Euler–Lagrange framework for deformation of granular media coupled with the ambient fluid flow

2021 ◽  
Vol 116 ◽  
pp. 102857
Author(s):  
Naveed Ul Hassan Bhat ◽  
Gourabananda Pahar
Keyword(s):  
Fluid Flow ◽  
Granular Media ◽  
Ambient Fluid

scholarly journals Topological inversions in coalescing granular media control fluid-flow regimes

2017 ◽  
Vol 96 (3) ◽  
Author(s):  
Fabian B. Wadsworth ◽  
Jérémie Vasseur ◽  
Edward W. Llewellin ◽  
Katherine J. Dobson ◽  
Mathieu Colombier ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Granular Media ◽  
Flow Regimes ◽  
Media Control ◽  
Control Fluid ◽  
Fluid Flow Regimes

scholarly journals Combined numerical and experimental study of microstructure and permeability in porous granular media

2020 ◽  
Author(s):  
Philipp Eichheimer ◽  
Marcel Thielmann ◽  
Wakana Fujita ◽  
Gregor J. Golabek ◽  
Michihiko Nakamura ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Numerical Simulations ◽  
Granular Media ◽  
Large Scale ◽  
Earth Science ◽  
Numerical Models ◽  
Effective Porosity ◽  
Flow Properties ◽  
Wide Range ◽  
Flow Through

Abstract. Fluid flow on different scales is of interest for several Earth science disciplines like petrophysics, hydrogeology and volcanology. To parameterize fluid flow in large-scale numerical simulations (e.g. groundwater and volcanic systems), flow properties on the microscale need to be considered. For this purpose experimental and numerical investigations of flow through porous media over a wide range of porosities are necessary. In the present study we sinter glass bead media with various porosities. The microstructure, namely effective porosity and effective specific surface, is investigated using image processing. We determine flow properties like hydraulic tortuosity and permeability using both experimental measurements and numerical simulations. By fitting microstructural and flow properties to porosity, we obtain a modified Kozeny-Carman equation for isotropic low-porosity media, that can be used to simulate permeability in large-scale numerical models. To verify the modified Kozeny-Carman equation we compare it to the computed and measured permeability values.

The impact of fluid flow on force chains in granular media

2017 ◽  
Vol 110 (4) ◽  
pp. 041907 ◽  
Author(s):  
Nariman Mahabadi ◽  
Jaewon Jang
Keyword(s):  
Fluid Flow ◽  
Granular Media ◽  
Force Chains ◽  
The Impact

scholarly journals EDITORIAL: New section – Focus on Fluids

2009 ◽  
Vol 630 ◽  
pp. iii-iii
Keyword(s):  
Fluid Dynamics ◽  
Fluid Flow ◽  
Fluid Mechanics ◽  
Granular Media ◽  
Research Community ◽  
Geophysical Flows ◽  
Experimental Investigations ◽  
Mechanics Of Fluids ◽  
Traditional Fields ◽  
Wave Phenomena

Since its foundation over 50 years ago by George Batchelor, the Journal of Fluid Mechanics has published theoretical, computational and experimental investigations on all aspects of the mechanics of fluids. Over this time, the research community of talented scientists, engineers and mathematicians contributing to the astonishing development of our understanding of fluid flow has grown enormously. This growth has naturally been reflected in the growth of the Journal. In 1956 there were 39 papers published in a single volume of 672 pages, while in 2008 there were 450 papers, extending over nearly 11000 pages and 24 volumes. The array of topics considered has similarly broadened hugely, as a quick scan of the titles of the papers can verify. Building on traditional fields such as aerodynamics, geophysical flows and wave phenomena, research into fluid dynamics has spread into new and exciting areas such as biological flow, granular media, and flows on extremely small physical and time scales.

Effect of ambient fluid flow upon onset of oscillatory thermocapillary convection in half-zone liquid bridge

2005 ◽  
Vol 16 (1-4) ◽  
pp. 176-180 ◽  
Author(s):  
Motoki Irikura ◽  
Yoshihiko Arakawa ◽  
Ichiro Ueno ◽  
Hiroshi Kawamura
Keyword(s):  
Fluid Flow ◽  
Liquid Bridge ◽  
Thermocapillary Convection ◽  
Ambient Fluid

D152 Effect of ambient fluid flow on thermocapillary convection in liquid bridge

2005 ◽  
Vol 2005 (0) ◽  
pp. 167-168
Author(s):  
Masakazu HARASHIMA ◽  
Satoshi KAWAME ◽  
Hiroshi KAWAMURA
Keyword(s):  
Fluid Flow ◽  
Liquid Bridge ◽  
Thermocapillary Convection ◽  
Ambient Fluid

scholarly journals Combined numerical and experimental study of microstructure and permeability in porous granular media

Solid Earth ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 1079-1095 ◽  
Author(s):  
Philipp Eichheimer ◽  
Marcel Thielmann ◽  
Wakana Fujita ◽  
Gregor J. Golabek ◽  
Michihiko Nakamura ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Numerical Simulations ◽  
Granular Media ◽  
Large Scale ◽  
Earth Science ◽  
Effective Porosity ◽  
Flow Through Porous Media ◽  
Flow Properties ◽  
Wide Range ◽  
Flow Through

