Abstract: High-energy explosive detonation diffraction is simulated with a 2D Lagrangian unstructured mesh detonation fluid program. With EOS of JWL and trinomial reaction rate, numerical result by Lagrangian program agrees with experimental result qualitatively. Phenomena of whirlpool is well simulated. Desensitization is added to reaction rate in simulation of dead zone in insensitive high explosives detonation diffraction. The dead zone is captured. The result agrees with reported data qualitatively.

Key words: detonation, detonation diffraction, Lagrangian, dead zone, desensitization