Özet:

In this study, wind load on a building having irregular geometry was investigated numerically. In order to evaluate flow structures around the building in terms of the distributions of velocity, pressure and turbulent kinetic energy, three types of RANS models including Spalart-Allmaras one-equation, transition SST four-equation and k-ω SST two-equation models were utilized for simulation. It was evidently seen from the distributions of pressure coefficient (Cp) around surfaces of the building that positive Cp value was revealed on the west-facing of the building while north-, south-, and east-facing of the building had negative Cp for all simulation cases. By the virtue of the vortex formation in the northeast of the building, after the position of x/L=0.7 there was an abrupt and steep increment in Cp while on the way to the east of the building. Furthermore, it was seen from northern facing of building that suction effect was more sensitive for transition SST turbulence model compared with the others. Besides, the local highest Cp value (west-facing) was 1.364 for Spalart-Allmaras, and the maximum local suction (north-facing) was -0.892 for transition SST. Flow recirculation zone in the east-facing part of the building was the most extended for Spalart-Allmaras compared to transition SST and k-ω SST models. Looking at the positions of the spiral nodes and saddle points, there was a distinguishable difference when Spalart-Allmaras model was compared to the other models (transition SST and k-w SST) with regard to the size of the vortex formed.

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