  Lattice Boltzmann Method (LBM) is used to simulate and analyze the
sedimentation of small ($15-80 \,\mu m$) columnar ice particles in the
atmosphere. We are specially interested in evaluating the terminal falling
velocity of columnar ice crystals with hexagonal cross section. The main
objective is to apply the LBM to solve ice crystal sedimentation problems. This
numerical method is evaluated as a powerful numerical tool to solve ice crystal
sedimentation problems in a variety of sizes. LBM results are presented in
comparison with laboratory experimental results and theoretical approaches well
known in the literature. The numerical results show good agreement with
experimental and theoretical results for the analyzed geometrical
configurations.
