6 research outputs found
Dynamics of Fluid Vesicles in Oscillatory Shear Flow
The dynamics of fluid vesicles in oscillatory shear flow was studied using
differential equations of two variables: the Taylor deformation parameter and
inclination angle . In a steady shear flow with a low viscosity
of internal fluid, the vesicles exhibit steady tank-treading
motion with a constant inclination angle . In the oscillatory flow
with a low shear frequency, oscillates between or
around for zero or finite mean shear rate ,
respectively. As shear frequency increases, the vesicle
oscillation becomes delayed with respect to the shear oscillation, and the
oscillation amplitude decreases. At high with , another limit-cycle oscillation between and
is found to appear. In the steady flow, periodically rotates
(tumbling) at high , and and the vesicle shape
oscillate (swinging) at middle and high shear rate. In the
oscillatory flow, the coexistence of two or more limit-cycle oscillations can
occur for low in these phases. For the vesicle with a fixed shape,
the angle rotates back to the original position after an oscillation
period. However, it is found that a preferred angle can be induced by small
thermal fluctuations.Comment: 11 pages, 13 figure
Effect of tube diameter and capillary number on platelet margination and near-wall dynamics
The effect of tube diameter and capillary number on platelet
margination in blood flow at tube haematocrit is investigated.
The system is modelled as three-dimensional suspension of deformable red blood
cells and nearly rigid platelets using a combination of the lattice-Boltzmann,
immersed boundary and finite element methods. Results show that margination is
facilitated by a non-diffusive radial platelet transport. This effect is
important near the edge of the cell-free layer, but it is only observed for , when red blood cells are tank-treading rather than tumbling. It is also
shown that platelet trapping in the cell-free layer is reversible for . Only for the smallest investigated tube ()
margination is essentially independent of . Once platelets have reached the
cell-free layer, they tend to slide rather than tumble. The tumbling rate is
essentially independent of but increases with . Tumbling is suppressed
by the strong confinement due to the relatively small cell-free layer thickness
at tube haematocrit.Comment: 16 pages, 10 figure
Computational study of radial particle migration and stresslet distributions in particle-laden turbulent pipe flow
Particle-laden turbulent flows occur in a variety of industrial applications as well as in naturally occurring flows. While the numerical simulation of such flows has seen significant advances in recent years, it still remains a challenging problem. Many studies investigated the rheology of dense suspensions in laminar flows as well as the dynamics of point-particles in turbulence. Here we employ a fully-resolved numerical simulation based on a lattice Boltzmann scheme, to investigate turbulent flow with large neutrally buoyant particles in a pipe flow at low Reynolds number and in dilute regimes. The energy input is kept fixed resulting in a Reynolds number based on the friction velocity around 250. Two different particle radii were used giving a particle-pipe diameter ratio of 0.05 and 0.075. The number of particles is kept constant resulting in a volume fraction of 0.54% and 1.83%, respectively. We investigated Eulerian and Lagrangian statistics along with the stresslet exerted by the fluid on the spherical particles. It was observed that the high particle-to-fluid slip velocity close to the wall corresponds locally to events of high energy dissipation, which are not present in the single-phase flow. The migration of particles from the inner to the outer region of the pipe, the dependence of the stresslet on the particle radial positions and a proxy for the fragmentation rate of the particles computed using the stresslet have been investigated