Experimental investigation of turbulent flow past four grooved and smooth cylinders in an in-line square arrangement

Abstract

Abstract. An experimental study of turbulent flow past four cylinders in square arrangement with a space ratio of (T/D = P/D = 2.88) is performed. The investigation focuses on effects of Reynolds number and the shape of cylinders on the force and pressure coefficients of the cylinders. Two cases are investigated: four smooth cylinders (case1) and four grooved cylinders (case2). The cylinders are equipped with two grooves placed on the external surface at 90° and 270° degrees. The pressure distributions along the tubes (22 circumferential pressure taping) were determined for a variation of the azimuthal angle from 0 to 360deg.The drag and lift forces are measured using the TE 44 balance. The results show a bistable flow often exists behind the downstream cylinders is observed. By rising the Reynolds number the pressure coefficient increases in the absolute value.

Computational fluid dynamics modeling patterns and force characteristics of flow over in-line four square cylinders

“…Drag and lift coefficients were measured by using an open-jet wind tunnel with Re = 30000 and four equally-spaced cylinders. An experimental study of turbulent flow past four cylinders in a square arrangement with equal space ratios (L/D = 2.88) was performed by Ladjedel et al [12]. Four smooth cylinders and four grooved cylinders were investigated.…”