A study on C, H and L type prismatic buildings for Synoptic wind flow.

Abstract

The atmospheric boundary layer can be defined as part of the troposphere at the lowest level which is influenced by the presence of the earth’s surface, and responds to surface forcing within a timescale of about an hour or less. The boundary layer depth might differ from hundreds of meters to a few kilometers.  The wind that blows due to Atmospheric Boundary Layer is known as synoptic wind. Moreover, thunderstorms occur frequently in the eastern and north-eastern part of India are prone to thunderstorms. Since 1976,the first severe, cyclonic storm to have formed in April in India’s oceanic neighborhood is Cyclone Fanias per Indian Meteorological Department (IMD). Data from the IMD’s cyclone-statistics unit show that the Bay of Bengal and Arabian Sea have communally registered 46 severe cyclonic storms in between 1965-2017. Building structures are highly effected due to extreme wind conditions during thunderstorm or synoptic winds which results in extensive damage. This happens when the aerodynamic loads due to high speed synoptic wind significantly exceed the design loads of the building structure. The main subject of study in this paper is the use of numerical simulation for flow patterns and pressure distribution around building structures of different geometrical shapes under the influence of synoptic wind. Commercially available software ANSYS CFX 16 solver has been used for the numerical simulation. The study shows that the flow pattern around the buildings and the pressure distribution on the building surfaces are significantly influenced by building shape.