Fluid Dynamics - understanding fluid dynamics to improve our lives

经由预填充注射器或小瓶的药物注射是用于施用药物或疫苗的普遍方法。制备这些注射器的自动化过程可能会在灌装过程中引入有害颗粒。为确保患者安全，我们实施了严格的质量控制措施。检测这种颗粒涉及旋转注射器以引起低，然后突然停止以观察指示颗粒存在的任何残余运动，类似于斯托克斯的第一个问题。最近的研究集中在无限长的圆柱体提供了理想化的模型。然而，现实世界的注射器具有端壁，这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过程中的流动特性，特别是对于光滑的角速度剖面和有限圆柱体的情况。通过解决这个相对较新的问题，该项目旨在建立基础知识，提高注射安全协议。

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.