The present paper presents a simulation of a firing process of a 7.62mm bullet and muzzle flow out of a gun barrel. The calculation is made in two stages. First, an internal ballistics (IB) simulation via the IBHVG2 software package, is performed in order to obtain bullet travel dependent breech pressure and temperature. Following this, a simulation of unsteady muzzle flow is made, beginning at the start of bullet motion and ending one meter beyond the muzzle exit point. The second stage calculation is carried out via the CFD-FASTRAN finite volume solver package. The movement of the bullet is simulated by a chimera overset meshing technique. In general, there exists very good agreement between the computed IB and the measured muzzle velocity and pressures, and between the CFD precursors flow field, main propellant flow field calculations and the experimental shadowgraph results.
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