Generalized algebraic relation for predicting developing curved channel flow with a k-epsilon model of turbulence

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Using algebraic approximations for the Reynolds stress equations a general expression has been derived for C/sub ..mu../ in ..nu../sub t/ = C/sub ..mu../ k/sup 2//epsilon which accounts simultaneously for the effects of streamline curvature and pressure-strain in the flow, including wall-induced influences on the velocity fluctuations. The expression derived can be shown to encompass similar but more specific formulations proposed by Bradshaw, Rodi, and Leschziner and Rodi. The present formulation has been used in conjunction with k-epsilon model of turbulence to predict developing, two-dimensional, curved channel flows where both curvature and pressure-strain effects can be large. Minor modifications to include ... continued below

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Pages: 17

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Humphrey, J.A.C. & Pourahmadi, F. June 1, 1981.

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Description

Using algebraic approximations for the Reynolds stress equations a general expression has been derived for C/sub ..mu../ in ..nu../sub t/ = C/sub ..mu../ k/sup 2//epsilon which accounts simultaneously for the effects of streamline curvature and pressure-strain in the flow, including wall-induced influences on the velocity fluctuations. The expression derived can be shown to encompass similar but more specific formulations proposed by Bradshaw, Rodi, and Leschziner and Rodi. The present formulation has been used in conjunction with k-epsilon model of turbulence to predict developing, two-dimensional, curved channel flows where both curvature and pressure-strain effects can be large. Minor modifications to include the influence of curvature on the length scale of the flow near the walls produces a significant improvement in the calculations. While, in general, predictions are in good agreement with experimental measurements of mildly and strongly curved flows, the model tends to overpredict the kinetic energy of turbulence in the inner-radius (convex) wall region. This is attributed to a breakdown of the assumption that u/sub i/u/sub j/k is a constant in the derivation of the general expression for C/sub ..mu../. Most of the experimental results suggest the presence of a weak cross-stream motion due to Taylor-Goertler vortices which cannot be resolved by the calculation scheme. Despite its limitations the present formulation provides a degree of generality not previously available in two-equation modeling of turbulent flows.

Physical Description

Pages: 17

Notes

NTIS, PC A02/MF A01.

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  • 3. symposium on turbulent shear flow, Davis, CA, USA, 9 Sep 1981

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  • Other: DE81027572
  • Report No.: LBL-12009
  • Report No.: CONF-810927-1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6459288
  • Archival Resource Key: ark:/67531/metadc1211172

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • June 1, 1981

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Oct. 30, 2018, 1:09 p.m.

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Humphrey, J.A.C. & Pourahmadi, F. Generalized algebraic relation for predicting developing curved channel flow with a k-epsilon model of turbulence, article, June 1, 1981; California. (digital.library.unt.edu/ark:/67531/metadc1211172/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.