Symbolic computation of the phoretic acceleration of convex particles suspended in a non-uniform gas

Abstract A package has been developed for calculating analytic expressions for forces and torques onto an arbitrarily shaped convex tracer (aerosol) particle small compared to the mean free path of the surrounding nonequilibrium gas. The package Phoretic allows to compute analytical (and also numerical) expressions for forces and torques stemming from elastic and diffusive scattering processes parameterized by an accommodation coefficient. The method is based on calculating half-sphere integral tensor... Title of program: PHORETIC Catalogue Id: ADYI_v1_0 Nature of problem Starting from a non-uniform velocity distribution function of a gas in terms of its moments, i.e., field variables, and field gradients such as temperature, pressure, or velocity field, the problem is to analytically calculate forces and torques acting onto arbitrarly shaped convex tracer (aerosol) particles small in size compared to the mean free path of the gas. The collision process is modeled as a superposition of elastic and diffusive scattering processes (parameterized by 0 ≤ α ≤ 1). Versions of this program held in the CPC repository in Mendeley Data ADYI_v1_0; PHORETIC; 10.1016/j.cpc.2006.06.012 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)摘要 本工具包已开发完成，用于针对尺寸小于周围非平衡气体平均自由程的任意形状凸示踪（气溶胶）粒子，解析计算其所受的作用力与力矩。名为PHORETIC的工具包可计算由弹性与漫散射过程（由适配系数(accommodation coefficient)参数化）所产生的作用力与力矩的解析（亦可兼作数值）表达式。该方法基于半球积分张量的计算…… 程序名称：PHORETIC 目录编号：ADYI_v1_0 问题本质 本问题以气体的非均匀速度分布函数（以其矩，即场变量，以及温度、压强或速度场等场梯度为参数）为出发点，旨在解析计算尺寸小于气体平均自由程的任意形状凸示踪（气溶胶）粒子所受的作用力与力矩。碰撞过程被建模为以0 ≤ α ≤ 1为参数的弹性与漫散射过程的叠加。 《计算机物理学报》(Computer Physics Communications, CPC) Mendeley数据仓储中收录的本程序版本：ADYI_v1_0；PHORETIC；10.1016/j.cpc.2006.06.012 本程序源自贝尔法斯特女王大学维护的CPC程序库（1969-2019）