TY - GEN
T1 - Numerical investigation of nonlinear entropy-layer instability waves for hypersonic boundary-layers
AU - Hartman, Andrew B.
AU - Hader, Christoph
AU - Fasel, Hermann F.
N1 - Funding Information:
This work was supported by ONR Grant N000141712338, with Dr. Eric Marineau serving as the program manager. Computer time was provided by the US Army Engineering Research and Development Center (ERDC) under the Department of Defense (DOD) High Performance Computing Modernization Program (HPCMP). The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the Air Force Office of Scientific Research or the U. S. Government. We acknowledge the many fruitful discussions with Dr. Eric Marineau, Dr. Stefan Wernz (Raytheon Technology), Dr. Stuart Laurence, Dr. Stefan Hein (DLR) John Meersman (CFD Laboratory, University of Arizona) and Anthony Haas (CFD Laboratory University of Arizona) who also carried out the LST calculations.
Publisher Copyright:
© 2020, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2020
Y1 - 2020
N2 - Direct Numerical Simulations (DNS) were carried out to investigate the laminar-turbulent transition for a blunt (right) cone (7◦ half-angle) at Mach 5.9 and zero angle of attack. First, (linear) stability calculations were carried out employing the same DNS Navier-Stokes solver and using very small disturbance amplitudes in order to capture the linear disturbance development. Contrary to standard Linear Stability Theory results, these investigations revealed a strong “linear” instability in the entropy layer region for a very short downstream distance for oblique disturbance waves with spatial growth rates far exceeding those of second mode disturbances. This linear instability behavior was not captured with conventional LST and/or the Parabolized Stability Equations (PSE) approach. Secondly, a highly-resolved nonlinear breakdown simulation was performed using high-fidelity DNS. The DNS results showed that linearly unstable oblique disturbance waves, when excited with large enough amplitudes, lead to a rapid breakdown and complete laminar-turbulent transition in the entropy layer just downstream of the blunted nose.
AB - Direct Numerical Simulations (DNS) were carried out to investigate the laminar-turbulent transition for a blunt (right) cone (7◦ half-angle) at Mach 5.9 and zero angle of attack. First, (linear) stability calculations were carried out employing the same DNS Navier-Stokes solver and using very small disturbance amplitudes in order to capture the linear disturbance development. Contrary to standard Linear Stability Theory results, these investigations revealed a strong “linear” instability in the entropy layer region for a very short downstream distance for oblique disturbance waves with spatial growth rates far exceeding those of second mode disturbances. This linear instability behavior was not captured with conventional LST and/or the Parabolized Stability Equations (PSE) approach. Secondly, a highly-resolved nonlinear breakdown simulation was performed using high-fidelity DNS. The DNS results showed that linearly unstable oblique disturbance waves, when excited with large enough amplitudes, lead to a rapid breakdown and complete laminar-turbulent transition in the entropy layer just downstream of the blunted nose.
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U2 - 10.2514/6.2020-3085
DO - 10.2514/6.2020-3085
M3 - Conference contribution
AN - SCOPUS:85092779096
SN - 9781624105982
T3 - AIAA AVIATION 2020 FORUM
BT - AIAA AVIATION 2020 FORUM
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA AVIATION 2020 FORUM
Y2 - 15 June 2020 through 19 June 2020
ER -