Gun Blast
A projectile is initially resting adjacent to the chamber, which is patched at high pressure (3000 atm) and temperature (2700 K). The user-defined real gas law (UDRGM) is used to implement the Abel-Nobel Equation of State (ANEOS). Upon release, the bullet moves as a result of the pressure differential; the 6DOF UDF is used to compute this coupled motion, and the layering scheme from the dynamic mesh (DM) model is utilized. As the bullet begins moving, the gas ahead of it is pushed out to establish the precursor flow. The flow physics is particularly interesting at the instant the bullet "uncorks", i.e., clears the muzzle. A massive blast wave emanates from the gap, and a beautiful barrel shock is formed. Toward the end, the bullet passes the two muzzle brakes, setting up a beautiful shock structure.
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