Author(s): Hirotake Imamoto; Taisuke Ishigaki; Koji Shiono
Linked Author(s): Taisuke Ishigaki, Koji Shiono
Keywords: No Keywords
Abstract: It is well known that secondary flow can be observed in a straight open channel, but, it is elusive to be detected because of its small magnitude and unstableness. The secondary flow is investigated experimentally or numerically by many researchers. In this paper the secondary flow is classified on the basis of its causes; velocity gap, flow boundaries and bed-generated turbulence, and discussed by using the results of 3-D LDA measurements, flow visualization in a transverse cross section and Naot-Rodi model. It is found that there are some difference between the time-mean secondary flow obtained by LDA and N-R model and the instantaneous secondary flow by the flow visualization.
Year: 1993