Direct numerical simulation of disturbances generated by periodic suction-blowing in a hypersonic boundary layer |
| |
Authors: | I V Egorov A V Fedorov V G Soudakov |
| |
Institution: | (1) Moscow Institute of Physics and Technology, 16 Gagarin Street, Zhukovsky, Moscow Region, 140180, Russia |
| |
Abstract: | A numerical algorithm and code are developed and applied to direct numerical simulation (DNS) of unsteady two-dimensional
flow fields relevant to stability of the hypersonic boundary layer. An implicit second-order finite-volume technique is used
for solving the compressible Navier–Stokes equations. Numerical simulation of disturbances generated by a periodic suction-blowing
on a flat plate is performed at free-stream Mach number 6. For small forcing amplitudes, the second-mode growth rates predicted
by DNS agree well with the growth rates resulted from the linear stability theory (LST) including nonparallel effects. This
shows that numerical method allows for simulation of unstable processes despite its dissipative features. Calculations at
large forcing amplitudes illustrate nonlinear dynamics of the disturbance flow field. DNS predicts a nonlinear saturation
of fundamental harmonic and rapid growth of higher harmonics. These results are consistent with the experimental data of Stetson
and Kimmel obtained on a sharp cone at the free-stream Mach number 8. |
| |
Keywords: | hypersonic flow boundary layer stability numerical simulation |
本文献已被 SpringerLink 等数据库收录! |