New large-scale off-lattice simulations of 2d diffusion-limited aggregation (DLA) show a richness of cluster morphology approaching electrochemical, fluid, and dielectric experimental systems. Contrary to common belief, the birth, death, and step size of the random walkers are critical in determining asymptotic cluster shape. Numerical instabilities mimic dense radial growth experiments with outer tip suppression, while enhancement produces single arm dominance.
RICHARD F. VOSS (1993). BIRTH, DEATH, STEP SIZE, AND THE SHAPE OF DLA. , 01(02), 141-147. https://doi.org/10.1142/s0218348x93000162