The study of the effect of obstacles on flow and dispersion in the atmospheric boundary layer is one of the most important topics in atmospheric dispersion research. Computational Fluid Dynamics (CFD) methods are increasingly used to predict concentration fields near buildings in an operational context, but extensive validations are still needed. In this paper, we analyse the effect on flow and...

The stability boundaries of a very flexible wing are sought to inform wind-tunnel flutter test campaign. objective is twofold: identify via simulation the relevant physical processes be explored while ensuring safe and nondestructive experiments, provide benchmark case for which computational models data freely available. Analyses have been independently carried out using two geometrically nonl...

The development of Doppler Global Velocimetry as a flow diagnostic measurement sy s t em nece s s i t a t ed seve ra l innova t i ons to so l ve problems found during wind tunnel testing. These innovations ranged from ratioing a data image with a reference image to remove scattered light variations, dewarping the images to remove optical distortions, and to the use of virtual wind tunnels creat...

The aim of this study is to investigate and quantify the aerodynamics advantage, physiological performance advantage produced by pacemaker drafting in case long endurance running. experimental tests have been carried out a wind tunnel, at submaximal effort two runners done treadmill run test five minutes 4.72 m/s with same air velocity. By comparison parameters without drafting, decreasing due ...

A wake-controlled exterior hood was developed to overcome the negative influence of cross draft on an exterior hood and avoid the operation inconvenience caused by the enclosure of an airflow capture booth. This new type of local exterior hood used the hood suction flow to stabilize the dynamic vortex shedding that was induced when a crossflow passed over a blockage plate, and therefore formed ...

A large eddy simulation (LES) program with the Smagorinsky subgrid-scale model has been used to study cross natural ventilation in buildings, which has experimental data available from on-site measurements and a wind tunnel. Since natural wind changes direction over time, it is hard to reproduce this effect in a conventional wind tunnel where the “wind” direction is fixed. There are discrepanci...