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  • 关于举办匹兹堡大学方雷助理教授学术讲座的通知

    发布时间:2022-01-06设置

    报告题目:拉格朗日相干结构附近活性非球形菌体的优先排列和非均匀分布

    Preferential alignment and heterogeneous distribution of active non-spherical swimmers near Lagrangian coherent structures

    报告时间:202217日星期五10:0011:00

    报告地点:腾讯会议 ID42265298356

    腾讯直播间:https://meeting.tencent.com/l/QALGLWoVMAcS

    报 告 人:方雷(美国匹兹堡大学,土木与环境工程系)

    方老师官方主页:http://www.leifang.pitt.edu/

    欢迎广大师生参加.

      

      

    土木与交通学院

    202216

      

      

    报告人简介:

    方雷博士目前是匹兹堡大学土木与环境工程系助理教授。方老师主要从事湍流动力学和湍流输送方面的研究,重点研究湍流动力学与生物、环境以及健康等相关主题的结合。方老师目前的研究兴趣包括活性非球形菌体的运输、生物激发的流体混合问题以及新流体实验方法的开发。加入匹兹堡大学之前,方老师于2020年春季在美国斯坦福大学土木与环境工程系获得博士学位,并辅修计算与数学工程博士学位。方老师的研究成果欢迎参见主页:http://www.leifang.pitt.edu/

    Lei Fang is an Assistant Professor in Civil and Environmental Engineering at the University of Pittsburgh. His research focuses on turbulence dynamics, and transport and mixing problems with particular emphasis on topics relevant to biology, environment, and health. Current interests include the transport of active non-spherical swimmers, biologically generated mixing, and the development of new experimental methods. Prior to joining the faculty at Pitt, he received a Ph.D. from Stanford University in the Civil and Environmental Engineering Department with a Ph.D. minor in Computational and Mathematical Engineering in Spring 2020. You are welcome to visit his researchat http://www.leifang.pitt.edu/.

      

    报告摘要:

    活性非球形菌体和动态流体环境之间的交互,在生物、环境和医疗发展进程中起到根本性作用。然而,流体和活性菌体之间通用的交互准则仍然缺失。我们提出了一种可在坚固的流体结构、拉格朗日相干结构(LCS)以及活性非球形菌体之间通用的交互准则。利用混合实验-数值模型,我们展现了中等固有速度的杆状游子与吸引性LCS之间存在强而稳定的优先排列,而这也将进一步导致明显的非均匀空间分布。相比之下,盘状、被动式以及快速游子表现出的优先性要弱得多。此外,我们展示了这种非均匀分布的自相似性,将复杂的相互作用归结为单独一个控制参数的影响。本团队的研究结果普遍性地阐明了活性和非球形菌体与LCS之间的交互作用,因此可以广泛应用于许多天然和工程流体。这项研究在今年新冠疫情大流行期间花费三个月进行,并完全依靠远程完成。

    The interaction between active non-spherical swimmers and dynamic fluid environments plays a fundamental role in biological, environmental, and medical processes. However, generic interaction rules between flow and active swimmers are still missing. Here, we propose a generic interaction rule between a robust flow structure, Lagrangian coherent structures (LCSs), and active non-spherical swimmers. Using a hybrid experimental-numerical model, we show that rod-like swimmers with intermediate intrinsic velocities have a strong and robust preferential alignment with attracting LCSs, which further leads to a strong heterogeneous spatial distribution. In contrast, disk-like swimmers, passive, and very fast swimmers show a much weaker preference. Moreover, we show the self-similarity of this heterogeneous distribution, which boils the intricate interaction down to only one control parameter.Our results generically elucidate the interaction between active and non-spherical swimmers with LCSs and, thus, can be widely applied to many natural and engineered fluids. This research is conducted over the course of three months during the pandemic this year and is done fully remotely.


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