Abstract
A high order direct numerical simulation (DNS) of flow transition over a flat plate at a free stream Mach number 0.5 has been carried out. Formation and development of 3-D perturbations, typically shown as Λ -vortices, hairpin vortices and ring-like vortices were observed. Numerical results show that there is a strong downward motion excited by every ring-like vortex at two sides of the structure centerline. Such downward motions lead to formation of intensive high speed streaks associated with positive spikes observed by experiment in near wall region. Superimposition of two downward motions induced by the first and second ring – like vortices results in maximum streamwise velocity disturbance.
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