The variation in pressure on various faces of a rectangular shaped tall building due to the presence of courtyard and opening is examined for a boundary layer flow condition corresponding to terrain category II of IS:875 (Part 3)-2015. ANSYS CFX is used for the simulation. Two turbulence models, k-and shear stress transport (SST), are used in the validation of ANSYS CFX, and the results are compared with different international standards. In the presence of courtyard and opening, interesting and unusual pressure distributions on certain faces are observed due to a self-interference effect. Flow patterns around the building for different areas of opening are also studied to explain the phenomena occurring around the building. Furthermore, the polynomial expressions for calculating force coefficients and mean pressure coefficients of each face for different angles of attack and areas of opening are proposed using least-squares regression method. Accuracy of the fitted polynomials is measured by R 2 value.
The present paper is centered on the study to understand the behavior of various surfaces of a 'Z' planshaped tall building under varying wind directions. For that purpose, computational fluid dynamics (CFD) package of ANSYS is used. The length scale is considered as 1:300. Force coefficients both in the along and across wind direction as well as the external surface pressure coefficients for different faces of the object building are determined and listed for wind incidence angle 0°-150°with increment of 30°. The wind flow pattern around the building showing flow separation characteristics and vortices are presented. The variation of wind pressure on different surfaces of the building is clearly shown by contour plots. The nature of deviation of external pressure coefficients along the height of the building as well as along the perimeter of the building for different wind angles of attack is presented. The force coefficient (C f) along the X direction is extreme for 15°wind angle and along Y direction it is maximum for 60°angle of attack. Unsteady vortices are generated in the wake region due to a combination of positive and negative pressure in the windward and leeward faces, respectively.
The present study demonstrates the pressure distribution on various faces of 'E' plan shaped tall buildings under wind excitation. Experimental and analytical studies were carried out using wind angles varying from 0° to 180° with an interval of 30°. The experimental study was conducted by open circuit boundary layer wind tunnel; whereas the analytical study was conducted with Computational Fluid Dynamics (CFD) technique using ANSYS CFX software package using k-ε turbulence model. A rigid model (made of perspex sheet) was used for wind tunnel test with a model scale of 1:300. Mean pressure coefficients of all the faces are found for all wind incidence angles and pressure contours are plotted on all the surfaces for 0° wind angles. Mean pressure coefficients are also calculated by CFD technique and the results have a good agreement with experimental results. Also, pressure contours on all the faces for a 0° wind angle are plotted and the contours are almost similar to those of experimental investigation. The flow pattern around the building model is also shown to understand the variation of pressures on different faces for a particular wind angle.
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