Abstract
In the present study, it was aimed to compare the effects of the different distances between four buildings placed in a wind area on the surface pressure distributions and flow structures around the building. For this purpose, ANSYS-FLUENT 14.0 package program was used and analyses were performed with the RNG k-ɛ turbulence model by 3D-modelling the buildings. The distances between the buildings were initially chosen as half of the building height and then the same as the building height. The average wind velocity was determined by taking the meteorological data for Sivas into consideration and the distributions of the flow line, velocity vector, turbulence kinetic energy and surface pressure coefficients were calculated for the medium height and roof level of the buildings. It is observed from the results that the distances between the buildings significantly affected the flow structures and velocity distributions, positive pressures were effective for front surfaces in the first buildings and negative pressure areas were formed in the rear surfaces and roofs.
Highlights
Due to the housing problems of the urban population that emerged as a result of industrialization, high-rise apartments and housing estates became common in many cities
The maximum positive wind pressure coefficients occurred at a distance of approximately 0.8 - 0.85H to the wind surface and the maximum negative surface pressure occurred at the front side of the top surface
The results indicated that the windward side of the building was exposed to positive pressure while lateral, rear and top surfaces were in negative pressure areas
Summary
Due to the housing problems of the urban population that emerged as a result of industrialization, high-rise apartments and housing estates became common in many cities. Menga et al [2] numerically examined the effects of different turbulence models, flow velocity and grid types on CAARC buildings. As a result of the analyses, it was observed that the flow separation, vortex and dead zone effects were directly affected by wind direction and caused a change in pressure. Hubova [6] examined the flow structures around two buildings placed in a boundary layer wind tunnel with obstacles and coarse elements of different heights inside. Force coefficients for different wind directions, wind velocities and abruptly changing weather conditions were calculated by measuring power spectral densities and acceleration responses. At the end of the analyses, the flow movements at both medium and roof height of the building were obtained and the pressure distributions on the surfaces in all directions of the buildings were calculated
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