Wind sheltering effect of a small railway station shelter and its impact on wind comfort for passengers

Abstract

Shelters, instead of buildings, are used at small railway stations in Switzerland to protect waiting passengers from environmental loading such as wind, rain and sun. As they are mostly located on open terrain, small railway stations are exposed to wind and therefore require wind comfort analysis. Generally, the same shelter design is used for a large number of different railways stations at locations with different local climates. These shelters have to be designed carefully to protect the passengers for a large number of weather conditions with, for example, different wind speeds and wind directions. In this paper, a wind comfort study for a prototype of a railway station shelter is presented. Computational fluid dynamics (CFD) simulations are conducted to predict the local wind velocities in and around the shelter. The results based on amplification factors show a good wind sheltering efficiency of the prototype for most common weather conditions in Switzerland. Because the side and back walls of the shelter do not reach the ground, high wind velocities can be obtained at the level of the feet and legs. Simulations with modified side and back wall geometries show that the wind sheltering efficiency can be improved by introducing small modifications.

Rain sheltering analysis in semi-outdoor environments: case study on passenger comfort in a railway station shelter

“…The resulting computational grid is composed of mainly hexahedral cells. The computational grid is chosen based on a grid-sensitivity study presented in Allegrini and Kubilay (2017). Three grids are created with the aim to investigate the sensitivity of wind-flow profiles on the cell refinement near walls as well as within the critical waiting area under the shelter roof.…”

“…0.1 mm/h, it can be stated that the clearance has no impact on the rain exposure within the waiting area. Note that the increased wind speed through the clearance can also have an impact on wind comfort and can increase wind-chill effect in winter (discussed in Allegrini and Kubilay (2017)). However, these influences are outside of the scope of the present study.…”

“…In the present paper, CFD simulations of WDR are performed based on an EM model in order to analyse rain infiltration within a prototype of a shelter design based on which Allegrini and Kubilay (2017) performed a wind comfort study. It is aimed to determine the critical meteorological conditions for the passengers in such a semioutdoor geometry.…”