Reply To: Simulation of a jet of air into a shock tube

[bmarjaba]

Below are contours of Mach Number, Velocity Magnitude, and Static Pressure t=0.002079 seconds (before it crashed), and at t=0.0021082 seconds (after it crashed). I also monitored the inlet pressure, the mass flow rate, and the time step.n1) The time step remained constant at 1e-8 for the entire time. It did not change even after it crashed. I had the courant number set to 0.55. I tried increasing it to 0.6 and 0.7 at times and the time step started increasing, then i returned it to 0.55. But at a courant of 0.5 and 0.55, it was constant throughout at 1e-8.n2) The average weighted inlet pressure fluctuated around 6.816-6.82 kPa, before it shot straight up to huge numbers and fluctuating after 0.0021077 seconds, until it crashed. I posted screenshots of the plots of both phases.nn3) The mass flow rate was steadily decreasing below 0.0001 before it crashed. Plots of both phases are shown below.n4) Mach Numbers before and afternn5) Velocity before and aftern5) Static Pressure before and afternnn