Time-accurate les of a cone-slice-ramp at mach 6

A cone-slice-ramp geometry in hypersonic flow produces a pair of vortices which interact with the shockwave-boundary layer interaction at the compression ramp. A cone-slice-ramp with a 20^◦ ramp has been simulated at ground-test conditions with time-accurate implicit large-eddy simulations (ILES) performed in the OVERFLOW computational fluid dynamics solver. This analysis demonstrated global instabilities in the flow around the cone-slice-ramp at the compression ramp and in the shedding of vortices from the frustum leading edge. The vortex structure demonstrates periodicity and consistent dominant spectra, while the SWBLI does not. Results of this ILES analysis were time-averaged and compared to existing RANS data. This comparison showed strong agreement between RANS and ILES, especially in the region upstream of the compression ramp. In the ramp region, ILES illuminates small-scale structures in the flow not captured by transitional RANS analysis.