The numerical analysis and performance simulation of a sudden expansion with fence viewed as a diffuser are presented in this paper. SIMPLE algorithm is used to solve two-dimensional steady differential equations for conservation of mass and momentum. The Reynolds number is in the range of 20 to 100 and fence subtended angle (FSA) between 10 ̊ to 30 ̊. The location of fence from throat varies fro...

OBJECTIVE To evaluate the effect of a bridge safety fence in preventing suicide. METHODS We examined suicides from jumping off the Memorial Bridge in Augusta, Maine, from 1 April 1960 to 31 July 2005. The safety fence was installed during 1983, the mid-point of the study period. RESULTS 14 suicides from the bridge were identified; all occurred before installation of the safety fence. The nu...

In this paper, we introduce a modified fence fill algorithm for filling a polygon. Fence fill algorithm is a modified edge fill algorithm. As opposed to the edge fill algorithm that fills pixels starting from the polygon edge to the maximum screen coordinates, the fence fill algorithm fills pixels bounded by the polygon edge and the fence. This involves large number of calculations to find the ...

The effects of a porous fence with a nonuniform porosity on flow fields are investigated numerically. First, an experiment with a non-uniform porous fence located in a wind tunnel is performed to obtain a reference data set. Then, a numerical model that utilizes the finite volume schemewith a weakly compressible-flowmethod to solve the continuity and momentum equations is developed. The numeric...

In this paper, a numerical study on pressure characteristics of fluid passing through a configuration of sudden expansion with central restriction only and sudden expansion with central restriction and fence has been carried out. The two dimensional steady differential equations for conservation of mass and momentum are solved for Reynolds number ranging from 50 to 200, percentage of central re...

In this study SiltSaver belted strand retention fence was compared with traditional type C silt fence with the goal of determining if it would be acceptable for use as a sediment barrier in Georgia. ASTM standard methods were used to evaluate flow through and sediment removal efficiency using three different site specific soils. For flow without sediment, there were no statistical differences, ...

The presence of large-scale vortices with high spanwise coherence has been observed in the atmospheric boundary layer (ABL). This study investigates an innovative technique to generate a large-scale spanwise vortex from the oscillation of a surface-mounted fence in a wind tunnel. Characteristics of the large vortex with a well-defined length scale and its development with downstream distance be...

Veterinary cordon fences are used in Southern Africa to separate wildlife from domestic animals in order to prevent transmission of infectious diseases. Such fences are a control method recognized by the World Organization for Animal Health (OIE) for establishing disease-free zones in beef exporting countries. However, few studies have evaluated the ecological impact of these physical barriers ...

For some emergency situations an effective response can be reliant on sensor data (e.g. river level, traffic flow, weather conditions) to provide situation awareness, in order to help authorities make informed decisions. Gathering data in a traditional approach, i.e. using precise physical sensors, is a highly expensive task, involving procurement, installation and maintenance of a number of se...