Identification of starting transients in a reflected shock tunnel

When high Mach number nozzles are used on reflected-shock tunnels, there is a significant (and undesirable) delay before the test flow settles to a useable steady state. Previous studies, in which the transients flow through a typical nozzles have been simulated, have not been able to identify the mechanisms causing the delay and so we shall attempt to simulate the flow in an entire shock-tube/nozzle combination. The simulation tools to be used are MB_CNS, which is a finite-volume code which now runs in parallel on the Power Challenge, and CEVCATSN, which is a multiblock, multigrid code developed at DLR, Gottingen.

Publications:

1. Jacobs, P. A. "MB_CNS: A computer program for the simulation of transient compressible flows." Department of Mechanical Engineering Report 10/96, December 1996.
2. Hannemann, K., Jacobs, P. A., Austin, J. M., Thomas, A. and McIntyre, T. J. "Transient and steady-state flow in a small shock tube." 21st International Symposium on Shock Waves Paper 2630, July 1997