重力场内流体-纤维流固耦合分析
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苏州大学机电工程学院

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O347.1

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Fluid-fiber fluid-structure interaction analysis in gravity field
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School of Mechanical and Electric Engineering,Soochow University

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    摘要:

    为了研究计及重力场的流体与柔性体耦合的动力行为,探究其动力学内在规律,本文基于格子玻尔兹曼方法(Lattice Boltzmann Method,LBM)、浸入边界法(Immersed Boundary Method,IBM)和动量交换原理(Momentum Exchange,ME)结合的ME-IBM-LBM理论,采用有限差分法(Finite Difference Method,FDM)对二维空间里受重力场影响的单根柔性纤维在均匀流场中的运动特性进行了数值模拟,探究了不同流体速度(U0)、纤维长度(Lx)和线密度(M)下单根柔性纤维在多场耦合作用下的动态响应。研究结果表明,在一定的U0、Lx、M条件下,一端固定柔性纤维运动在多场耦合作用下有稳态与非稳态两种基本运动形式,与实际情况相符。根据模拟数据分析,发现纤维可在以下三种多场耦合模型中呈现稳态运动:(1) 若U0=0.02、Lx=30,M应小于0.2;(2)若M=0.25、U0=0.02,Lx应小于26;(3)若M=0.3、Lx=36,U0应大于0.06。

    Abstract:

    In order to study the dynamic behaviors of the fluid coupled with the flexible body within gravity field, numerical simulation of the motion characteristics of single flexible fiber in a two-dimensional space affected by the gravity field and uniform flow field based on the finite difference method (FDM) combined with the lattice Boltzmann method (LBM), immersed boundary method (IBM) and ME (Momentum Exchange) has been implemented. Especially, the dynamic response of single flexible fiber with one end fixed and different lengths under different fluid inlet speeds and fiber densities under multiple fields has been investigated. Results show that the flexible fiber with one end fixed can reach the two basic motion, i. e., steady state motion and unsteady state motion, which is in the condition of multi-field coupling and certain U0, Lx, M, this is consistent with the actual situation. According to the simulation results, it is found that fiber reaches steady state motion in the following three multi-field coupling models: (1) U0=0.02、Lx=30, M is less than 0.2; (2) M=0.25、U0=0.02, Lx is less than 26; and (3) M=0.3、Lx=36, U0 is greater than 0.06 .

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赵冉,冯志华,钱晨. 重力场内流体-纤维流固耦合分析[J]. 科学技术与工程, 2019, 19(15): 12-19.
ZHAO Ran,,QIAN Chen. Fluid-fiber fluid-structure interaction analysis in gravity field[J]. Science Technology and Engineering,2019,19(15):12-19.

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  • 收稿日期:2018-12-22
  • 最后修改日期:2019-03-27
  • 录用日期:2019-02-26
  • 在线发布日期: 2019-06-10
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