Publication

Abstract : In this paper, the results of flow visualization study and the numerical analysis on the flow around a circular cylinder with notch are presented. The notch angle is varied from 15° to 140°. All the tests are conducted in a water channel having a test section width (w) of 350 mm. Test cylinder model has a diameter of 30 mm and a depth of 180 mm. The numerical analysis is conducted using ANSYS Fluent. The Reynolds number value of 2100 is taken for both experimental and numerical analysis. Results indicate that the variation in notch angles bring notable changes in the near wake flow structures of a circular cylinder. The variation in notch angles brings considerable changes in Strouhal number and coefficient of drag. The coefficient of drag increases from 15° to 30° and then it decreases till 45°. Afterward, the Cd value shows a constant increase till 140°. Wake width and vortex formation length considerably influence the drag coefficient. In view of marine structures and building sections with similar geometry, the present study carries considerable practical significance.