Turbulence characteristic of flow around a cylinder

The turbulence characteristic of flow around a cylinder positioned normal to the flow in an open channel has been investigated experimentally for two types of flow. An Acoustic Doppler Velocity Profiler was used to obtain instantaneously the three directions of the velocity in the flow. Results of the experiments show the three-dimensionality of the flow expressed by the turbulence intensities, which become very important in the zone of separation behind the cylinder. From the turbulence intensities, the turbulence kinetic energy was calculated, being small at region front of the cylinder and very high at downstream region. The Reynolds-stress components are usually very small in the close vicinity of the bed