胶体的回溯：多粒子碰撞动力学模拟研究
Backtracking of colloids: a multiparticle collision dynamics simulation study
摘要：
声音在中尺度系统动力学中的作用通常被忽略，因为相关的时间尺度通常比所有其他感兴趣的时间尺度小得多。然而，对于足够小的物体，以足够小的声速嵌入溶剂中，声音可以发挥至关重要的作用。特别是，类似粘弹性的行为已经在理论上预测为非粘弹性流体。这种效应是由于溶质粒子的运动和流体动力学涡旋的形成对声波的传播产生了干扰。我们证明了这种效果，称为回溯，在计算机模拟采用多粒子碰撞动力学的方法。系统地研究了声对溶质粒子动力学的影响，发现在长时间极限下，声对溶质粒子动力学的影响消失。因此，我们确认，在单粒子水平的声波效应可以忽略不计，在足够长的时间。
英文摘要：
The role of sound in the dynamics of mesoscale systems is typically neglected, since frequently the associated time scales are much smaller than all the other time scales of interest. However, for sufficiently small objects embedded in a solvent with a sufficiently small sound velocity, sound can play a crucial role. In particular, behavior resembling viscoelasticity has been theoretically predicted for non-viscoelastic fluids. This effect is due to the interference of the propagation of sound waves caused by the solute particle's motion and hydrodynamic vortex formation. We demonstrate this effect, known as backtracking, in computer simulations employing the method of multiparticle collision dynamics. We systematically study the influence of sound on the dynamics of the solute particle, and find that it disappears in the long-time limit. Thus, we confirm that sonic effects at the single-particle level can be neglected at sufficiently long times.
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