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arXiv · 2601.15440

Numba-Accelerated 2D Diffusion-Limited Aggregation: Implementation and Fractal Characterization

Sandy H. S. Herho·Faiz R. Fajary·Iwan P. Anwar·Faruq Khadami·Nurjanna J. Trilaksono·Rusmawan Suwarman·Dasapta E. Irawan
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Abstract

We present dla-ideal-solver, a high-performance framework for simulating two-dimensional Diffusion-Limited Aggregation (DLA) using Numba-accelerated Python. By leveraging just-in-time (JIT) compilation, we achieve computational throughput comparable to legacy static implementations while retaining high-level flexibility. We investigate the Laplacian growth instability across varying injection geometries and walker concentrations. Our analysis confirms the robustness of the standard fractal dimension $D_f \approx 1.71$ for dilute regimes, consistent with the Witten-Sander universality class. However, we report a distinct crossover to Eden-like compact growth ($D_f \approx 1.87$) in high-density environments, attributed to the saturation of the screening length. Beyond standard mass-radius scaling, we employ generalized R\'{e}nyi dimensions and lacunarity metrics to quantify the monofractal character and spatial heterogeneity of the aggregates. This work establishes a reproducible, open-source testbed for exploring phase transitions in non-equilibrium statistical mechanics.

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Sandy H. S. Herho, Faiz R. Fajary, Iwan P. Anwar, Faruq Khadami, Nurjanna J. Trilaksono, Rusmawan Suwarman, Dasapta E. Irawan. 2026-01-21. Numba-Accelerated 2D Diffusion-Limited Aggregation: Implementation and Fractal Characterization. https://arxiv.org/abs/2601.15440

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