沙泳蜥蜴;沙鱼
Sand swimming lizard: sandfish
摘要：
我们使用高速X射线成像来揭示一种小型（~ 10厘米）沙漠蜥蜴，沙鱼（Scincus scincus），如何在颗粒介质中游泳[1]。在水面上，蜥蜴使用标准的对角步态，但一旦在水面以下，生物体就不再使用四肢推进。相反，它传播一个大振幅的单周期正弦行波下来的身体和尾巴，以推动自己的速度高达1.5体长/秒。出于这些实验，我们研究了数值模型的沙鱼，因为它在一个有效的软球分子动力学颗粒介质模拟游泳。我们使用这个模型作为一种工具，以了解动态，如流场和力量产生的动物游泳内的颗粒介质。[1]马拉登，R. D和Ding，Y.和Li，C.和戈德曼，D.I.，《沙中的波动游泳：沙鱼的水下运动》，科学，325，314，2009
英文摘要：
We use high-speed x-ray imaging to reveal how a small (~10cm) desert dwelling lizard, the sandfish (Scincus scincus), swims within a granular medium [1]. On the surface, the lizard uses a standard diagonal gait, but once below the surface, the organism no longer uses limbs for propulsion. Instead it propagates a large amplitude single period sinusoidal traveling wave down its body and tail to propel itself at speeds up to ~1.5 body-length/sec. Motivated by these experiments we study a numerical model of the sandfish as it swims within a validated soft sphere Molecular Dynamics granular media simulation. We use this model as a tool to understand dynamics like flow fields and forces generated as the animal swims within the granular media. [1] Maladen, R.D. and Ding, Y. and Li, C. and Goldman, D.I., Undulatory Swimming in Sand: Subsurface Locomotion of the Sandfish Lizard, Science, 325, 314, 2009
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