Numerical modeling of three-dimensional vortex structures in hypersonic transverse flow past a cylinder

Three dimensional vortex modes of hypersonic steady-state flow on the blunted bodies leading age

“…The third mechanism was proposed in works 3,4 where it was shown that in case of transverse hypersonic (M ∞ ≥ 5) flow past bodies with cylindrical bluntness of the frontal surface, a steady-state 3D flow mode consisting of paired vortices that are periodic along Z axis of the cylinder can exist simultaneously with a plane (two-dimensional) mode. Physical essence of the third mechanism is the following.…”

“…[1][2][3][4][5] One can distinguish three basic mechanisms representing physical reasons for the development of such structures: I) external excitation of vortices induced by spatial inhomogeneity of the free stream or boundary conditions on the body; II) internal excitation caused by the development of transverse flow instability in the neighborhood of the leading stagnation line (Taylor-Görtler instability, for example) 2 ; III) self-generation of spanperiodic structures under homogeneous external conditions supported by a strong interaction between the bow shock and the vortex flow in the compressed layer. [3][4][5] The fact that vortex structures can appear as a result of external impact is theoretically understood and in the present study the first mechanism is considered only as one way of initial perturbation of the primary (plane) flow mode.…”