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Unsteady swimming of small organisms
Abstract Small planktonic organisms ubiquitously display unsteady or impulsive motion to attack a prey or escape a predator in natural environments. Despite this, the role of unsteady forces such as…
Stratlets: low Reynolds number point-force solutions in a stratified fluid.
It is shown that Stratification dramatically alters the flow by creating toroidal eddies, and velocity decays much faster than in a homogeneous fluid, which can affect the swimming of small organisms and the sinking of marine snow particles, and diminish the effectiveness of mechanosensing in the ocean.
Dynamics of bead formation, filament thinning and breakup in weakly viscoelastic jets
- A. Ardekani, Vandana Sharma, G. McKinley
- Engineering, PhysicsJournal of Fluid Mechanics
- 6 December 2010
The spatiotemporal evolution of a viscoelastic jet depends on the relative magnitude of capillary, viscous, inertial and elastic stresses. The interplay of capillary and elastic stresses leads to the…
Numerical investigation of particle–particle and particle–wall collisions in a viscous fluid
The dynamics of particle–particle collisions and the bouncing motion of a particle colliding with a wall in a viscous fluid is numerically investigated. The dependence of the effective coefficient of…
- A. Ardekani
- Physics, Engineering
Paramecium swimming in capillary tube Phys. Fluids 24, 041901 (2012) Orientational order in concentrated suspensions of spherical microswimmers Phys. Fluids 23, 111702 (2011) Microfluidic droplet…
Undulatory swimming in non-Newtonian fluids
We numerically investigate the effects of non-Newtonian fluid properties, including shear thinning and elasticity, on the locomotion of Taylor’s swimming sheet with arbitrary amplitude. Our results…
Unsteady motion of two solid spheres in Stokes flow
This study is concerned with the unsteady motion of two solid spherical particles in an unbounded incompressible Newtonian flow. The background flow is uniform and can be time dependent. In addition,…
Hydrodynamic mechanisms of cell and particle trapping in microfluidics.
An overview of the cell/particle sorting techniques by harnessing intrinsic hydrodynamic effects in microchannels with emphasis on the underlying fluid dynamical mechanisms causing cross stream migration of objects in shear and vortical flows is presented.
Hydrodynamic interaction of microswimmers near a wall.
- Gaojin Li, A. Ardekani
- Physics, Environmental SciencePhysical review. E, Statistical, nonlinear, and…
- 15 July 2014
The hydrodynamics of an archetypal low-Reynolds number swimmer, called "squirmer," near a wall has been numerically studied and the role of inertial effects on the near-wall motion of the squirmer is quantified.