DYNAMIC SIMULATION OF FLEXIBLE FIBERS COMPOSED OF LINKED RIGID BODIES
DYNAMIC SIMULATION OF FLEXIBLE FIBERS COMPOSED OF LINKED RIGID BODIES
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DOI：
10.1063/1.473067
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发表时间：
1997-02
影响因子：
4.4
通讯作者：
R. Ross;D. Klingenberg
中科院分区：
文献类型：
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作者：
R. Ross;D. Klingenberg
采用粒子级模拟方法研究了刚性和柔性纤维悬浮液的流动动力学。纤维被建模为通过球窝关节连接的长球体链。通过改变接头中的阻力，可以对柔性和刚性纤维进行建模。包括纤维之间的排斥相互作用，但在该实施方式中忽略了流体动力学相互作用和粒子惯性。纤维的运动通过求解每个球体的平移和旋转运动方程来确定。对剪切流中孤立纤维的模拟表明，该方法可以再现刚性和柔性纤维的已知动力学行为。研究了简单剪切流动下悬浮液相对粘度的瞬态行为。刚性纤维的振荡响应与Ivanov等人的实验观察结果相似。光纤的柔性减小了振荡周期，但对稳态振荡的影响不大。
A particle-level simulation method is employed to study the dynamics of flowing suspensions of rigid and flexible fibers. Fibers are modeled as chains of prolate spheroids connected through ball and socket joints. By varying the resistance in the joints, both flexible and rigid fibers can be modeled. Repulsive interactions between fibers are included, but hydrodynamic interactions and particle inertia are neglected in this implementation. The motion of a fiber is determined by solving the translational and rotational equations of motion for each spheroid. Simulations of isolated fibers in shear flow demonstrate that the method can reproduce known dynamical behavior of both rigid and flexible fibers. The transient behavior in the suspension relative viscosity under simple shear flow was also investigated. An oscillatory response similar to the experimental observations of Ivanov et al. was obtained for rigid fibers. Fiber flexibility reduced the period of oscillation, but had little effect on steady-state ...