The interaction of the gas jet with the molten layer during reactive-gas assisted laser cutting is investigated. The Navier-Stokes equations in each region are solved with an implicit finite-difference algorithm. The erosion front is modeled as a free surface and its profile is determined from the interaction. Equilibrium oxidation reactions are assumed and the laser is operating in TEM00 mode. Results for laser cutting of 3.175 mm and 6.35 mm thick mild steel with an oxygen jet are presented to illustrate the details of the gas jet/molten layer interaction.

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