In this paper, the three-dimensional (3D) flow of a jet in a crossflow was investigated. This is a numerical study based on a vortex particle method. In order to account for the lower length scales, a crude LES turbulence model was implemented together with a regridding procedure. The numerical simulation was done with an injection ratio R inj = W jet /U ∞ = 4.0. The code was run until an averaged steady state of the jet was reached. The resulting vortex structures were shown to be consistent with previously published analyses of the flow, from both experiments and numerical simulations. In particular, the onset of counter-rotating vortex pairs (CVP) was also investigated.

No abstract

A horizontal co-current stratified two-phase flow was studied in a duct with a rectangular section. Its dimensions were such that the top and side walls did not influence the interfacial waves. The film thickness was almost of the millimeter. The Reynolds number based on the mean height and velocity in each phase varied from 0 to 1.16•10 5 in air and from 69 to 271 in water. These experimental conditions allowed the observation of the smooth, 2-D wavy and 3-D wavy stratified flow patterns. The interfacial waves were instantaneously measured on a 100 mm long line segment in the longitudinal midspan plane of the channel with the Level Detection and Recording technique. These measurements yielded statistical characteristics and highlighted the spectral differences between the 2-D and 3-D wavy stratified flow patterns.

No abstract

No abstract