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Full-Text Articles in Physics
Analogy Between Thermodynamic Phase Transitions And Creeping Flows In Rectangular Cavities, Miron Kaufman, Petru S. Fodor
Analogy Between Thermodynamic Phase Transitions And Creeping Flows In Rectangular Cavities, Miron Kaufman, Petru S. Fodor
Physics Faculty Publications
© 2020, MDPI AG. All rights reserved. An analogy is found between the streamline function corresponding to Stokes flows in rectangular cavities and the thermodynamics of phase transitions and critical points. In a rectangular cavity flow, with no-slip boundary conditions at the walls, the corners are fixed points. The corners defined by a stationary and a moving wall, are found to be analogous to a thermodynamic first-order transition point. In contrast, the corners defined by two stationary walls correspond to thermodynamic critical points. Here, flow structures, also known as Moffatt eddies, form and act as stagnation regions where mixing is …
Size Dependence In Chord Characteristics From Simulated And Observed Continental Shallow Cumulus, Philipp J. Griewank, Thijs Heus, Neil P. Lareau, Roel A. J. Neggers
Size Dependence In Chord Characteristics From Simulated And Observed Continental Shallow Cumulus, Philipp J. Griewank, Thijs Heus, Neil P. Lareau, Roel A. J. Neggers
Physics Faculty Publications
© 2020 American Institute of Physics Inc.. All rights reserved. In this study we compare long-Term Doppler and Raman lidar observations against a full month of large eddy simulations of continental shallow cumulus clouds. The goal is to evaluate if the simulations can reproduce the mean observed vertical velocity and moisture structure of cumulus clouds and their associated subcloud circulations, as well as to establish if these properties depend on the size of the cloud.We propose methods to compare continuous chords of cloud detected from Doppler and Raman lidars with equivalent chords derived from 1D and 3D model output. While …
Dynamics Of Subsiding Shells In Actively Growing Clouds With Vertical Updrafts, Vishnu Nair, Thijs Heus, Maarten Van Reeuwijk
Dynamics Of Subsiding Shells In Actively Growing Clouds With Vertical Updrafts, Vishnu Nair, Thijs Heus, Maarten Van Reeuwijk
Physics Faculty Publications
© 2020 American Meteorological Society. The dynamics of a subsiding shell at the edges of actively growing shallow cumulus clouds with updrafts is analyzed using direct numerical simulation. The actively growing clouds have a fixed in-cloud buoyancy and velocity. Turbulent mixing and evaporative cooling at the cloud edges generate a subsiding shell that grows with time. A self-similar regime is observed for first-and second-order moments when normalized with respective maximum values. Internal scales derived from integral properties of the flow problem are identified. A self-similarity analysis using these scales reveals that contrary to classical self-similar flows, the turbulent kinetic energy …
Primary Cilia Have A Length-Dependent Persistence Length, Justin Flaherty, Zhe Feng, Zhangli Peng, Y. N. Young, Andrew Resnick
Primary Cilia Have A Length-Dependent Persistence Length, Justin Flaherty, Zhe Feng, Zhangli Peng, Y. N. Young, Andrew Resnick
Physics Faculty Publications
© 2019, The Author(s). The fluctuating position of an optically trapped cilium tip under untreated and Taxol-treated conditions was used to characterize mechanical properties of the cilium axoneme and its basal body by combining experimental, analytical,and computational tools. We provide, for the first time, evidence that the persistence length of a ciliary axoneme is length-dependent; longer cilia are stiffer than shorter cilia. We demonstrate that this apparent length dependence can be understood by a combination of modeling axonemal microtubules as anisotropic elastic shells and including actomyosin-driven stochastic basal body motion.Our results also demonstrate the possibility of using observable ciliary dynamics …
Sociophysics Analysis Of Multi-Group Conflicts, Miron Kaufman, Hung T. Diep, Sanda Kaufman
Sociophysics Analysis Of Multi-Group Conflicts, Miron Kaufman, Hung T. Diep, Sanda Kaufman
Physics Faculty Publications
© 2020 by the authors. We present our research on the application of statistical physics techniques to multi-group social conflicts. We identify real conflict situations of which the characteristics correspond to the model. We offer realistic assumptions about conflict behaviors that get factored into model-generated scenarios. The scenarios can inform conflict research and strategies for conflict management. We discuss model applications to two-and three-group conflicts. We identify chaotic time evolution of mean attitudes and the occurrence of strange attractors. We examine the role that the range of interactions plays with respect to the occurrence of chaotic behavior.