We have used computational fluid dynamics to study changes in lift generation and vortex dynamics for Reynolds numbers (Re) between 8 and 128. The immersed boundary method was used to model a two-dimensional wing through one stroke cycle. We calculated lift and drag coefficients as a function of time and related changes in lift to the shedding or attachment of the leading and trailing edge vort...

We numerically study the nucleation of gray solitons and vortex–antivortex pairs created by a moving impurity in, respectively, 1D and 2D Bose–Einstein condensates (BECs) confined by a parabolic potential. The simulations emulate the motion of a localized laser-beam spot through the trapped condensate. Our results for the 1D case indicate that, due to the inhomogeneity of the BEC density, the c...

This paper delineates experimental and numerical results concerning the effect of the stratification and the tilt on the 3D instabilities of a cylinder wake led at moderate Reynolds numbers from the 2D von Karman vortex street. For a vertical cylinder, shadowgraph visualisations put forward an unstable mode similar to the mode A well known in homogeneous fluids. When the cylinder is tilted a ne...

The characteristics of flow structures around a colony-type emergent roughness model, hereafter called ‘colony model’, mounted on a flat plate in uniform flow and the drag coefficient Cdc for the colony model are investigated by flow visualization, spectral analysis, velocity measurement and drag force measurement. Two types of colony models, each comprising seven equally spaced cylinders with ...

Recent advances in geostationary imaging have enabled the derivation of high spatiotemporal-resolution cloud-motion winds for study mesoscale unsteady flows. Due to general absence ground truth, quality assessment satellite is challenging. In current limited practice, straightforward plausibility checks on smoothness retrieved wind field or tests aggregated trends such as mean velocity componen...

In this paper a measurement of static pressure in the wake behind circular cylinder for different Reynolds numbers is presented. For purpose, probe with built-in transducer was used. The main goal to describe unsteady field and determine frequency generated Von Kármán vortex street. conducted low speed wind tunnel 110 mm diameter. results were compared an RANS simulation.