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Modelling inelastic Granular Media Using Dynamical Density Functional Theory
Journal of Statistical Physics ( IF 1.6 ) Pub Date : 2021-03-27 , DOI: 10.1007/s10955-020-02675-0
B. D. Goddard , T. D. Hurst , R. Ocone

We construct a new mesoscopic model for granular media using Dynamical Density Functional Theory (DDFT). The model includes both a collision operator to incorporate inelasticity and the Helmholtz free energy functional to account for external potentials, interparticle interactions and volume exclusion. We use statistical data from event-driven microscopic simulations to determine the parameters not given analytically by the closure relations used to derive the DDFT. We numerically demonstrate the crucial effects of each term and approximations in the DDFT, and the importance of including an accurately parametrised pair correlation function.



中文翻译:

使用动态密度泛函理论对非弹性颗粒介质进行建模

我们使用动态密度泛函理论(DDFT)为颗粒介质构造了一个新的介观模型。该模型既包括碰撞操作员(用于合并非弹性),又包括亥姆霍兹自由能函数(用于考虑外部电势,粒子间的相互作用和体积排阻)。我们使用事件驱动的微观模拟中的统计数据来确定未通过用于得出DDFT的闭合关系来解析给出的参数。我们用数值方法论证了DDFT中每个项和近似值的关键作用,以及包括精确参数对对函数的重要性。

更新日期:2021-03-27
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