Mathematical Modeling of the Formation of a Shock-Compressed Gas Zone during Oblique Collision of Metal Plates

The paper presents the mathematical modeling of shock-compressed gas region between colliding plates. This phenomenon, widely known in experiments, is still not studied numerically, despite it’s importance for successful welding. A diffuse-interface approach based on the Baer–Nunziato type multifluid model is used. This type of model allows for the necessary flexibility in terms of gas-solid interaction, treating all phases as a compressible medium. An HLLC-type scheme has been implemented to ensure sharp resolution of the plates’ boundaries. Two types of collisions are considered: straight and oblique. The straight collision case is simpler from the computational standpoint and is used as a reference point to study mesh convergence and influence of the flyer plate speed on the process of the gas jet formation. In the oblique case, the paper presents one of the first results, showing the formation and evolution of the shockcompressed gas region ahead of the plates collision point. The results prove the applicability of the chosen diffuse-interface model to the problem.