pm2.5的计算应该采用什么模型？
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我查阅了很多文献，发现最常用的还是加一个浓度输运方程。但是老板说pm2.5在不同粒径下有不同的物理学表象，在低粒径下存在范德华力以及不同粒径的转换，在高粒径下有沉积效应，这个是不是没法用拉格朗日方法进行模拟了？
你查的是哪些文献我看看。如果添加浓度传输方程这个毫无挑战性。
我查了一些文献，类似PM2.5这种颗粒属于fine particles，会存在free transport，以及对流。并且会存在聚并行为。下面这个文章是咱们国学者提出的TEMOM用来求解布朗运动导致粒子聚并行为并自由传输的过程。
A New Moment Method for Solving the Coagulation Equation for Particles in Brownian Motion
我觉得你说得对，就像你帖子主题一样，重要的是先搞清楚
pm2.5的计算应该采用什么模型？，然后才能算。单纯玩扩散模型上简化的太多了。 -
Asymptotic behavior of TEMOM model for particle population balance equation over the entire particle size regimes
看这篇文章开头：
Aerosol particles are increasingly recognized as one of the most common unhealthy components of air pollution
(Davidson et al., 2005). The evolution of particles coagulation is controlled by the particle population balance equation
(PBE), which is a nonlinear partial differential equation (Friedlander, 2000). The PBE is capable of describing the particle
evolution undergoing coagulation, aggregation (coalescence) and fragmentation (breakage) processes, etc.中间：
Since particles in the
range between 10 nm and 1000 nm stick together as a result of van der Waals forces when once collided, the collision rate of
particles can be treated as the coagulation rate -
