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首页> 外文期刊>Physica, A. Statistical mechanics and its applications >Bubbles and solid structures in a vibrated bed of granular materials
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Bubbles and solid structures in a vibrated bed of granular materials

机译：颗粒物料振动床中的气泡和固体结构

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摘要

Modern graphics processing units (GPUs) are able to perform high-precision simulations for scientific applications. As a demonstration example, large-scale, three-dimensional computer simulations were performed on a single GPU to produce bubbles and solid structures in a tiny, annular container, partially filled with a granular material, shaken vertically. The dynamics of the gas above and within the shaken granular material was solved using large-eddy simulations (LES) while the grains were treated with molecular dynamics. A feature of the results is that bubbles form when peak acceleration relative to gravity exceeds a critical value Γb. This is in qualitative agreement with experiments [H.P. Pak, P.R. Behringer, Nature 371 (1994) 231]. An interesting finding is that Γbfor glass particles depends primarily on the coefficient of friction,μ, as well as on the coefficients which characterize the viscoelastic response of the granular material.
机译：现代图形处理单元（GPU）能够为科学应用执行高精度仿真。作为演示示例，在单个GPU上进行了大规模的三维计算机仿真，以在一个微小的环形容器中产生气泡和固体结构，该容器部分填充有颗粒状材料，并垂直摇动。使用大涡模拟（LES）解决了摇动的颗粒状物料上方和内部的气体动力学问题，同时对颗粒进行了分子动力学处理。结果的特征是，当相对于重力的峰值加速度超过临界值Γb时会形成气泡。这与实验[H.P. Pak，P.R。Behringer，自然371（1994）231]。一个有趣的发现是玻璃颗粒的Γb主要取决于摩擦系数μ，以及代表粒状材料粘弹性响应特征的系数。

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