DONATE

IAHR Document Library


« Back to Library Homepage « Journal of Hydraulic Research 2010 Issue 4

Large eddy simulation of vortex flow in intake channel of hydropower facility

Author(s): Akihiko Nakayama; Nobuyuki Hisasue

Linked Author(s): Akihiko Nakayama, hisasue nobuyuki

Keywords: Free-surface vortex; HSMAC method; hydropower; intake flow; large eddy simulation

Abstract: 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.

DOI: https://doi.org/10.1080/00221686.2010.491644

Year: 2010

Copyright © 2024 International Association for Hydro-Environment Engineering and Research. All rights reserved. | Terms and Conditions