Lattice Boltzmann simulations of a dumbbell moving in a Poiseuille flow |
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Authors: | Yi Hou-Hui Chen Yan-Yan and Li Hua-Bing |
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Institution: | Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;Graduate School of the Chinese Academy of Sciences,Beijing 100080, China; .Department of Information Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;. |
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Abstract: | In this paper, the lattice Boltzmann method is applied to simulate a
dumbbell moving in a pressure-driven flow in a planar channel with
the stress-integration method for the evaluation of hydrodynamic
force acting on the cylinders. The simulation results show that the
dumbbell also has the important feature of the Segr\'e--Silberberg
effect like a particle in a Poiseuille flow. The dumbbell
trajectories, orientations, the cylinders vertical velocities and
angular velocities all reach their equilibrium values separately
independent of their initial positions. It is also found that the
dumbbell equilibrium positions depend on the flow Reynolds number,
blockage ratio and elastic coefficient. This study is expected to be
helpful to understand the dynamics of polymer solutions, polymer
synthesis and reaction, etc. |
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Keywords: | lattice
Boltzmann method dumbbell |
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