The nonlinear behavior of two-dimensional and three-dimensional Kelvin-Helmholtz (KH) instabilities and their interactions in confined compressible mixing layers is investigated using a series of direct numerical simulations of confined compressible shear layers for a range of supersonic convective Mach numbers. It was found that compressibility effects play a significant role in the overall shape of the two-dimensional KH rollup. High Mach number simulations of KH instabilities indicate that the structure is more elongated and flattened compared to its incompressible counterpart. Results of three-dimensional numerical simulations of instabilities show that, as the Mach number is increased, the role of two-dimensional disturbances is decreased, with the three-dimensional disturbances grow faster than the two-dimensional counterparts. The three-dimensionality is also found to play a more significant role in mixing as the Mach number is increased.
AIAA, Fluid Dynamics, 21st Plasma Dynamics and Lasers Conference, 21st, Seattle, WA, June 18-20, 1990. 17 p.
- Pub Date:
- June 1990
- Compressible Boundary Layer;
- Kelvin-Helmholtz Instability;
- Mach Number;
- Mixing Layers (Fluids);
- Three Dimensional Boundary Layer;
- Two Dimensional Boundary Layer;
- Compressible Flow;
- Computational Fluid Dynamics;
- Shear Layers;
- Fluid Mechanics and Heat Transfer