Understanding the dynamics of micro-organisms will help in developing artificial swimmers for applications like drug delivery. In the present study, a two-dimensional one-hinge swimmer resembling a scallop in Newtonian fluid is explored. To model the one-hinge swimmer, we use bead-spring model and the fluid is simulated using multi-particle collision dynamics with Anderson thermostat. We consider a non-uniform distribution of the bending rigidity along the arms of the swimmer, where we reduce the bending rigidity progressively from the hinge to the end of the arms. The non-uniform arms show higher swimming speed for the same average bending rigidity, thereby enhancing the efficiency of the swimmer. It was observed that the bending rigidity variation along the arm of the swimmer following a geometric sequence was more efficient than linear or quadratic for the same average bending rigidity. We also study the maneuverability of the one-hinge swimmer having asymmetrical bending rigidity for the arms, thereby the swimmer undergoes curved path. We find that depending upon the stiffness of the arm, the swimmer undergoes clockwise or anticlockwise rotation. We also find that the angular and transnational velocities of the swimmer are maximum at approximately the same sperm number $\sim 1.8$. The angular velocity of the swimmer scaled linearly with the amplitude of actuation as predicted by resistive force theory. Finally, we show that in the case of a two-dimensional one-hinge swimmer angular velocity, curvature and the direction of rotation can be controlled by just changing the relative bending rigidity of the arms.

中文翻译：

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提高单铰链游泳者的效率和机动性

了解微生物的动力学将有助于开发用于药物输送等应用的人工游泳者。在本研究中，探索了一种类似于牛顿流体中扇贝的二维单铰链游泳者。为了模拟单铰链游泳者，我们使用珠弹簧模型，并使用多粒子碰撞动力学和安德森恒温器模拟流体。我们考虑了沿着游泳者手臂的弯曲刚度的非均匀分布，我们从铰链到手臂末端逐渐降低弯曲刚度。在相同的平均弯曲刚度下，非均匀臂表现出更高的游泳速度，从而提高游泳者的效率。观察到，对于相同的平均弯曲刚度，沿着游泳者手臂的弯曲刚度变化遵循几何序列比线性或二次方程更有效。我们还研究了具有不对称手臂弯曲刚度的单铰链游泳者的机动性，从而使游泳者经历弯曲路径。我们发现，根据手臂的刚度，游泳者会顺时针或逆时针旋转。我们还发现游泳者的角速度和跨国速度在大约相同的精子数量时最大 游泳者进行顺时针或逆时针旋转。我们还发现游泳者的角速度和跨国速度在大约相同的精子数量时最大 游泳者进行顺时针或逆时针旋转。我们还发现游泳者的角速度和跨国速度在大约相同的精子数量时最大$～1.8$. 正如阻力理论所预测的那样，游泳者的角速度与致动幅度成线性比例。最后，我们表明，在二维单铰链游泳者角速度的情况下，可以通过改变手臂的相对弯曲刚度来控制曲率和旋转方向。