Numerical simulations and experimental comparisons for high-speed nonequilibrium air flows

Abstract

A computational uid dynamics (CFD) technique is employed to study hypersonic high-enthalpy air ows around blunt bodies with the purpose of predicting convective heat transfer on the body surface for a range of ow velocities relevant to suborbital ight of re-entry vehicles such as the Space Shuttle Orbiter (USA), and the Buran (Russia). The method uses Park's two-temperature model for the description of thermochemical nonequilibrium processes in high-temperature air and solves the full Navier-Stokes equations for a model of multicomponent reacting gas mixture in the ÿnite volume formulation. The calculations performed in this research are intended to simulate some experiments carried out in the high-energy shock tunnels of the DLR, Germany, and the CALSPAN, USA, where the heat ux distribution over a model surface was measured at several freestream conditions related to the range of velocities mentioned above. The main emphasis is on comparing numerical and experimental results in order to verify adequacy of the heat ux data predicted by the CFD technique for suborbital ight speeds of re-entry vehicles.

Carbuncle Phenomena and Other Shock Anomalies in Three Dimensions

“…No turbulence model or real gas model has been used. Detailed information of the solver with regard to formulations and discretizations is found in [31].…”

Numerical Experiments on Anomalies from Stationary, Slowly Moving, and Fast-Moving Shocks

“…After the numerical fluxes through all the cell-interfaces are obtained, those contributions are integrated from cell to cell in the time evolution process, using first-order Euler explicit method. Detailed information of the solver with regard to formulations and discretizations is found in [3,31].…”

Numerical Modeling of Nature Gas Leakage from Underwater Gas Pipeline

“…Численный поток аппроксимируется по методу С. К. Годунова с использованием точного решения задачи Римана о распаде произвольного разрыва [10]. Сеточное восполнение решения реализовано в классе квадратичных функций с использованием интерполяционной схемы 3-его порядка типа MUSCL [11,12] и корректирующим фактором для производных в форме Ван Албада [13].…”