Turbulent Flow Simulation of a Runner for Francis Hydraulic Turbines Using Pseudo-Compressibility

[+] Author and Article Information
Chuichi Arakawa

The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan

Yi Qian

Fuji Electric Co. Ltd., Kawasaki, Japan

Takashi Kubota

Kanagawa University, Yokohama, Japan

J. Fluids Eng 118(2), 285-291 (Jun 01, 1996) (7 pages) doi:10.1115/1.2817375 History: Received December 19, 1994; Revised August 09, 1995; Online December 04, 2007


A three-dimensional Navier-Stokes code with pseudo-compressibility, an implicit formulation of finite difference, and a k – ε two-equation turbulence model has been developed for the Francis hydraulic runner. The viscous flow in the rotating field can be simulated well in the design flow operating condition as well as in the off-design conditions in which a strong vortex occurs due to the separation near the leading edge. Because the code employs an implicit algorithm and a wall function near the wall, it does not require a large CPU time. It can therefore be used on a small computer such as the desk-top workstation, and is available for use as a design tool. The same kind of algorithm that is used for compressible flows has been found to be appropriate for the simulation of complex incompressible flows in the field of turbomachinery.

Copyright © 1996 by The American Society of Mechanical Engineers
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