2010/08/01 by Akihiko Nakayama, Nobuyuki Hisasue
Engineering · #Fluid Dynamics and Turbulent Flows #Fluid Dynamics and Vibration Analysis #Hydraulic flow and structures
paper · doi:10.1080/00221686.2010.491644
crossref issued 2010/08/01 · crossref published 2010/08/01 · crossref published-print 2010/08/01 · openalex publication_date 2010/08/01 · crossref published-online 2010/09/08 · crossref created 2010/09/12 · openalex created_date 2025/10/10 · crossref deposited 2026/01/29 · crossref indexed 2026/07/30 · openalex updated_date 2026/07/30
Three-dimensional unsteady flow in the intake channel of a small-scale hydroelectric power facility has been simulated numerically using a large eddy simulation technique. The basic numerical method is the highly simplified MAC iteration method modified for the free-surface flow. The standard Smagorinsky model with near-wall damping and correction for irrotational strain was used to evaluate the sub-grid scale stresses. Using the numerical grid that marginally resolves the near-wall flow of laboratory-scale Reynolds number, the complex and unsteady nature of the vortical flow can be reproduced well. The free-surface depression associated with the formation of a free-surface vortex and its time development, which have so far been difficult to be reproduced numerically, are particularly well captured. The present study shows that this method is relevant for predicting the intake flows with possible air entrainment.