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

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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 ... continued below

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10 p.

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Ventikos, Y.; Sotiropoulos, F. & Patel, V.C. December 31, 1996.

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  • Ventikos, Y.
  • Sotiropoulos, F. Georgia Institute of Technology, Atlanta, GA (United States). School of Civil and Environmental Engineering
  • Patel, V.C. Univ. of Iowa, Iowa City, IA (United States). Iowa Institute of Hydraulic Research

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Description

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.

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10 p.

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OSTI as DE98001760

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  • 18. IAHR symposium on hydraulic machinery and cavitation, Valencia (Spain), 16-19 Sep 1996

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  • Other: DE98001760
  • Report No.: CONF-9609429--1
  • Grant Number: AC07-94ID13223
  • Office of Scientific & Technical Information Report Number: 574291
  • Archival Resource Key: ark:/67531/metadc694848

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  • December 31, 1996

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • May 20, 2016, 4:28 p.m.

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Ventikos, Y.; Sotiropoulos, F. & Patel, V.C. Modelling complex draft-tube flows using near-wall turbulence closures, article, December 31, 1996; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc694848/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.