Article
Mechanics
Xuan Ruan, Sheng Chen, Shuiqing Li
Summary: The study investigates the early-stage agglomeration of identically charged microparticles in homogeneous isotropic turbulence through numerical simulations. It is found that as particle charge increases, the collision frequency changes, and the dominant collision mechanism shifts. In the presence of both Coulomb repulsion and adhesion, particles with moderate collision velocities are more likely to contribute to agglomerates formation.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Duan Z. Zhang
Summary: This study establishes a relationship between ensemble average and nearest particle statistics to study long-range particle interactions and calculate particle sedimentation velocity. Additionally, it introduces an important particle-fluid-particle stress for general multiphase flows.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Manuel Moriche, Daniel Hettmann, Manuel Garcia-Villalba, Markus Uhlmann
Summary: We conducted numerical simulations of heavy non-spherical particles settling under gravity and observed that oblate spheroids form columnar clusters, resulting in enhanced settling velocity. The behavior of many-particle cases is not qualitatively different from single-particle cases, contrary to previous results for spheres. We also analyzed pairwise interactions of oblate spheroids and spheres, finding similar attraction regions but noticeable differences during drafting and tumbling phases, including longer drafting phases and more collision events for free-to-rotate spheroids.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Cheng-Hsien Lee
Summary: This study developed a multiphase model with a novel evolution equation to address the issues of shear-induced volume change and pore-pressure feedback in submarine granular flows simulated using an Eulerian-Eulerian two-phase model. The evolution equation effectively describes the relaxation process of static solid pressure and shear-induced volume change, allowing the model to capture phenomena such as time delays in initiating flows and different collapse processes for differently packed columns.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Jooyeon Park, Hyungmin Park
Summary: In this study, the effects of counter-rotating vortex pairs on particle dispersion patterns in a particle-laden upward jet with a horizontal crossflow were experimentally investigated. The results showed that the dynamics of the flow, influenced by the velocity ratio and particle Stokes number, play a crucial role in particle dispersion. Counter-rotating vortex pairs above the jet exit were found to significantly affect the movement of particles, with different regimes of particle dispersion identified based on Stokes number and velocity ratio.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
S. Beetham, R. O. Fox, J. Capecelatro
Summary: In this study, model closures for multiphase Reynolds-averaged Navier-Stokes (RANS) equations are developed using sparse regression and Eulerian-Lagrangian simulations to ensure accuracy and robustness of the models across different flow conditions. The focus is on capturing the dynamics of gas-particle flows, particularly the generation of particle clusters and interphase momentum exchange, in a compact and algebraic manner.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Vasco Duke-Walker, W. Curtis Maxon, Sahir R. Almuhna, Jacob A. McFarland
Summary: In this study, the effects of evaporation and breakup on mixing induced by SDMI were examined through simulations and compared with experimental results. The evaporation model was validated and a new breakup model was presented for low Reynolds number droplets. Simulation results highlighted the importance of breakup parameters on evaporation rate and mixing in SDMI.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
P. D. Huck, R. Osuna-Orozco, N. Machicoane, A. Aliseda
Summary: A study on a canonical co-axial round-jet two-fluid atomizer shows atomization occurring over a wide range of momentum ratios, with a critical momentum ratio of 50 separating low and high dispersion regimes. Results suggest that increasing momentum in the gas phase in the low-momentum regime leads to less droplet dispersion.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
M. Shyam Kumar, Manikandan Mathur, S. R. Chakravarthy
Summary: The study investigates the effects of initial droplet field characteristics on the maximum droplet size growth in turbulent air flow. The research found that the turbulence intensity and initial droplet number density play crucial roles in influencing the droplet size growth rate. Increasing the initial droplet number density can enhance droplet collisions and potentially lead to rapid growth of droplet size under certain conditions.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Sourabh Apte, Thibault Oujia, Keigo Matsuda, Benjamin Kadoch, Xiaoliang He, Kai Schneider
Summary: Direct numerical simulation is used to investigate the effects of turbulent flow on the transport, clustering, and deposition of fine particles in a face-centred cubic porous unit cell. The results show that particle clustering occurs at large volumes and is enhanced with increasing Stokes number.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Meisam Pourali, Nick O. Jaensson, Martin Kroeger
Summary: Translation of a non-spherical particle trapped at a membrane or at a complex interface between fluids is a relevant situation occurring in biological, technological and everyday life systems. The resistance experienced by prolate spheroidal particles at a viscous interface can both rise or decrease with particle size depending on the dimensionless Boussinesq and Marangoni numbers. The distribution of surfactant in the vicinity of the moving spheroid is significantly affected by the particle's immersion depth at a surfactant-laden interface.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Ramandeep Jain, Silvio Tschisgale, Jochen Froehlich
