Article
Mechanics
Paul Andrade, Yannis Hardalupas, Georgios Charalampous
Summary: This study uses a combination of graph theory and Voronoi analysis to investigate the structure and internal sub-structure of clusters. Experimental results show that large clusters have a significantly large number of neighboring particles for collisions, while small clusters have a random number of neighbors.
Article
Mathematics
Leonid I. Piterbarg
Summary: The study focuses on stochastic flows mimicking 2D turbulence in compressible media, analyzing collision frequency and conditions for caustic occurrence. By deriving a system of nonlinear stochastic differential equations involving the Jacobian and simplifying it, upper and lower bounds for the mean number of caustics are found, with verification of exact asymptotic for small Stokes numbers. Rigorous proofs of well-known expressions for caustic frequency and Lyapunov exponent in the one-dimensional model are also provided.
Article
Physics, Multidisciplinary
A. Fuchs, C. Herbert, J. Rolland, M. Wachter, F. Bouchet, J. Peinke
Summary: This study examines the intermittency phenomenon and cascade trajectories in turbulent flows. The concept of an instanton, representing the optimal path among selected trajectories, is introduced to explain the emergence of non-Gaussian statistics at small scales.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mechanics
K. Shri Vignesh, Shruti Tandon, Praveen Kasthuri, R. I. Sujith
Summary: This study introduces a method of analyzing the dynamics of particle-laden flows using complex networks from a Lagrangian perspective. By utilizing this approach, local and global clustering characteristics of particles can be obtained simultaneously, providing insight into the dynamics of particle clustering in flow fields.
Article
Energy & Fuels
Guodong Gai, Olivier Thomine, Abdellah Hadjadj, Sergey Kudriakov, Anthony Wachs
Summary: The impact of gravity on particle preferential concentration is studied using direct numerical simulations in an Eulerian-Lagrangian framework for a wide range of Stokes numbers St(n) from 0.01 to 4. Gravity has a minor effect on the spatial distribution of particles in turbulence for small Stokes numbers like St(n) = 0.01. However, as St(n) increases, stripped structures of high particle density appear and expand along the gravity direction.
Article
Environmental Sciences
Shuolin Li, Andrew D. Bragg, Gabriel Katul
Summary: The article discusses the vertical distribution of suspended sediment concentration and derives the turbulent flux of sediments using a co-spectral budget model, which can be used in suspended sediment and other fine particle transport models.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Shuolin Li, Andrew D. Bragg, Gabriel Katul
Summary: This study investigates the behavior of suspended particles in turbulent flows and discusses the difference in particle settling velocity in turbulence and still water. By incorporating virtual mass and Basset history forces, the inconsistencies between conventional models and laboratory experiments are resolved. This research is significant for modeling particle settling in turbulence.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Mechanics
Kyle Pietrzyk, Jeremy A. K. Horwitz, Fady M. Najjar, Roger W. Minich
Summary: This study analyzes particle-laden, isotropic turbulence in three dimensions to understand the dynamics of inertial particles from a kinetic energy perspective. By identifying data trends, it is found that particles tend to accumulate in regions of low flow kinetic energy over time, as they lose kinetic energy and slow down in such regions. A particle kinetic energy equation is derived and hypotheses regarding the temporal change of particle kinetic energy and particle behavior are evaluated using simulation data. The steady-state probability density function of particle kinetic energy is derived using a Fokker-Planck equation. The model fits the simulation data well and provides a tool for investigating preferential concentration and predicting particle kinetic energy in turbulent flows.
Article
Engineering, Chemical
Min Liu, Jun Yao, Yanlin Zhao
Summary: This study investigates the characteristics of particle behavior in turbulent sedimentary duct flows, revealing that particles of different sizes are influenced by different factors in the flow field, providing important insights for further research.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
F. Serafini, F. Battista, P. Gualtieri, C. M. Casciola
Summary: In DNA suspensions, the maximal drag reduction is achieved when the macromolecules are fully stretched, contrary to the assumptions of classical viscoelastic models.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Benjamin De Bruyne, Satya N. Majumdar, Gregory Schehr
Summary: The proposed method generates bridge run-and-tumble trajectories with specified starting and ending conditions for different types of constrained particles, showing high efficiency in numerical implementation.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Mechanics
Davide Perrone, J. G. M. Kuerten, Luca Ridolfi, Stefania Scarsoglio
Summary: Mixing of inertial point particles in turbulent channel flow at Re-z = 950 is studied using direct numerical simulations. The study considers the release of inertial particles, with varying Stokes number, from different positions inside the channel and analyzes their rate of coming close to each other. A Lagrangian framework is employed to analyze trajectories and study mixing and dispersion problems. The research provides a comprehensive understanding of mixing in an anisotropic turbulent flow by varying the release position of particles along the wall-normal direction. Moreover, the effects of particle inertia are analyzed and found to depend on the position and alignment of the sources due to the dependence of the flow timescales on the distance from the wall.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Thermodynamics
Alexandre Fabregat, Jordi Pallares
Summary: Airborne particle transport and deposition on solid surfaces are crucial in aerosol deposition, infectious diseases transmission, and surface soiling. Fluids disperse particles through various forces, influenced by density ratio and particle size. The boundary layers and these parameters control the localized wall deposition rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Stefano Olivieri, Ianto Cannon, Marco E. Rosti
Summary: This study investigates the modulation of turbulence caused by the presence of finite-size dispersed particles. Bluff (isotropic) spheres and slender (anisotropic) fibres are compared to understand how the shape of the objects influences the carrier flow. While both objects, at a fixed mass fraction but different Stokes number, lead to similar bulk effects characterized by large-scale energy depletion, a scale-by-scale analysis reveals intrinsic differences in the alteration of the whole spectrum. For bluff objects, the classical energy cascade shrinks in its extension but retains its energy content and typical features, while for slender objects, an alternative energy flux mediated by fluid-solid coupling is found.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Jun Ho Lee, Hyunseok Kim, Jubeom Lee, Hyungmin Park
Summary: In this study, upward turbulent bubbly pipe flow was investigated to understand the bubble-induced turbulence modulation of the liquid-phase flow. Using two-phase particle image velocimetry, bubbly flow fields in a vertical pipe were obtained for different Reynolds numbers, revealing that bubbles energize flow structures at different length scales, enhancing turbulence across the entire pipe. Moreover, the highest void fraction observed led to local turbulence suppression near the pipe wall due to milder liquid velocity gradients.
Article
Biochemical Research Methods
D. Odman, E. Werner, K. D. Dorfman, C. R. Doering, B. Mehlig
Article
Mechanics
J. Fries, M. Vijay Kumar, B. Mekonnen Mihiretie, D. Hanstorp, B. Mehlig
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
