Jabbarzadeh Mehdi, Hyon YunKyong, Fu Henry C
Department of Mechanical Engineering, University of Nevada at Reno, Reno, Nevada 89557 USA.
Division of Computational Sciences in Mathematics, National Institute for Mathematical Sciences, Daejeon, Republic of Korea 305-811.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Oct;90(4):043021. doi: 10.1103/PhysRevE.90.043021. Epub 2014 Oct 31.
Swimming microorganisms in biological complex fluids may be greatly influenced by heterogeneous media and microstructure with length scales comparable to the organisms. A fundamental effect of swimming in a heterogeneous rather than homogeneous medium is that variations in local environments lead to swimming velocity fluctuations. Here we examine long-range hydrodynamic contributions to these fluctuations using a Najafi-Golestanian swimmer near spherical and filamentous obstacles. We find that forces on microstructures determine changes in swimming speed. For macroscopically isotropic networks, we also show how the variance of the fluctuations in swimming speeds are related to density and orientational correlations in the medium.
生物复杂流体中的游动微生物可能会受到与生物体长度尺度相当的非均匀介质和微观结构的极大影响。在非均匀而非均匀介质中游泳的一个基本效应是，局部环境的变化会导致游泳速度波动。在这里，我们使用一个靠近球形和丝状障碍物的纳贾菲-戈莱斯坦尼游动体，研究这些波动的长程流体动力学贡献。我们发现，微观结构上的力决定了游泳速度的变化。对于宏观各向同性网络，我们还展示了游泳速度波动的方差如何与介质中的密度和取向相关性相关。
