Types of Mach Reflection
The only type of Mach reflection possible in steady flow is direct Mach reflection, in which the Mach stem is convex away from the oncoming flow, and the slip plane slopes towards the reflection surface. In unsteady flow, the triple point will move away from the surface. In unsteady flow, it is also possible that the triple point remain stationary relative to the surface (stationary Mach reflection), or move toward the surface (inverse Mach reflection). In inverse Mach reflection, the Mach stem is convex toward the oncoming flow, and the slip plane curves away from the boundary.
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