Gregory J. Sheard

  • Citations Per Year
Learn More
The shear rate dependence of platelet aggregation geometries is investigated using a combination of in vitro and numerical experiments. Changes in upstream shear rate, γPw, are found to cause systematic changes in mature platelet aggregation geometries. However, γPw is not the only factor determining the shear rate experienced by a platelet moving over, and(More)
Control systems for lab on chip devices require careful characterisation and design for optimal performance. Traditionally, this involves either extremely computationally expensive simulations or lengthy iteration of laboratory experiments, prototype design, and manufacture. In this paper, an efficient control simulation technique, valid for typical(More)
For shallow flow past an obstacle in a channel, the channel depth and blockage ratio play a significant role in the dynamics of the wake. In this study, the flow past a confined circular cylinder is investigated numerically using a spectral element algorithm. The incompressible Navier-Stokes equations are solved over a two dimensional domain, and a linear(More)
Microcirculation involves the smallest blood vessels which are responsible in blood flow regulation and oxygen transport. Microcirculation is very susceptible to diseases such as diabetes mellitus and sickle cell anemia. The membrane of red blood cells exposed to such diseases is known to be stiffer than the membrane of healthy red blood cells. The aim of(More)
The flow of blood past an axisymmetric thrombus analogue, within an in vitro geometry, is computed via solution of the discrete three-dimensional (3D) Navier–Stokes equations. Particle tracking is used to model the behaviour of thrombocytes (platelets) moving throughout the domain and to investigate behaviour with respect to the platelets. The system is(More)
The path to turbulence in the wake of cylinders with square crosssection is investigated by means of direct numerical simulation, employing a two-dimensional spectral element method and Floquet linear stability analysis. The critical Reynolds number for the onset of the three-dimensional instability modes A, B, C and QP are reported for cylinder incidence(More)
To date, several investigations have considered the prospect of enhanced dissipation of a vortex pair due to elliptic (short wave) instabilities. Recent studies indicate that these modes have the potential to significantly reduce the time taken to dissipate vortex pairs. This has generated interest in the aviation industry, where aircraft trailing wakes(More)
  • 1