Author(s): M. Sanjou; I. Nezu
Linked Author(s):
Keywords: Unsteady Compound Open-Channel Flows; 3D-CFD; Turbulent Structure; Secondary Currents; Wall Shear Stress
Abstract: A lot of experimental and numerical studies have been conducted on compound open-channel flows, because they have various hydraulic functions such as water disaster prevention and valuable open-spaces for aquatic lives and ecosystems. Of particular significance is a flow-interaction between the main-channel and floodplain. However, there are few studies on depth-varying time-dependent compound open-channel flows. In the present study, 3-D time-dependent numerical model was developed involving with algebraic stress model and VOF method and applied to depth-varying unsteady compound flows. The computed values were compared with the existing experimental database by laser Doppler anemometer (LDA), and the unsteadiness properties of compound open-channel flows were examined numerically. The present numerical simulations could reproduce successfully the time-dependent profiles of wall shear stress, secondary currents, primary velocity and Reynolds stresses.
Year: 2003