基于次近邻条件下局部区域粒子源聚集生长的模拟研究

摘要

Basing on the model of DLA, the process of aggregation' s growth for random walk particles from local area with the condition of next-nearest-neighbor is simulated. The simulation finds that the aggregation growth with the condition of next-nearest-neighbor is the basically same with the condition of nearest-neighbor. The rate of aggregation is different in different directions, the centre of the aggregation is on the line which between the particle source' s symmetric centre and the seed particle, and more closer the particle source than seed particle. The whole aggregation still shows the fractal structure, but the fractal dimension is smaller than the condition of the nearest-neighbor.%以DLA模型为基础,模拟研究了基于次近邻条件下,由局部区域产生随机运动粒子的聚集生长过程.模拟发现次近邻条件下凝聚集团的生长情况与最近邻情况下的生长情况大致相同,凝聚集团的各向生长速率不等,集团的中心仍处于粒子源对称中心和种粒子的连线上,比种粒子更加接近粒子源；凝聚集团整体仍呈分形结构,但集团的分形维数却比最近邻条件下的情况小很多.