TY - GEN
T1 - DNS of complete transition to turbulence via oblique breakdown at mach 3
AU - Mayer, Christian S.J.
AU - Von Terzi, Dominic A.
AU - Fasel, Hermann F.
PY - 2008
Y1 - 2008
N2 - A pair of oblique waves at low amplitudes is introduced in a supersonic at-plate boundary layer. Its downstream development and the concomitant process of laminar to turbulent transition is then investigated numerically using Direct Numerical Simulations (DNS). In the present paper, first the linear regime is studied in great detail. Comparisons to linear stability theory clearly determine that the so-called "oblique breakdown" mechanism is initiated. The focus of the second part is the nonlinear regime. It is shown how the spectrum is filled up by nonlinear interactions, what flow structures arise and how these structures locally break down to small scales. Finally, a logarithmic region of the mean streamwise velocity profile is formed indicating the beginning of a fully turbulent flow region. The simulations demonstrate that oblique breakdown is a viable path to turbulence.
AB - A pair of oblique waves at low amplitudes is introduced in a supersonic at-plate boundary layer. Its downstream development and the concomitant process of laminar to turbulent transition is then investigated numerically using Direct Numerical Simulations (DNS). In the present paper, first the linear regime is studied in great detail. Comparisons to linear stability theory clearly determine that the so-called "oblique breakdown" mechanism is initiated. The focus of the second part is the nonlinear regime. It is shown how the spectrum is filled up by nonlinear interactions, what flow structures arise and how these structures locally break down to small scales. Finally, a logarithmic region of the mean streamwise velocity profile is formed indicating the beginning of a fully turbulent flow region. The simulations demonstrate that oblique breakdown is a viable path to turbulence.
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U2 - 10.2514/6.2008-4398
DO - 10.2514/6.2008-4398
M3 - Conference contribution
AN - SCOPUS:78049508414
SN - 9781563479427
T3 - 38th AIAA Fluid Dynamics Conference and Exhibit
BT - 38th AIAA Fluid Dynamics Conference and Exhibit
PB - American Institute of Aeronautics and Astronautics Inc.
ER -