The Effect of Size Ratios of the Triangular Disturbance Cylinder to the Square Cylinder to the Flow Drag of Tandem Objects

Abstract

Airflow drag from the interaction of tandem objects is one of the main factors that must be considered in the design of building and transport vehicles. In order to reduce the air flow drag, a disturbance object is usually added in front of the tandem structures. The geometry of the disturbance object that is quite good at reducing drag is a triangular cylindrical shape. The research aims to analyze the effect of the disturbance size ratio in the form of a triangular cylinder to the drag of fluid flow across square cylinders which are arranged in tandem. The methodology used in this research is experimental. The results obtained indicate that of the seven variations in the ratio of the distance M/D for d/D=0.033, d/D=0.067 and d/D=0.100, the ratio M/D=0.35 has the lowest drag coefficient value compared to the ones of other variation at the value of 0.69, while for d/D=0.67, the lowest drag coefficient is obtained at M/D=0.25, amounting to 0.67. When compared to the three variations of disturbance objects, it shows that d/D=0.067 has the lowest drag coefficient value compared to the variation of d/D=0.033 and d/D=0.100.