论文标题
中级雷诺数的简单相互模型游泳运动员的运动学
Kinematics of a simple reciprocal model swimmer at intermediate Reynolds numbers
论文作者
论文摘要
我们通过计算简单模型相互游泳者（非对称哑铃）的运动学作为雷诺数数字（RE）的函数，并研究了惯性的发作和逐渐增加如何影响游泳行为：游泳，流动方向和泳阵的反向。我们将游泳行程分为两个球体的膨胀和压缩，并将它们与权力和恢复中风联系起来。我们发现，沿游泳方向的开关也对应于功率和恢复中风的开关。我们通过在电力法相对于RE，游泳者的幅度以及两个球之间的距离下的膨胀和压缩过程中的净位移来获得平均游泳速度的表达。分析流体流动时，我们看到膨胀过程中的平均流场总是类似于推动器，并且压缩总是一个拉动器，但是当在整个周期中平均时，占主导地位的流是在动力行程中发生的流动。我们还将功率和恢复性中风与在扩展和压缩时期的游泳效率联系起来，我们发现动力冲程令人惊讶的是，并不总是比恢复中风更有效。我们的结果可能对生物学和最终人造游泳者的设计具有重要意义。
We computationally study the kinematics of a simple model reciprocal swimmer (asymmetric dumbbell) as a function of the Reynolds number (Re) and investigate how the onset and gradual increase of inertia impacts the swimming behavior: a reversal in the swim direction, flow directions, and the swim stroke. We divide the swim stroke into the expansion and compression of the two spheres and relate them to power and recovery strokes. We find that the switch in swim direction also corresponds to a switch in power and recovery strokes. We obtain expressions for the mean swimming velocity by collapsing the net displacement during expansion and compression under power law relationships with respect to Re, the swimmer's amplitude, and the distance between the two spheres. Analyzing the fluid flows, we see the averaged flow field during expansion always resembles a pusher and compression always a puller, but when averaged over the whole cycle, the flow that dominates is the one that occurs during the power stroke. We also relate the power and recovery strokes to the swimming efficiency during times of expansion and compression, and we find that the power stroke is, surprisingly, not always more efficient than the recovery stroke. Our results may have important implications for biology and ultimately the design of artificial swimmers.
