Investigation of flow characteristics around in-line horizontal cylinders in shallow water

The aim of this thesis is to investigate the flow characteristics around in-line horizontal cylinders using two dimensional Particle Image Velocimetry (PIV) technique in shallow water. Experiments were undertaken in a water channel in Fluid Mechanics Laboratory, Mechanical Engineering Department of Cukurova University. The effect of gap between two horizontal cylinders on flow characteristics was investigated. Moreover, the effect of submergence of the horizontal cylinders in shallow water was investigated. All experiments were carried out fully developed shallow flow conditions. The free stream velocity was U=167 mm/sec, which represented a value of Reynolds number based on cylinder diameter of ReD= 5000. The observation showed that the second cylinder attenuate size of the wake region for L/D=0 case. The wake region clearly occurs between cylinders beginning of L/D=1 case. As the gap between cylinders rises, size of the wake region increases. Keywords: Shallow water, Horizontal cylinders, Vorticity, In-line, In tandem arrangement