For a pair of elastically mounted circular cylinders in tandem configuration, the downstream cylinder may experience wake-induced vibration (WIV) due to hydrodynamic excitation associated with wake behind upstream cylinder. In addition WIV, also be simultaneously subject vortex-induced (VIV) vortex shedding its own wake. This nonlinear coupled wake-vortex interaction can result sustained large-...

Abstract This paper numerically investigates the aerodynamic performance of T106A low-pressure turbine based with different inflow conditions at moderate Reynolds number by using high computing on order unstructured methods. Two respectively uniform and disturbed are considered, while for latter a small circular cylinder is placed upstream cascade to generate wake turbulence as long-standing di...

Wind-tunnel experiments were performed to study the effect of favorable and adverse constant pressure gradients (PG) from local changes in topography right downwind a model wind turbine. Particle image velocimetry was used characterize near intermediate wake regions. We explored five scenarios, two favorable, PG, case with negligible PG. Results show that PGs induce deflection modulate wake. Th...

A square splittered and unsplittered rod is placed in a turbulent boundary layer developed over a flat plate. The effect of the resulting disturbances on the local heat transfer coefficient is then studied. In both cases the square rod modifies the flow structure inside the boundary layer. As a result, a stagnation point, a jet and wake area are generated around the square rod, each making a co...

A wake model for the free-streamline theory is proposed to treat the two-dimensional flow past an obstacle with a wake or cavity formation. In this model the wake flow is approximately described in the large by an equivalent potential flow such that along the wake boundary the pressure first assumes a prescribed constant under-pressure in a region downstream of the separation points (called the...

INTRODUCTION There is limited utilisation of acute stroke reperfusion treatments which have narrow therapeutic windows, with delayed hospital presentation being a major limiting factor in Singapore. Most patients who wake up with symptoms are ineligible for reperfusion treatments as duration from onset time is not known. We studied the profile of wake-up strokes, onset-to-door duration and thei...