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| Dynamic analysis of two settling particles in a channel |
| Received:September 11, 2015 Revised:November 18, 2015 |
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| DOI：10.7511/jslx201606015 |
| KeyWord:particle sedimentation dynamic analysis lattice Boltzmann method fictitious domain scheme |
| Author | Institution |
| 陈荣前 |
中国计量学院 计量测试工程学院, 杭州 |
| 聂德明 |
中国计量学院 计量测试工程学院, 杭州 |
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| Abstract: |
| The lattice Boltzmann-direct forcing/fictitious method has been used to simulate the sedimentation of two particles in a channel for the Reynolds number of 50≤Re≤200.First of all,it has been shown that the two particles eventually sedimenting at 1/4 and 3/4 of channel width,respectively,irrespective of initial particle distance,Reynolds numbers and channel width.Secondly,the lateral forces (perpendicular to gravity) experienced by the particles are examined in detail.It has been found that the frequency of the lateral forces increases quadratically with increased Reynolds number.Furthermore,the frequency of single-particle system is always smaller than that of two-particle system.The significant power-law relationship between the frequency and the channel width has also been found through numerical simulations.The power-law exponent depends on the Reynolds number.The larger the Reynolds number is,the smaller the absolute value of the exponent is.Moreover,the influence of the Reynolds number and channel width on the amplitude of the lateral forces is also studied in this work. |
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