Experimental and numerical investigation of velocities under steady and unsteady flow conditions

In this study, velocity distribution in open channel flows was investigated experimentally and numerically under steady and unsteady flow conditions. The experiments were carried out in a channel which was available in the Hydraulics Laboratory of Civil Engineering Department in Dokuz Eylul University. The velocity measurements were conducted by using UVP (Ultrasonic Velocity Profiler) and ADV (Acoustic Doppler Velocimeter) devices. The velocity profiles under steady flow conditions were also obtained by means of UVP device and compared with those computed by using the equations available in the literature. According to the results it was observed that the Power Law and Parabolic Law are compatible in the outer region of the flow and the Logarithmic Law is compatible in the inner region of the flow. Temporal variation of the point velocities were measured by using ADV and UVP devices under unsteady flow conditions and it was observed that the obtained time dependent velocity measurements were consistent. Flow3D software was used for numerical analysis and the numerical results were compared with the experimental findings.