Summary: This study investigates the influence of different non-spherical particle shapes on sediment transport through direct numerical simulations. The results show that particle shape significantly affects both fluid and particle behavior, including parameters such as porosity and bed friction. The findings highlight the importance of considering particle shape in modeling natural sediment transport processes.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Akshay S. Acharya, Srivallabha Deevi, K. Dhivyaraja, Arun K. Tangirala, Mahesh V. Panchagnula
Summary: This empirical study characterizes spray dynamics through time-series analysis of size-velocity data, revealing spatio-temporal correlations and inherent features in the spray. The study also uncovers non-Poisson behavior and heteroskedasticity in the spray data, proposing appropriate models and methods to address these issues. Ultimately, the results are presented as a tool for implementing boundary conditions in computational fluid dynamics.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Stefania Sansone, D. Zugliani, G. Rosatti
Summary: This study analyzes the mathematical models of rock-ice avalanches and proposes a framework for simplified models, which streamline the description of the melting process for easier interpretation and application. The research findings reveal that models of different categories exhibit variations in mathematical properties, requiring further investigation into their causes and numerical implications.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Yiyang Jiang, Yu Guo, Zhaosheng Yu, Xia Hua, Jianzhong Lin, Carl R. Wassgren, Jennifer S. Curtis
Summary: This study investigates gas-fluidized beds of flexible fibers using the discrete element method and computational fluid dynamics. The results show that fiber flexibility affects hydrodynamic forces, pressure drops, and fiber orientation in the bed, with significant impact on solids mixing rates. The study also finds that the pressure drop curves deviate from the Ergun correlation for very flexible fibers due to significant fiber bed expansion before reaching the minimum fluidization velocity.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Vladimir Statnikov, Taraneh Sayadi, Matthias Meinke, Peter Schmid, Wolfgang Schroeder
Article
Computer Science, Interdisciplinary Applications
Lennart Schneiders, Claudia Guenther, Matthias Meinke, Wolfgang Schroeder
JOURNAL OF COMPUTATIONAL PHYSICS
(2016)
Article
Energy & Fuels
Lennart Schneiders, Matthias Meinke, Wolfgang Schroeder
Article
Thermodynamics
K. Froehlich, L. Schneiders, M. Meinke, W. Schroeder
FLOW TURBULENCE AND COMBUSTION
(2018)
Article
Biophysics
I. Hoerschler, W. Schroeder, M. Meinke
JOURNAL OF BIOMECHANICS
(2010)
Article
Mechanics
Lennart Schneiders, Konstantin Froehlich, Matthias Meinke, Wolfgang Schroeder
JOURNAL OF FLUID MECHANICS
(2019)
Article
Engineering, Multidisciplinary
Michael Schlottke-Lakemper, Ansgar Niemoeller, Matthias Meinke, Wolfgang Schroeder
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2019)
Article
Computer Science, Interdisciplinary Applications
Ansgar Niemoeller, Michael Schlottke-Lakemper, Matthias Meinke, Wolfgang Schroeder
COMPUTERS & FLUIDS
(2020)
Article
Mechanics
Andreas Lintermann, Matthias Meinke, Wolfgang Schroeder
INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS
(2020)
Article
Thermodynamics
Seyed Mohsen Alavi Moghadam, Simon Loosen, Matthias Meinke, Wolfgang Schroeder
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2020)
Article
Engineering, Manufacturing
B. Karpuschewski, Th Luebben, M. Meinke, S. Eckert, F. Frerichs, S. Schneider, A. Klink, L. Langenhorst, J. Soelter
Summary: This study analyzed four machining processes – grind hardening, induction hardening, laser hardening, and Electrical Discharge Machining (EDM) – with a focus on their internal material loads and modifications in the surface layer. Numerical simulations and probe measurements were used to study the effects of residual stresses, phase compositions, and the thickness of the transformation zone on material modifications. The results confirmed the relationship between internal material loads and surface layer modifications, showing promising applicability of the Process Signature concept.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2021)
Article
Automation & Control Systems
Ophelia Frotscher, Ingo Schaarschmidt, Daniel Lauwers, Raphael Paul, Matthias Meinke, Philipp Steinert, Andreas Schubert, Wolfgang Schroeder, Markus Richter
Summary: The study aims to understand the magnetic field-assisted electrochemical machining process and lay the foundation for subsequent process simulations, focusing on the influence of the Lorentz force in a NaNO3 electrolyte.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Gonzalo Brito Gadeschi, Thomas Schilden, Marian Albers, Julian Vorspohl, Matthias Meinke, Wolfgang Schroeder
Summary: Efficient removal of material debris by flushing is crucial for the performance and surface quality in electrical discharge machining (EDM). Particle concentration affects the properties of the particle-dielectricum suspension, influencing heat transfer and manufacturing process. Increasing particle loading has a significant impact on heat transfer and the rate of particle flushing out of the cavity.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2021)
Article
Mechanics
Lennart Schneiders, Matthias Meinke, Wolfgang Schroeder
JOURNAL OF FLUID MECHANICS
(2017)
