School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran.
Eur Phys J E Soft Matter. 2023 Mar 16;46(3):15. doi: 10.1140/epje/s10189-023-00273-y.
In the realm of low Reynolds number, the shape-changing biological and artificial matters need to break time reversibility in the course of their strokes to achieve motility. This necessity is well described in the so-called scallop theorem. In this work, considering low Reynolds number, a novel and versatile swimmer is proposed as an example of a new scheme to break time reversibility kinematically and, in turn, produce net motion. The swimmer consists of one sphere as a cargo or carried body, joined by one activated link with time-varying length, to another perpendicular rigid link, as the support of two passively flapping disks, at its end. The disks are free to rotate between their fixed minimum and maximum angles. The system's motion in two dimensions is simulated, and the maneuverability of the swimmer is discussed. The minimal operating parameters for steering of the swimmer are studied, and the limits of the swimmer are identified. The introduced swimming mechanism can be employed as a simple model system for biological living matters as well as artificial microswimmers.
在低雷诺数领域，形状变化的生物和人工物质在其运动过程中需要打破时间可逆性才能实现运动。这种必要性在所谓的扇贝定理中得到了很好的描述。在这项工作中，考虑到低雷诺数，提出了一种新颖且通用的游泳者作为打破时间可逆性运动的新方案的示例，并产生净运动。游泳者由一个球体作为货物或载体组成，通过一个随时间变化长度的激活链接与另一个垂直刚性链接连接，作为两个被动拍打圆盘的支撑，在其末端。圆盘可以在其固定的最小和最大角度之间自由旋转。模拟了系统在二维空间中的运动，并讨论了游泳者的机动性。研究了转向游泳者的最小操作参数，并确定了游泳者的限制。引入的游泳机制可用作生物活体以及人工微游泳者的简单模型系统。
