A 2D numerical model is developed to investigate the transient dynamics of molten pool and thus the burformation mechanism in millisecond pulsed laser drilling process. The model features the utilization of the sharpinterface method for accurate consideration of the complex boundary conditions on the hole wall and acomprehensive hydrodynamic calculation for both the gaseous and liquid phases. The model gives goodprediction of the bur phenomena, and more importantly, provides detailed information regarding the multi-phaseinteraction and its effects on hole dynamics, also on the bur formation. It is shown that different substrate cancause different coupling effects between the vapor plume and molten pool and hence produce holes of differentshapes. The model gives a basic study of the bur formation during the ablation process of different metals andshows a virtual technique for the visual of the movement of melt and vapor. And the obtained results show goodqualitative correspondence with experimental data.
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