in general, the aerodynamic stability of long span bridges is evaluated based on the results of wind tunnel tests in the low reynolds number region, because in almost all wind tunnel tests, it is impracticable to satisfy reynolds number similitude. therefore, in order to correctly evaluate conventional wind tunnel test results, reynolds number effects on the aerodynamic force coefficients acting o...

Research into hypersonic flow phenomona has been conducted by numerous groups within Australia for over 40 years. The genesis of all the modern day work can be traced back to the return of the then Dr Ray Stalker from England, to take a faculty position in the Physics Department of the Australian National University, Canberra, in 1962. Dr Stalker had a keen interest in the aerodynamics of bodie...

Submitted for the DFD17 Meeting of The American Physical Society Wake instabilities of flow over a spinning circular disk at angle of attack1 MARCUS LEE, TIM COLONIUS, BEVERLEY MCKEON, Caltech — A circular disk spinning about its axis of rotational symmetry is inherently robust to external disturbances due to gyroscopic moments and is therefore a promising configuration for a robust micro air v...

This paper discusses a preliminary study on harnessing energy from piezoelectric transducers by using bluff body and vortex-induced vibration phenomena. Structures like bridges and buildings tend to deform and crack due to chaotic fluid-structure interactions. The rapid variation of pressure and velocity can be tapped and used to power structural health monitoring systems. The proposed device i...

Wind tunnel (WT) experiments were conducted to reproduce the wind-induced deviation of rain drop trajectories when approaching collector catching-type gauges. Three typical outer shapes instrument body (cylindrical, inverted-conical and “chimney” shapes) tested using full-scale models. The airflow pattern upstream above was measured with a Particle Image Velocimetry technique, after injecting p...

Because they grow away from their substratum to compete for light, plants have to withstand hydrodynamic or aerodynamic drag. Both water and land plants reconfigure in response to this drag, and this is presumed to reduce the risk of mechanical failure. However, there is little unequivocal evidence of drag reduction in large trees as a result of reconfiguration. Land plants must also transport ...