Direct numerical simulation of the flow in a flue pipe

The flow behavior of a geometrically simplified flue pipe has been investigated by direct numerical simulation for jet Reynolds numbers of Re = 368; 490; 613. The flow process starts with the formation of a planar ring vortex at the flue exit, which travels towards the upper lip of the pipe. In the following Kelvin-Helmholtz instability appears...

Wavelet analysis of broadband signals to extract amplitude and frequency modulation: An application to wall turbulence

Large-scale structures in wall-bounded turbulent flows are known to exhibit a coupling with the small-scale energy in the flow. Besides a superposition of large-scale energy onto the near-wall dynamics, this coupling comprises an amplitude and frequency modulation of the small-scale fluctuations by the large-scale motions. In this work we use...