Transition to chaos in a cross-corrugated channel at low Reynolds numbers

Abstract

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Direct numerical simulation of mechanism and control of secondary instability induced transition in a supersonic boundary layer

“…Further downstream, both the DNS and LST results show that mode (1/2, 1) begins to grow, but the DNS result shows a much larger growth rate that significantly departs from the LST results. The interactions between modes (1, 0) and (1/2, 1) generate mode (3/2, 1), and the self-interaction of mode (1/2, 1) generates mode (1,2). Mode (0, 2) comes from two paths: the interactions between modes (1, 1) and (1, À1) and the fundamental resonance between modes (1, 0) and (1, 2).…”

“…Laminar-turbulent transition has attracted increased attention in designing supersonic aircraft as it significantly influences the friction drag and heat transfer. [1][2][3][4][5] Thus, understanding the physical mechanisms of transition is essential in fluid dynamics. In actual flight environments, the natural transition is a common path to turbulence.…”

Experimental investigation on thermo-hydraulic performance of triangular cross-corrugated flow passages

“…The critical design parameters which affect the heat transfer and pressure drop in cross corrugated plates are corrugation angle (), corrugation pattern, and the ratio of depth to pitch (h ch /P ch ) of the plates [1,[9][10][11][12]. Several experimental and CFD investigations have reported the fundamental nature of the flow for sinusoidal cross-corrugated passages [7,[10][11][12][13][14][15][16] and shown that the fluid never attains a fully developed condition because of the sudden changes in direction due to corrugations and continuous deterioration of the boundary layer [13,17]. In addition to mixing, the small hydraulic diameter and secondary flow formation (Görtler vortices) also contribute to the enhanced thermo-hydraulic performance of corrugated plates [18].…”