| 非球形颗粒布朗运动的涨落-格子Boltzmann数值研究 |
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| 引用本文： | 聂德明,林建忠.非球形颗粒布朗运动的涨落-格子Boltzmann数值研究[J].计算物理,2012,29(1):101-107. |
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| 作者姓名： | 聂德明 林建忠 |
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| 作者单位： | 中国计量学院计量测试工程学院, 杭州 310018 |
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| 基金项目： | 国家自然科学基金重点项目 |
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| 摘 要： | 采用涨落-格子Boltzmann方法对非球形颗粒(二维)的布朗运动进行直接数值模拟.数值结果包括椭圆形、矩形颗粒的速度均方值及速度自相关函数等.研究发现,对于非球形颗粒,其方向性并没有影响能量均分原理的适用性,每个自由度的能量由其速度或角速度的均方值确定,而且计算的颗粒平动温度和转动温度一致.此外,颗粒的速度自相关函数在相对长的时间内以~ct-1的规律衰减,其系数c与颗粒的形状无关.
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| 关 键 词： | 布朗运动 涨落-格子Boltzmann方法 非球形颗粒 |
| 收稿时间： | 2011-04-11 |
| 修稿时间： | 2011-07-27 |
Brownian Motion of Non-spherical Particles: FluctuatingLattice Boltzmann Investigation |
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| NIE Deming
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LIN Jianzhong.Brownian Motion of Non-spherical Particles: FluctuatingLattice Boltzmann Investigation[J].Chinese Journal of Computational Physics,2012,29(1):101-107. |
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| Authors: | NIE Deming LIN Jianzhong |
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| Institution: | College of Metrology and Technology Engineering, China Jiliang University, Hangzhou 310018, China |
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| Abstract: | A fluctuating-lattice Boltzmann method is used for direct numerical simulations of Brownian motion of non-spherical particles.Numerical results include mean-square velocities and velocity autocorrelation functions of elliptical and rectangular particles.It showns that equi-partition theorem applies to non-spherical particles as well and energy of each degree of freedom depends on corresponding mean-square velocity or rotational velocity.Furthermore,translational temperature of Brownian particle is identical to its rotational temperature.Finally,velocity autocorrelation function of Brownian particle decays at relative long times as ~ct-1,where coefficient c is independent of particle shape. |
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| Keywords: | Brownian motion fluctuating lattice Boltzmann method non-spherical particle |
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