Low-Reynolds-number swimming in viscous two-phase fluids

2012 ◽  
Vol 85 (3) ◽  
Author(s):  
Jian Du ◽  
James P. Keener ◽  
Robert D. Guy ◽  
Aaron L. Fogelson
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Two Phase ◽  
Low Reynolds Number Swimming ◽  
Low Reynolds

scholarly journals Low-Reynolds-number swimming at pycnoclines

2012 ◽  
Vol 109 (10) ◽  
pp. 3856-3861 ◽  
Author(s):  
A. Doostmohammadi ◽  
R. Stocker ◽  
A. M. Ardekani
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Low Reynolds Number Swimming ◽  
Low Reynolds

Optimal motion control of three-sphere based low-Reynolds number swimming microrobot

Robotica ◽  
2021 ◽  
pp. 1-17
Author(s):  
Hossein Nejat Pishkenari ◽  
Matin Mohebalhojeh
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Optimal Controller ◽  
Optimal Motion ◽  
Low Reynolds Number Flow ◽  
Reynolds Number Flow ◽  
Three Sphere ◽  
Low Reynolds Number Swimming ◽  
Number Flow ◽  
Low Reynolds

Abstract Microrobots with their promising applications are attracting a lot of attention currently. A microrobot with a triangular mechanism was previously proposed by scientists to overcome the motion limitations in a low-Reynolds number flow; however, the control of this swimmer for performing desired manoeuvres has not been studied yet. Here, we have proposed some strategies for controlling its position. Considering the constraints on arm lengths, we proposed an optimal controller based on quadratic programming. The simulation results demonstrate that the proposed optimal controller can steer the microrobot along the desired trajectory as well as minimize fluctuations of the actuators length.

A Finite Element Study of Low Reynolds Number Two-Phase Flow in Cylindrical Tubes

1985 ◽  
Vol 52 (2) ◽  
pp. 253-256 ◽  
Author(s):  
E. I. Shen ◽  
K. S. Udell
Keyword(s):  
Reynolds Number ◽  
Finite Element ◽  
Low Reynolds Number ◽  
Cell Movement ◽  
Cylindrical Tube ◽  
Two Phase ◽  
Bubble Liquid ◽  
Cylindrical Tubes ◽  
Low Reynolds ◽  
Steady State Problem

A finite element solution to the steady-state problem of an inviscid bubble flowing at low Reynolds number in a cylindrical tube occupied by a second viscous phase was obtained. Interfacial tension forces were balanced against the viscous and pressure forces in order to locate the position of bubble-liquid interface. Velocities, pressures, and film thicknesses were obtained as a function of the capillary number. Specific applications of these results include the description of multiphase flow in tubes and porous media, and blood cell movement in small capillaries. The numerical results are compared with published theories and experiments.

LOW REYNOLDS NUMBER SWIMMING IN TWO DIMENSIONS

2000 ◽  
Author(s):  
ALEXANDRE CHERMAN ◽  
JOAQUíN DELGADO ◽  
FERNANDO DUDA ◽  
KURT EHLERS ◽  
JAIR KOILLER ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Low Reynolds Number ◽  
Two Dimensions ◽  
Low Reynolds Number Swimming ◽  
Low Reynolds

scholarly journals A two-dimensional model of low-Reynolds number swimming beneath a free surface

2011 ◽  
Vol 681 ◽  
pp. 24-47 ◽  
Author(s):  
DARREN CROWDY ◽  
SUNGYON LEE ◽  
OPHIR SAMSON ◽  
ERIC LAUGA ◽  
A. E. HOSOI
Keyword(s):  
Reynolds Number ◽  
Free Surface ◽  
Low Reynolds Number ◽  
Two Dimensional ◽  
Soft Interfaces ◽  
Low Reynolds Number Swimming ◽  
Variable Approach ◽  
Hydrodynamic Coupling ◽  
Low Reynolds ◽  
Mapping Techniques

Biological organisms swimming at low-Reynolds number are often influenced by the presence of rigid boundaries and soft interfaces. In this paper, we present an analysis of locomotion near a free surface with surface tension. Using a simplified two-dimensional singularity model and combining a complex variable approach with conformal mapping techniques, we demonstrate that the deformation of a free surface can be harnessed to produce steady locomotion parallel to the interface. The crucial physical ingredient lies in the nonlinear hydrodynamic coupling between the disturbance flow created by the swimmer and the free boundary problem at the fluid surface.

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