Neutrally Buoyant Particle Migration in Poiseuille Flow Driven by Pulsatile Velocity

A neutrally buoyant circular particle migration in two-dimensional (2D) Poiseuille channel flow driven by pulsatile velocity is numerical studied by using immersed boundary-lattice Boltzmann method (IB-LBM). The effects of Reynolds number ([Formula: see text]) and blockage ratio [Formula: see text] on particle migration driven by pulsatile and non-pulsatile velocity are all numerically investigated for comparison. The results show that, different from non-pulsatile cases, the particle will migrate back to channel centerline with underdamped oscillation during the time period with zero-velocity in pulsatile cases. The maximum lateral travel distance of the particle in one cycle of periodic motion will increase with increasing [Formula: see text] , while [Formula: see text] has little impact. The quasi frequency of such oscillation has almost no business with [Formula: see text] and [Formula: see text]. Moreover, [Formula: see text] plays an essential role in the damping ratio. Pulsatile flow field is ubiquitous in aorta and other arteries. This article is conducive to understanding nanoparticle migration in those arteries.