A shock wave passes down a vertical pipe containing a combustible gas which is burning slowly.
The wave accelerates the hot-gas fragments more than the cold ones, causing relative motion.
The relative motion causes increased entrainment and mixing, which increases the burning rate.
This increases the strength of the pressure wave.
The result is that the deflagration turns into a detonation.
The graphical plots show the development, the horizontal dimension being time.
The calculation was first performed in 1983.
Velocity vectors of the cooler gas
Velocity vectors of the hotter gas, which has been more greatly accelerated
The contours of pressure
The reactedness of the hotter gas