A computational investigation of laminar shock/wave boundary layer interactions

Abstract

Hypersonic laminar flow past a compression corner has been numerically investigated using time-accurate computational fluid dynamics (CFD) approach. Two flow conditions were considered relevant to high and low enthalpy conditions with a total specific enthalpy of 19MJ/kg and 2 . 8MJ/kg. The Mach number and unit Reynolds number per metre were 7 . 5, 9 . 1 and 3 . 10 × 10 5 and 32 . 2 × 10 5 respectively. These free stream conditions provided attached, incipiently separated and fully separated flows for ramp angles between θ w = 5° to 24°. A grid independence study has been carried out to estimate the sensitivity of heat flux and skin friction in the strong interaction regions of the flow. The investigation was carried out assuming the flow to be laminar throughout and high temperature effects such as thermal and chemical nonequilibrium are studied using Park's two temperature model with finite rate chemistry. A critical comparison has been made with existing steady state computational and experimental data and the study has highlighted the importance of high temperature effects on the flow separation and reattachment.

Hypersonic compression corner flow with large separated regions

“…(1997), Olejniczak & Candler (1998) and Deepak et al. (2013). Separate grid independence studies were carried out for these flow conditions by Olejniczak & Candler (1998) and Deepak et al.…”

“…This is a much studied SBLI configuration at supersonic and hypersonic speeds both experimentally (for example, Holden 1966; Lewis, Kubota & Lees 1968; Délery & Marvin 1986; Mallinson, Gai & Mudford 1997), and numerically (Hung & MacCormack 1976; Rudy et al. 1989; Olejniczak & Candler 1998; Deepak, Gai & Neely 2013). These studies present an exhaustive discussion and analyses of both experimental as well as numerical simulations, which have shown agreement of varying degrees with one another.…”

“…This flow condition has been used along with a higher specific enthalpy and lower Reynolds number and Mach number flow condition by Deepak et al. (2013) in another numerical investigation to study the effect of real gas models on separated flows.…”

“…Separate grid independence studies were carried out for these flow conditions by Olejniczak & Candler (1998) and Deepak et al. (2013) for corner angles and . For , Olejniczak & Candler (1998) indicated grid independence with cells.…”

“…Deepak et al. (2013), on the other hand, used a much coarser grid with cells, using the time accurate code Eilmer3 of Jacobs & Gollan (2010).…”