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Coupled Fluid Density and Motion from Single Views [article]

Marie-Lena Eckert, Wolfgang Heidrich, Nils Thuerey
2018 arXiv   pre-print
We present a novel method to reconstruct a fluid's 3D density and motion based on just a single sequence of images.  ...  More specifically, we propose a novel strategy to infer density updates strongly coupled to previous and current estimates of the flow motion.  ...  Thuerey / Coupled Fluid Density and Motion from Single Views velocities in one voxel row to be zero inside the density volume.  ... 
arXiv:1806.06613v1 fatcat:ubid6r6uabfcfbswvsibcuyxaa

Screen space animation of fire

Martin Guay, Fabrice Colin, Richard Egli
2011 SIGGRAPH Asia 2011 Sketches on - SA '11  
Figure 1 : Ignited bunnies seen from different views.  ...  In our method, the apparent motion of the fire on the viewing axis is mimicked by introducing vibrations in the velocity field.  ...  Introduction It was noted in [Horvath and Geiger 2009 ] that the motion of fire on the viewing direction is less important than the motion spanning the viewing plane.  ... 
doi:10.1145/2077378.2077391 fatcat:3hbx6zrccbaz7f3n4aeoizguq4

A field theory approach to the evolution of canonical helicity and energy

S. You
2016 Physics of Plasmas  
A redefinition of the Lagrangian of a multi-particle system in fields reformulates the single-particle, kinetic, and fluid equations governing fluid and plasma dynamics as a single set of generalized Maxwell's  ...  The Lagrangian includes new terms representing the coupling between the motion of particle distributions, between distributions and electromagnetic fields, with relativistic contributions.  ...  The author would like to acknowledge one of the referees for pointing out Refs. 18 and 19. These earlier works partly explored some of the connections presented here.  ... 
doi:10.1063/1.4956465 fatcat:fzedgxg57jf67lrwcwxi2z7mn4

Numerical Study of RBC Motion and Deformation through Microcapillary in Alcohol Plasma Solution

Aleksey Ni, Taqi Ahmad Cheema, Cheol Woo Park
2015 Open Journal of Fluid Dynamics  
In this study, a finite element method-based moving mesh technique was applied to simulate the motion and deformation of a single RBC under different flow conditions.  ...  Cell deformability and stability were studied in an alcoholic plasma solution at different fluid flow conditions.  ...  mechanism from a micro-scale point of view.  ... 
doi:10.4236/ojfd.2015.51004 fatcat:2unkdo6cgfaw7i6f5w2bwtgv4q

Diaphragm Motion Affects Flow Patterns in an Artificial Heart

Pramote Hochareon, Keefe B. Manning, Arnold A. Fontaine, Steven Deutsch, John M. Tarbell
2003 Artificial Organs  
Experiments were conducted to determine the influence of diaphragm motion on the flow characteristics by altering the filling pressure, diaphragm thickness, and fluid density.  ...  In the sac-driven artificial heart, the flow characteristics are coupled to the dynamics of the sac motion.  ...  Changes in prestretch, diaphragm thickness, and fluid density minimally affect the diaphragm motion and thus the vortex pattern developing during diastole.  ... 
doi:10.1111/j.1525-1594.2003.07206.x pmid:14678424 fatcat:azsrvfc6frgzjkr5belshpvkve

DYNAMIC COUPLING OF MULTI-PHASE FLUIDS WITH A MOVING OBSTACLE

Tso-Ren Wu, Chih-Jung Huang, Mei-Hui Chuang, Chung-Yue Wang, Chia-Ren Chu
2011 Journal of Marine Science and Technology  
This model allows obstacles moving in the multi-phase fluids to generate realistic motion for both the fluids and obstacles.  ...  In this paper, we present a two-way coupled moving solid algorithm with discrete element method (DEM) to simulate dynamic fluid-solid interaction.  ...  The air density is set to 0.0 kg/m 3 and is excluded from the Fig. 4 . 4 The side view of the centerline cross section of landslide setup.  ... 
doi:10.51400/2709-6998.2206 fatcat:7yflqqbnwbhp7a66rcipi2hihm

Cluster formation and self-assembly in stratified fluids: a novel mechanism for particulate aggregation [article]

Roberto Camassa, Daniel M. Harris, Robert Hunt, Zeliha Kilic, and Richard M. McLaughlin
2019 arXiv   pre-print
These fluid systems all have stable density stratification, which is known to trap particulates through upper lightweight fluid coating the sinking particles, thus providing transient buoyancy.  ...  An extremely broad and important class of phenomena in nature involves the settling and aggregation of matter under gravitation in fluid systems.  ...  For our studies, the sphere and spheroids are symmetric, and thus no selfinduced motion is generated by a single body in isolation.  ... 
arXiv:1905.07610v1 fatcat:n5n4zdhbenhltojeqsfcdffovu

Numerical simulation of solid particle behaviors in fluid flow by using a numerical method coupling technique

Satoshi OHTSUKI, Toshifumi MATSUOKA
2009 International Journal of the JCRM  
With the coupling of both methods, the complex motions of solid particles in a fluid flow can be simulated.  ...  To verify this, the sedimentation behavior of a single circular particle is simulated in a fluid with different Reynolds numbers, and the results are compared with FEM.  ...  From this point of view, the coupled LBM and DEM methodology is probably a more promising approach.  ... 
doi:10.11187/ijjcrm.4.61 fatcat:eozewdd52badzhqdrzlmmlyusu

