Modelling complex draft-tube flows using near-wall turbulence closures
- Georgia Institute of Technology, Atlanta, GA (United States). School of Civil and Environmental Engineering
- Univ. of Iowa, Iowa City, IA (United States). Iowa Institute of Hydraulic Research
This paper presents a finite-volume method for simulating flows through complex hydroturbine draft-tube configurations using near-wall turbulence closures. The method employs the artificial-compressibility pressure-velocity coupling approach in conjunction with multigrid acceleration for fast convergence on very fine grids. Calculations are carried out for a draft tube with two downstream piers on a computational mesh consisting of 1.2x10{sup 6} nodes. Comparisons of the computed results with measurements demonstrate the ability of the method to capture most experimental trends with reasonable accuracy. Calculated three-dimensional particle traces reveal very complex flow features in the vicinity of the piers, including horse-shoe longitudinal vortices and and regions of flow reversal.
- Research Organization:
- Lockheed Idaho Technologies Co., Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
- DOE Contract Number:
- AC07-94ID13223
- OSTI ID:
- 574291
- Report Number(s):
- CONF-9609429-1; ON: DE98001760; TRN: 98:001212
- Resource Relation:
- Conference: 18. IAHR symposium on hydraulic machinery and cavitation, Valencia (Spain), 16-19 Sep 1996; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Observations of Velocity Conditions near a Hydroelectric Turbine Draft Tube Exit using ADCP Measurements
Steady state RANS simulations of temperature fluctuations in single phase turbulent mixing