Browsing by Author "Biswas, Nripendranath"

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    Aerodynamic Characteristics and Flow Patterns of Square Cylinders with Rounded Facets
    (Research and Development Wing, MIST, 2025-06) Biswas, Nripendranath
    This study experimentally investigates the effect of facet widthon the static pressure distribution around a single square cylinder with rounded facets. Experiments are conducted in an open-circuit wind tunnel at a Reynolds number of 5.4 × 10⁴, based on the side dimension of the cylinder subjected to a uniform flow velocity of 13.6 m/s. Five different dimensionless facet widthsare systematically introduced to assess their influence on pressure distribution at varyinganglesof attack. Static pressure measurements are collected around the perimeter of the cylinder, and the resulting data are processed through numerical integration to determine the corresponding drag coefficients. The results demonstrate that incorporating facets significantly modifies the aerodynamic characteristics of the cylinder by reducing the drag coefficient comparedto that of a sharp-edged configuration. The drag reduction is primarily attributed to delayed flow separation and a decreasein the size of the wake region. However, beyond a critical facet width, further increases produce only marginal improvements, indicating the presence of an optimal range for facet dimensions. This research demonstrates that facet modification is an effective and practical approach for controlling aerodynamic drag in bluff bodies. The findings offer valuable insights for optimizing structural designs subjected to wind loads, highlighting potential applications in civil engineering fields such as building design, bridge construction, and tower development. By deepening the understanding of how minor geometric alterations can impact flow behaviour, this work contributes to the development of safer, more efficient, and aerodynamically stable structures exposed to atmospheric winds.
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    Experimental investigation of wind load on tall buildings with square cross-section having rounded facet
    (2008-01) Biswas, Nripendranath; Mandal, Dr.A.C.
    An experimental investigation of the static pressure distribution on the. square cylinders with rounded facet is conducted. The study includes both the single cylinder and the group consisting of two cylinders. The test is conducted in open circuit wind tunnel at a Reynolds number 5.4 x 104 based on the face length across the flow with uniforrh flow of velocity 13.6 m/s. The study is conducted, initially on a single cylinder with various facet widths at zero angle of attack. The five different dimensionless facet widths are considered in the study with a view to observing the effect of the facet widths on the static pressure distribution. Then a group of cylinders is taken into consideration for the study. Each group consists of two cylinders; one in front of the other is kept along the flow direction. The static pressure distribution is monitored on each cylinder in the group varying the inter spacing between the front and the rear cylinder. The drag coefficient is determined from the static pressure distributions by the numerical integration method. It is observed from the results that the drag coefficient depends on the facet widths significantly. With the facet widths on the cylinder, the drag reduces remarkably compared to that on the sharp edged cylinders. However, with further increase of facet widths, drag does not change significantly.