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BACKWARD-FACING STEP FLOW BETWEEN STEP-SIDE STATIONARY AND MOVING WALLS

Yohei Morinishi
Graduate School of Engineering Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan

Abstrakt

Turbulent flows over a backward-facing step in a channel between the step-side stationary and the moving walls have been studied experimentally. Three non-dimensional parameters that specify the flow condition are the channel expansion ratio (ER), the Reynolds number (Reτ0), and the flow type parameter (β0, non-dimensionalized pressure gradient). In this study, the channel expansion ratio and the Reynolds number are fixed at ER = 1.5 and at Reτ0 = 300, respectively, in order to explore the effect of the pressure gradient on the velocity profile. With the hot-wire measurement, the profiles of mean velocity and fluctuation intensity have been analyzed. The logarithmic and the half-power laws for the mean velocity have been detected in the redevelopment region.