2008年11月5日 · At the upstream end of the puff, a quasi-periodic regeneration of streamwise vortices takes place. Initially, the vortex structure resembles a travelling wave solution, but as …

2025年2月19日 · The formation of low-speed streaks and the lift-up of three-dimensional (3D) waves (which is the same as soliton-like coherent structures in the boundary layer) upstream …

2009年2月13日 · At the upstream end of the puff, a quasi-periodic regeneration of streamwise vortices takes place. Initially, the vortex structure resembles a travelling wave solution, but as …

2024年5月15日 · The mean azimuthal flow of puff, a key structure of the subcritical transition in pipe flow, is studied numerically and theoretically in this Letter. It is revealed that the mean …

2023年10月16日 · The results of numerical simulation of the formation and motion of turbulent vortex clouds (puffs) resulting from the blowing of pulsed jets with various initial velocities and …

streamwise vortices takes place. Initially, the vortex structure resembles a travelling wave solution, but as the vortices propagate into the turbulent region of the puff, they continue to …

Initially, the vortex structure resembles a travelling wave solution, but as the vortices propagate into the turbulent region of the puff, they continue to develop into strong hairpin vortices.

The structure of the turbulent puff in a laminar pipe flow is investigated experimentally. It is found that the rear interface of the puff appears to generate toroidal vortices by means of an …

2009年2月13日 · This structure provides a possible explanation for the intermittent character of the puffs in pipe flow at low Reynolds numbers. From time-resolved stereoscopic particle …

2008年11月5日 · The structure of the turbulent puff in a laminar pipe flow is investigated experimentally. It is found that the rear interface of the puff appears to generate toroidal …