A coupled multiphase-multicomponent lattice Boltzmann model (LBM) is developed to predict water-vapor crystallisation and dendritic growth on sub-cooled substrates exposed to humid airflow. The gas-to-solid phase transition is handled by a kinetic crystallisation model that is fully coupled with a thermal solver within the LBM framework. The model explicitly resolves the diffusion of vapour, latent-heat release, and anisotropic surface kinetics, allowing the preferential growth orientation of ice dendrites to be prescribed. By tuning the anisotropy strength, porous ice layers with controlled pore topology are generated directly from the simulation. Systematic computations reveal that both the degree of wall supercooling and the free-stream air velocity dominate the resulting dendrite morphology, spacing, and porosity. The approach provides a promising attempt toward  tailoring frost structures in heat- and mass-transfer applications.

Lattice Boltzmann method;,supercooled surfaces,frosting water-vapor crystallisation,dendritic growth