A numerical analysis of muzzle blast precursor flow

A new computational technique, involving the formation of grids by conformal mappings, the use of the λ-scheme and of shock fittings is applied to solve the Navier-Stokes equations which describe the flow field behind the precursor shock consequent to the firing of a gun, until the bullet is entirely out of the barrel. The numerical analysis is presented in detail and reasons for the choice of the technique are discussed. Three examples are presented, discussed and compared with experimental results.