Experiments on the Nonlinear Instability of Supersonic Boundary Layers

Detailed Comparison of DNS with PSE for Oblique Breakdown at Mach 3

“…The simulation setup for the DNS in this abstract follows Mayer et al 6,7 Supersonic flow at Mach 3 over a flat plate is investigated numerically using spatial DNS. The physical conditions of the simulations match the Princeton wind tunnel conditions: 13 the unit Reynolds number formed with the free-stream velocity and free-stream viscosity at the inflow was Re = 2.181 × 10 6 m −1 and the free-stream temperature is T * ∞ = 103.6K.…”

“…The physical conditions of the simulations match the Princeton wind tunnel conditions: 13 the unit Reynolds number formed with the free-stream velocity and free-stream viscosity at the inflow was Re = 2.181 × 10 6 m −1 and the free-stream temperature is T * ∞ = 103.6K. In the following, details of the computational setup are given and then information on governing equations, boundary conditions, disturbance generation and numerical method are repeated from Mayer et al 6,7 for completeness and convenience of the reader.…”

“…In order to ensure that this assumption is indeed valid, a new DNS has been conducted in which the artificial symmetry restriction was removed. As a first part, the final conference paper will show results from this simulation and additional longer time-average from the original symmetric simulation of Mayer et al 7 (CASE 3). Simulations of the complete transition process as in Mayer et al 7 provide a valuable and extensive database that can be utilized for the validation of several different engineering tools across the various stages of transition.…”

“…As a first part, the final conference paper will show results from this simulation and additional longer time-average from the original symmetric simulation of Mayer et al 7 (CASE 3). Simulations of the complete transition process as in Mayer et al 7 provide a valuable and extensive database that can be utilized for the validation of several different engineering tools across the various stages of transition. The second part of the final conference paper will therefore compare DNS results of the early and late nonlinear stages to data from NASA's LASTRAC code.…”

“…This issue was addressed by the final part of the series of numerical studies, 6,7,9 where the entire transition path of oblique breakdown for a flat-plate boundary layer at Mach 3 was simulated. The DNS in these references, however, had one shortcoming, that is, the flow was assumed to be symmetric in the spanwise direction to reduce computational costs.…”