Fluid Dynamics - understanding fluid dynamics to improve our lives

通过预先填充的注射器或小瓶进行药物注射是给药或接种疫苗的普遍方法。制备这些注射器的自动化过程可能会在填充过程中引入有害颗粒。为了确保病人的安全，我们实施了严格的质量控制措施。检测这些粒子需要旋转注射器以诱导低浓度，然后突然停下来观察任何表明粒子存在的残余运动，类似于斯托克斯的第一个问题。最近对无限长圆柱体的研究提供了理想的模型。然而，现实世界的注射器有端壁，引入了额外的复杂性。该项目旨在数值研究旋转开始和停止期间的流动特性，特别是在光滑角速度剖面和有限圆柱场景下。通过解决这一相对新颖的问题，该项目旨在为加强注射安全规程建立必要的基础知识。

Drug injection via pre-filled syringes or vials is a prevalent method for administering medication or vaccines. The automated process of preparing these syringes can potentially introduce harmful particles during filling. To ensure patient safety, rigorous quality control measures are implemented. Detecting such particles involves rotating the syringes to induce low and then abruptly stopping to observe any residual motion indicating particle presence, akin to Stokes' first problem. Recent investigations focused on infinitely long cylinders provide idealised models. However, real-world syringes have end walls, introducing additional complexities. This project aims to numerically study flow characteristics during rotation initiation and cessation, particularly for smooth angular velocity profiles and finite cylinder scenarios. By addressing this relatively novel problem, the project seeks to establish foundational knowledge essential for enhancing injection safety protocols.