TY - GEN
T1 - Analysis of spanwise homogeneous perturbations in laminar hypersonic shock-boundary layer interactions
AU - Sawant, Saurabh S.
AU - Tumuklu, Ozgur
AU - Theofilis, Vassilis
AU - Levin, Deborah A.
N1 - Publisher Copyright:
© 2020 American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2020
Y1 - 2020
N2 - This work investigates the self-excited spanwise homogeneous perturbations arising in a shock-wave/boundary-layer interaction (SWBLI) system formed in a hypersonic flow of molecular nitrogen over a double wedge using the kinetic Direct Simulation Monte Carlo (DSMC) method. The flow has a Knudsen and unit Reynolds numbers of 3.4 × 10−3 and 5.2 × 105 m−1, respectively. Strong thermal nonequilibrium exists downstream of the Mach 7 detached (bow) shock generated due to the upper wedge surface. Global linear instability mechanisms are expected to make the pre-computed 2-D base flow potentially unstable under self-excited, spanwise periodic perturbations. Goertler-type vortices are also expected to form due to curved streamlines in the presence of a strong recirculation region. Our specific intent is to assess the growth rates of unstable modes, the wavelength, location, and the origin of spanwise periodic flow structures, and the characteristic frequencies present in this interaction.
AB - This work investigates the self-excited spanwise homogeneous perturbations arising in a shock-wave/boundary-layer interaction (SWBLI) system formed in a hypersonic flow of molecular nitrogen over a double wedge using the kinetic Direct Simulation Monte Carlo (DSMC) method. The flow has a Knudsen and unit Reynolds numbers of 3.4 × 10−3 and 5.2 × 105 m−1, respectively. Strong thermal nonequilibrium exists downstream of the Mach 7 detached (bow) shock generated due to the upper wedge surface. Global linear instability mechanisms are expected to make the pre-computed 2-D base flow potentially unstable under self-excited, spanwise periodic perturbations. Goertler-type vortices are also expected to form due to curved streamlines in the presence of a strong recirculation region. Our specific intent is to assess the growth rates of unstable modes, the wavelength, location, and the origin of spanwise periodic flow structures, and the characteristic frequencies present in this interaction.
UR - http://www.scopus.com/inward/record.url?scp=85091745456&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85091745456&partnerID=8YFLogxK
U2 - 10.2514/6.2020-0177
DO - 10.2514/6.2020-0177
M3 - Conference contribution
AN - SCOPUS:85091745456
SN - 9781624105951
T3 - AIAA Scitech 2020 Forum
SP - 1
EP - 14
BT - AIAA Scitech 2020 Forum
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Scitech Forum, 2020
Y2 - 6 January 2020 through 10 January 2020
ER -