We present results of fully compressible Navier-Stokes simulations of pulsating flame instability in two dimensions using single-step, first-order Arrhenius kinetics. Model parameters correspond to Ze = 9.5, Le = 10, and flame Mach numbers M_L between 4.62 × 10~(-3) and 2.31 × 10~(-2). The results show that the pulsating instability in two dimensions creates three types of transverse waves: spontaneous waves, deflagrations, and detonations. All three types of waves can coexist for the same reactive system, but transverse detonations become more likely as M_L increases. They propagate inside the large preheat zone of the pulsating flame and do not spread into cold material.
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