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Effects of random-walk size on the structure of diffusion-limited aggregates.

The step size of random walks is shown to exhibit an important role in controlling the structure of clusters produced ,by the diffusion-limited aggregation (DLA) processes. In this study, the structural compactness is found to increase significantly as the random-walk size is increased. The step-size effects are precisely quantified by the radius of gyration evaluated during the cluster growth process. It is also observed that by using a very long random walk the DLA model approaches the Void-Sutherland ballistic aggregation model.