Hydro‐micromechanical modeling of wave propagation in saturated granular crystals

Hongyang Cheng, Stefan Luding, Nicolás Rivas, Jens Harting, Vanessa Magnanimo
2019 International journal for numerical and analytical methods in geomechanics (Print)  
Solid and fluid phases are two-way coupled through momentum exchange. The coupling scheme is benchmarked with the terminal velocity of a single sphere settling in a fluid.  ...  Biot's theory predicts the wave velocities of a saturated poroelastic granular medium from the elastic properties, density and geometry of its dry solid matrix and the pore fluid, neglecting the interaction  ...  We acknowledge support from the European Space Agency (ESA) contract 4000115113 "Soft Matter Dynamics" and the European Cooperation in Science and Technology (COST) ActionMP1305 "Flowing matter."  ... 
doi:10.1002/nag.2920 fatcat:fxzm3urow5bv5h6uv3f7w4tfuy

A lattice Boltzmann model with random dynamical constraints

A. Lamura, S. Succi
2004 European Physical Journal B : Condensed Matter Physics  
It is found that the non-linearly coupled dynamics of the fluid and obstacles produces heterogeneous patterns in fluid density and non-exponential relaxation of two-time autocorrelation function.  ...  Fluid motion is described by a lattice Boltzmann equation and obstacles are randomly distributed semi-permeable barriers which constrain the motion of the fluid particles.  ...  coupled to fluid motion.  ... 
doi:10.1140/epjb/e2004-00187-8 fatcat:gquz7ykprbal7fdylp62lu2pmu

Collaboration and competition between active sheets for self-propelled particles

Abhrajit Laskar, Oleg E. Shklyaev, Anna C. Balazs
2019 Proceedings of the National Academy of Sciences of the United States of America  
This design couples two different mechanisms for chemically generating motion in fluid-filled microchambers: solutal buoyancy and diffusiophoresis.  ...  Via the solutal buoyancy mechanism, the density variations generate fluid flows, which modify the shape and motility of the crabs.  ...  This design couples two different mechanisms for chemically generating motion in fluid-filled microchambers: solutal buoyancy and diffusiophoresis.  ... 
doi:10.1073/pnas.1901235116 pmid:31019092 pmcid:PMC6511051 fatcat:purxltmvsnby7j3r3ssbejpb2y

Anomalous scaling of flexural phonon damping in nanoresonators with confined fluid

Subhadeep De, Narayana R. Aluru
2019 Microsystems & Nanoengineering  
Here, we report the mechanical damping behavior of a 1D single-walled carbon nanotube (SWCNT) resonator operating in the fundamental flexural mode and interacting with a fluid environment, where the fluid  ...  A scaling study of dissipation shows an anomalous behavior in case of interior fluid where the dissipation is found to be extremely low and scaling inversely with the fluid density.  ...  which is supported by funds from the University of Illinois at Urbana-Champaign.  ... 
doi:10.1038/s41378-018-0041-2 pmid:31057929 pmcid:PMC6330506 fatcat:ufdbt5fl35fxzdpx22xvvrcux4

Numerical Simulation of the Gas-Solid Flow by DEM-CFD Approach with Application to a Spouted Bed

Jinhe FAN, Guoxian XIAO
2014 Sensors & Transducers  
The paper presents a computational study of the gas-solid flow in a three- dimensional spouted bed by a combined approach of discrete element method and computational fluid dynamics (DEM-CFD).The coupling  ...  density, pressure drop and its swing is increased markedly.  ...  The coupling relation between gas phase and solid phase realizes through Newton's third law of motion.  ... 
doaj:7c77ce3616f34a87aed5278de51e2cbf fatcat:odyufw4m5jdz7bkbbn73e43xta

Covariantizing the interaction between dark energy and dark matter

Valerio Faraoni, James B. Dent, Emmanuel N. Saridakis
2014 Physical Review D  
Coupling dark energy and dark matter through an effective fluid description is a very common procedure in cosmology, however it always remains in comoving coordinates in the special FLRW space.  ...  Nevertheless, we present a formal solution to this problem for a single fluid, through the introduction of an effective metric.  ...  From the point of view of fluid 2, one can think of a perfect fluid from which a dust with negative energy density −2α removes energy to transfer it to fluid 1.  ... 
doi:10.1103/physrevd.90.063510 fatcat:ddwax5czyjbkzbul3u2knxdsry

Glass-like dynamics of collective cell migration

T. E. Angelini, E. Hannezo, X. Trepat, M. Marquez, J. J. Fredberg, D. A. Weitz
2011 Proceedings of the National Academy of Sciences of the United States of America  
However, single cells are highly deformable and their motions are self-generated; thus to understand the duality of the fluid-like and solid-like properties of a cell layer, it is essential to measure  ...  Within the cell layer, however, the details of these characteristic motions arise from single-cell-body deformations and cell proliferation: it is this internal activity that distinguishes confluent tissue-cell  ...  At the lowest cell densities, nðωÞ∕ω resembles that of molecular and colloidal fluids: there is a single, dominant peak at low frequencies and the DOS decreases and flattens out at high frequencies, as  ... 
doi:10.1073/pnas.1010059108 pmid:21321233 pmcid:PMC3064326 fatcat:mhmdeko7v5cqnfv2yszsnd6vym
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