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 ($25\le Re\le 200$) and blockage ratio $\left(0.15\le k\le 0.40\right)$ 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 $Re$, while $k$ has little impact. The quasi frequency of such oscillation has almost no business with $Re$ and $k$. Moreover, $Re$ 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.

中文翻译：

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脉动速度驱动的泊肃叶流中的中性浮力粒子迁移


采用浸入边界格子玻尔兹曼法 (IB-LBM) 对脉动速度驱动的二维 (2D) 泊肃叶通道流中的中性浮力圆形粒子迁移进行了数值研究。的影响 $Re$ ynolds 数 ( 年龄比$（0.15\le k\le 0.40）$对脉动和非脉动速度驱动的粒子迁移的影响都进行了数值研究以进行比较。结果表明，与非脉动情况不同，在脉动情况下，粒子在零速度期间会以欠阻尼振荡的方式向通道中心线迁移。质点在一个周期运动周期中的最大横向移动距离将随着增大而增大$右e$ ， 尽管$k$影响不大。这种振荡的准频率几乎与$右e$和$k$ 。而且，$右e$对阻尼比起着至关重要的作用。脉动流场在主动脉和其他动脉中普遍存在。本文有助于了解纳米粒子在这些动脉中的迁移。