2023ICERD8-C39 -- Laminar Flow Across Tandem-Manipulated Surface Cylinders: Effect of Reynolds Number and Groove Location

Controlling the flow between two tandem circular cylinders is a key issue in many engineering applications. This article presents numerical investigations of laminar flow regimes (Re between 50 and 200) Over two tandem cylinders. A groove was created on the surface of the upstream cylinder, leaving the downstream cylinder with a smooth surface. The effect of the groove orientation angle with respect to the stagnation point was investigated. The results indicated that the pressure and consequently the imposed forces on the cylinders’ surface alter due to the alteration of the wake between and aft the two cylinders as a consequence of the groove orientation. A significant change is found for the lift and drag coefficients of the cylinders. Furthermore, it is found that as Re increases, three distinguished flow regimes known as reattachment flow (Re = 50 to 75), transition flow (Re = 75 to 100), and coshedding flow (Re =100 to 200), are formed for the two tandem cylinders as a result of the groove.