destabilizing effect of increased shear stress on spatial growth rate. Analysis of absolute and convective instabilities is conducted using saddle point technique and collision criterion within the framework.
Article
Mechanics
Fang Li, Xie-Yuan Yin, Xie-Zhen Yin
Summary: This study investigates small-amplitude shape oscillations of a viscous compound droplet suspended in a viscous host fluid. The dominant l = 2 mode and the existence of in-phase and out-of-phase oscillatory modes are identified. Various non-dimensional parameters are examined, and the effects of viscosity, density contrasts, and shell thickness on the oscillations are analyzed. The study also discusses the critical values and bifurcations that lead to aperiodic behavior in the droplet oscillations.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Energy & Fuels
Benedicta N. Nwani, Ian D. Gates, Anne M. Benneker
Summary: The control of interfacial instabilities using an external electric field has been proven to be feasible. The addition of anionic and cationic surfactants significantly changes the system behavior, and the system response depends on the charge of the surfactant. Changing the direction of the electric field impacts the overall displacement, but the effect of interfacial charges induced by the ionic surfactants stays consistent.
Article
Physics, Fluids & Plasmas
Jun-Yong Lee, Jae Hoon Lee, Bohdan Lev, Jong-Hyun Kim
Summary: This study presents a new perspective to investigate the effects of local flow on nematic liquid crystals. The research reveals the impact of local flow on the director orientation, as well as the relationship between the director angle and the flow angle. The study also analyzes the changes in the influenced region, such as its size and interference pattern appearance.
Article
Engineering, Marine
Meng Guo, Cheng Liu, Shiqi Liu, Jiahua Zhang, Zhifang Ke, Qingdong Yan, Boo Cheong Khoo
Summary: This study proposed and developed a visualization experimental system to investigate the cavitation properties of viscous fluids, and a three-dimensional computational fluid dynamics (CFD) model based on the finite volume method (FVM) to study the cavitation characteristics and unsteady cavitation behaviors. The results showed that cavitation started on the suction surface of the hydrofoil near the head, and the critical cavitation number and the critical velocity were 5.2 and 10 m/s at an operating pressure of zero. The cavitation process of the viscous oil around the hydrofoil was highly unstable and periodic, with an evolution frequency of 47 Hz.
Article
Mechanics
Jie Yao, Weiyu Shen, Yue Yang, Fazle Hussain
Summary: The dynamics of two slender Hopf-linked vortex rings were studied at different vortex Reynolds numbers, revealing that at high Re, the vortex rings reconnected to form smaller rings that then broke up into turbulent clouds. The global helicity H was not conserved at very high Re, with twist playing a significant role in helicity dynamics at high Re.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Physics, Multidisciplinary
Ping Tang, Ryo Iguchi, Ken-ichi Uchida, Gerrit E. W. Bauer
Summary: We present a scattering theory for polarization and heat transport in a ballistic ferroelectric point contact. We predict the presence of a polarization current under either an electric field or a temperature difference, which strongly depends on the direction of the ferroelectric order and can be detected through its magnetic stray field, thermovoltage, and Peltier effect.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mechanics
Toshan Lal Sahu, Ujjwal Chetan, Jagannath Mahato, Prabir Kumar Kar, Prasanta Kumar Das, Rajaram Lakkaraju
Summary: In this study, the breakup morphology of a swirling liquid jet is analyzed through numerical simulations. It is found that viscous forces dominate the flow and suppress the Kelvin-Helmholtz instability at the interface, while centrifugal instability destabilizes the helical rim and leads to the formation of droplets.
Article
Physics, Multidisciplinary
Ge Zhang, Sean A. Ridout, Andrea J. Liu
Summary: This study investigates avalanches of particle rearrangements in jammed soft disks under quasistatic shear. By introducing a framework for understanding the statistics of avalanches, the research identifies a correlation between softness and rearrangements, showing that softness serves as a useful proxy for local yield strain. The findings suggest that elastoplastic models should incorporate a fully tensorial strain field to include the effects of changes in local yield strain due to rearrangements.
