HTR solver: An open-source exascale-oriented task-based multi-GPU high-order code for hypersonic aerothermodynamics

Direct numerical simulation of a hypersonic transitional boundary layer at suborbital enthalpies

“…An expanded version of that inset is provided in figure 14 in appendix A over a much longer streamwise region for verification purposes, where the distributions of and obtained from a full 2-D numerical simulation of the same Mach-10 undisturbed boundary layer are compared against the locally self-similar solution (see also the verification exercise for a Mach-6 laminar boundary layer provided in figure 7 in Di Renzo et al. 2020). Perfect agreement between the locally self-similar theory and the DNS or full 2-D numerical simulations is not expected, since the theory is known to underperform because it is based on the assumption of uniform pressure across the boundary layer, which becomes an increasingly less accurate assumption as the Mach number increases (Anderson 2006).…”

“…To quantify these processes, the simulations account for five species, namely N 2 , O 2 , O, NO and N, which react according to the chemical mechanism for air dissociation proposed by Park (1989a,b). The simulations include multicomponent transport and equilibrium vibrational excitation, and are performed with the multi-GPU high-order code HTR (Di Renzo et al 2020).…”

“…This section outlines the formulation and computational set-up of the problem, including the conservation equations, boundary conditions, flow parameters and spatiotemporal resolution. In-depth details about the numerical methods, thermophysical and transport properties, and computational solver employed to address this problem can be found in Di Renzo, Fu & Urzay (2020).…”

“…The resulting set of algebraic equations is implemented and solved by the hypersonics task-based research (HTR) solver (Di Renzo et al. 2020). The HTR solver leverages the runtime Legion (Bauer et al.…”

“…Further details of the formulation such as thermophysical and transport properties, numerical methods and computational aspects of the HTR solver are provided in Di Renzo et al. (2020), along with an extensive set of verification tests that includes a transitional hypersonic boundary layer.…”