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Research and Work
Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical analysis and data structures to analyze and solve problems that involve fluid flows. CFD is applied to a wide range of research and engineering problems in many fields of study and industries, and I have used CFD to study the dynamic characteristics of magnetically actuated particles, a kind of active colloid that find application in biology and microfluidics.
1. Magnetic Actuation of Surface Walkers: The Effects of Confinement and Inertia (2019 - 2020)
Driven by a magnetic field, the rotation of a particle near a wall can be rectified into a net translation. Here, we investigate the motion of spherical surface walkers confined between two walls using simulations based on the immersed-boundary lattice Boltzmann method. The degree of confinement and the nature of the confining walls (slip vs no-slip) significantly affect a particle’s translational speed and can even reverse its translational direction.
2. A Systematic Confinement Study of Particle Actuation by Rotating Magnetic Fields in Microchannels (2020 - 2021)
The actuation of magnetic particles confined in microchannels is not yet well understood. Here, the actuation of a ferromagnetic particle confined in square microchannels is studied using immersed boundary lattice Boltzmann simulations. These phenomena are elucidated by studying the flow and pressure fields in the channel-particle system and by analyzing the viscous and pressure components of the hydrodynamic force acting on different parts of the sphere.
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