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Title: Modelling complex draft-tube flows using near-wall turbulence closures

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.
Authors:
;  [1] ;  [2]
  1. Georgia Institute of Technology, Atlanta, GA (United States). School of Civil and Environmental Engineering
  2. Univ. of Iowa, Iowa City, IA (United States). Iowa Institute of Hydraulic Research
Publication Date:
OSTI Identifier:
574291
Report Number(s):
CONF-9609429--1
ON: DE98001760; TRN: 98:001212
DOE Contract Number:
AC07-94ID13223
Resource Type:
Conference
Resource Relation:
Conference: 18. IAHR symposium on hydraulic machinery and cavitation, Valencia (Spain), 16-19 Sep 1996; Other Information: PBD: 1996
Research Org:
Lockheed Idaho Technologies Co., Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; TURBULENT FLOW; MESH GENERATION; FLOW MODELS; DRIFT TUBES; HYDRAULIC TURBINES; NAVIER-STOKES EQUATIONS; NUMERICAL SOLUTION