Article
Multidisciplinary Sciences
M. Ibarias, J. Doporto, A. A. Krokhin, J. Arriaga
Summary: Using analytical results, this study investigates the dissipation of sound waves in phononic crystals. The study finds that the effective acoustic viscosity of the phononic crystal can exceed the natural hydrodynamic viscosity of the background fluid by several orders of magnitude, and the decay coefficient is dependent on the direction of propagation. The variety in filling fraction of solid scatterers allows for tuning the dissipative decay length of sound, which is crucial for acoustic devices.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Multidisciplinary Sciences
Yaolong Li, Pengzuo Jiang, Xiaying Lyu, Xiaofang Li, Huixin Qi, Jinglin Tang, Zhaohang Xue, Hong Yang, Guowei Lu, Quan Sun, Xiaoyong Hu, Yunan Gao, Qihuang Gong
Summary: In this study, the authors characterized the near-field dielectric modes and photoemission properties of insulating hexagonal boron nitride structures using time-resolved photoemission electron microscopy (TR-PEEM). They revealed static vector near-field vortices with different topological charges and the spatiotemporal evolution of waveguide modes in a low-loss dielectric planar waveguide. Their approach provides a strategy for the realization of flat photoemission emitters.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Fluids & Plasmas
G. Almondo, J. Einarsson, J. R. Angilella, B. Mehlig
PHYSICAL REVIEW FLUIDS
(2018)
Article
Mechanics
R. Mehaddi, F. Candelier, B. Mehlig
JOURNAL OF FLUID MECHANICS
(2018)
Article
Chemistry, Physical
Jens Krog, Mohammadreza Alizadehheidari, Erik Werner, Santosh Kumar Bikkarolla, Jonas O. Tegenfeldt, Bernhard Mehlig, Michael A. Lomholt, Fredrik Westerlund, Tobias Ambjornsson
JOURNAL OF CHEMICAL PHYSICS
(2018)
Article
Mechanics
Fabien Candelier, Bernhard Mehlig, Jacques Magnaudet
JOURNAL OF FLUID MECHANICS
(2019)
Article
Physics, Fluids & Plasmas
L. Zhao, K. Gustaysson, R. Ni, S. Kramel, G. A. Voth, H. Andersson, B. Mehlig
PHYSICAL REVIEW FLUIDS
(2019)
Article
Physics, Multidisciplinary
K. Gustaysson, M. Z. Sheikh, D. Lopez, A. Naso, A. Pumir, B. Mehlig
NEW JOURNAL OF PHYSICS
(2019)
Article
Physics, Multidisciplinary
M. Borgnino, K. Gustavsson, F. De Lillo, G. Boffetta, M. Cencini, B. Mehlig
PHYSICAL REVIEW LETTERS
(2019)
Article
Mechanics
Muhammad Zubair Sheikh, Kristian Gustavsson, Diego Lopez, Emmanuel Leveque, Bernhard Mehlig, Alain Pumir, Aurore Naso
JOURNAL OF FLUID MECHANICS
(2020)
Article
Physics, Multidisciplinary
J. Meibohm, K. Gustavsson, J. Bec, B. Mehlig
NEW JOURNAL OF PHYSICS
(2020)
Article
Mechanics
Z. Cui, A. Dubey, L. Zhao, B. Mehlig
JOURNAL OF FLUID MECHANICS
(2020)
Article
Multidisciplinary Sciences
Martin Mojica-Benavides, David D. van Niekerk, Mite Mijalkov, Jacky L. Snoep, Bernhard Mehlig, Giovanni Volpe, Mattias Goksor, Caroline B. Adiels
Summary: This study utilized a diffusion-limited microfluidic system to mimic the structure of a multicellular organ, demonstrating that a group of oscillating yeast cells can form subpopulations of spatially differentiated and temporally synchronized cells under certain conditions. The intricate interplay of intracellular biochemical reaction networks and intercellular communication, along with the fluid dynamics of the reaction chamber, plays a critical role in generating the synchronized cell populations. The results of the study, which were experimentally tested and reproducible, suggest that the observed spontaneous community development resembles zoned cell differentiation in multicellular organs.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Fluids & Plasmas
F. Jiang, L. Zhao, H. Andersson, K. Gustavsson, A. Pumir, B. Mehlig
Summary: The study investigates the torque acting on particles in a uniform flow by numerically solving the Navier-Stokes equations. It shows that the angular dependence of the torque remains qualitatively correct for low Reynolds numbers, but systematic deviations from theoretical predictions occur as Reynolds numbers increase. The numerical results provide justification for recent theories on the orientation statistics of ice crystals in turbulent flow.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Physics, Fluids & Plasmas
J. Meibohm, B. Mehlig
Article
Evolutionary Biology
Anja M. Westram, Marina Rafajlovic, Pragya Chaube, Rui Faria, Tomas Larsson, Marina Panova, Mark Ravinet, Anders Blomberg, Bernhard Mehlig, Kerstin Johannesson, Roger Butlin
Article
Physics, Fluids & Plasmas
Akshay Bhatnagar, K. Gustavsson, B. Mehlig, Dhrubaditya Mitra