【摘要】 气溶胶动力学方程是描述气溶胶动力学变化的主要方程,凝并与沉降共存问题是相关领域的常见的问题。建立了对该类问题的分段算法和直接蒙特卡罗模拟(Direct Simulation Monte Carlo method,DSMC)计算方法,对DSMC中事件后系统参数的更新方法进行了改进,并提出了用纳入解析解的分段算法的结果对DSMC模拟结果进行验证的方法。结果表明,改进的DSMC算法显著提高了计算效率,模拟结果与其它算法的结果一致。更多还原

【Abstract】 The Direct Simulation Monte Carlo method(DSMC) is one of the popular numerical simulation methods for solving the General Dynamic Equation(GDE),a description of aerosol dynamics.Coagulation and Settling are usually the most important mechanisms in the GDE. A modified DSMC for simulation of simultaneous coagulation and settling is proposed to save the computation time.Its evaluation method based on the sectional method and self-preserved distribution is proposed in this paper.The results of simulations show that the time consumption of the DSMC method could be reduced by a factor of 100 and 1000 while running 1000 and 10000 particles respectively.And the results of the DSMC method are consistent with those of the sectional method.更多还原