12. Power Spectral Density on Principal Building Due to Setback Interfering Building

The problem of getting living and working spaces is increasing with the rise in human population. To minimize the effects of this problem, modern technology introduces tall buildings. Wind-based structural analysis of tall buildings helps us to build tall structures keeping them safe. Interference effect is one such important wind phenomenon, which affects the structure greatly. That is why the need of the study on interference effect is so significant these days. In this study, two virtual building models are used. The principal one is a square-plan tall building, and the interfering one is a setback tall building, which is placed in front of the principal building obstructing a time bound wind flow of a gust lasting for 3 s. This particular study offers power spectral density (PSD) variation with respect to Strouhal number for top near corner target points at a level of 0.975h on each surface of the principal model as well as the streamline variation in the altitude level of 0.475h. All the variations are obtained due to the positional changes of the interfering building, as it is rotated about its own axis with an interval of 15° from 0° to 90°. The maximum PSD value is obtained for 15° orientation of the interfering building from the windward face of the principal building. For the 90° orientation of the interfering building, the PSD values obtained from leeward and side faces of the principal building are nearly same.