Abstract. Fluid flow on different scales is of interest for several Earth science disciplines like petrophysics, hydrogeology and volcanology. To parameterize fluid flow in large-scale numerical simulations (e.g. groundwater and volcanic systems), flow properties on the microscale need to be considered. For this purpose experimental and numerical investigations of flow through porous media over a wide range of porosities are necessary. In the present study we sinter glass bead media with various porosities and measure the permeability experimentally. The microstructure, namely effective porosity and effective specific surface, is investigated using image processing. We determine flow properties like tortuosity and permeability using numerical simulations. We test different parameterizations for isotropic low-porosity media on their potential to predict permeability by comparing their estimations to computed and experimentally measured values.

scholarly journals Planar column collapse of elongated grains

2021 ◽  
Vol 249 ◽  
pp. 06006
Author(s):  
Andrea Jara ◽  
Miguel Cabrera
Keyword(s):  
Granular Media ◽  
Grain Shape ◽  
Ambient Fluid ◽  
Horizontal Orientation ◽  
Column Collapse ◽  
Grain Orientations ◽  
Shape Effects ◽  
Relative Transition ◽  
Grain Properties ◽  
Submerged Conditions

The granular column collapse is a benchmark configuration for the study of granular flows in dry, saturated, and submerged conditions. The collapse sequence and resultant mobility is acknowledged to be controlled by the column aspect ratio, while grain properties define the relative transition of each stage. Grain shape effects are found to modify the global shear resistance of granular media, with a strong and coupled interaction when interacting with a fluid. In this work, we present the first steps towards the study of grain shape effects in a column collapse when interacting with an ambient fluid. For this purpose, we use a planar configuration and explore the collapse of a column consisting of rod-like grains and study the initial and after collapse grain orientations. On it, the mobilized grains deposit in a preferential horizontal orientation, but further experiments are required to confirm if a nematic configuration can be achieved.

scholarly journals Combined numerical and experimental study of microstructure and permeability in porous granular media

2020 ◽  
Author(s):  
Philipp Eichheimer ◽  
Marcel Thielmann ◽  
Wakana Fujita ◽  
Gregor J. Golabek ◽  
Michihiko Nakamura ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Numerical Simulations ◽  
Granular Media ◽  
Large Scale ◽  
Earth Science ◽  
Numerical Models ◽  
Effective Porosity ◽  
Flow Properties ◽  
Wide Range ◽  
Flow Through

<div> <div> <div> <p>Fluid flow on different scales is of interest for several Earth science disciplines like petrophysics, hydrogeology and volcanology. To parameterize fluid flow in large-scale numerical simulations (e.g. groundwater and volcanic systems), flow properties on the microscale need to be considered. For this purpose experimental and numerical investigations of flow through porous media over a wide range of porosities are necessary. In the present study we sinter glass bead media with various porosities, representing shallow depth crustal sediments. The microstructure, namely effective porosity and effective specific surface, is investigated using image processing. We furthermore determine flow properties like hydraulic tortuosity and permeability using both experimental measurements and numerical simulations. By fitting microstructural and flow properties to porosity, we obtain a modified Kozeny-Carman equation for isotropic low-porosity media, that can be used to simulate permeability in large-scale numerical models. To verify the modified Kozeny-Carman equation we compare it to the numerically computed and experimentally measured permeability values.</p> </div> </div> </div>

A Robotic Tool for Magnetic Micromanipulation of Cells in the Presence of an Ambient Fluid Flow

2019 ◽  
Author(s):  
Dharmveer Agarwal ◽  
Ajay D. Thakur ◽  
Atul Thakur
Keyword(s):  
Fluid Flow ◽  
Pulse Width Modulation ◽  
Ambient Fluid ◽  
Electromagnetic Coils ◽  
Planning Algorithm ◽  
On Chip ◽  
Automated Feedback ◽  
Robotic Tool ◽  
Proportional Controller

Abstract This paper reports an automated image-guided microrobotic tool to perform nonprehensile magnetic manipulation of large (of the order of few hundreds of microns) microscopic biological objects in the presence of an ambient fluid flow. The developed tool comprises of ferromagnetic microrobots actuated by electromagnetic coils arranged in a quadrupole configuration, a DC power source, and a pulse width modulation (PWM) based controller to vary the coil currents. In order to accomplish the stated objective of automated micromanipulation task, a two-tier approach is adopted, namely, (1) generation of a feedback planning algorithm that invokes one of the two motion maneuvers, namely, ‘arrest’ and ‘move’ and (2) development of a proportional controller that determines the currents to be passed through the coils based on the maneuver invoked so that the resultant magnetic field actuates the ferromagnetic microrobot in the desired direction. A physical experiment was conducted and reported to authenticate the validity of the developed approach. We believe that the developed tool can be used to perform automated feedback controlled micromanipulation of large biological cells and cell aggregates in the presence of an ambient fluid flow especially in in-vivo environments. The inherent biocompatibility of the microbot material provides a possibility to functionalize it with living cells and/or appropriate chemicals rendering it feasible to implement drug delivery and also perform on-chip biological experiments.

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