A non-linear algebraic model for the turbulent scalar fluxes

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The need for a new approach to modelling the scalar fluxes stems from the lack of realism in the performance of the simple gradient-transport models and the inadequacy of many of the assumptions underlying the more complicated scalar-flux transport closures. The problems with the simple gradient-transport closures are well known. In models of this type, the scalar fluxes are related to the mean scalar field via a scalar turbulent diffusivity. The purpose of this paper is to report on a novel approach to the modelling of the turbulent scalar fluxes (u{sub i}{theta}) which arise as a consequence of time averaging ... continued below

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12 p.

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Younis, B.A.; Speziale, C.G. & Clark, T.T. September 1, 1995.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 19 times . More information about this article can be viewed below.

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  • Younis, B.A. City Univ., London (United Kingdom). Dept. of Civil Engineering
  • Speziale, C.G. Boston Univ., Massachusetts (United States). Dept. of Aerospace and Mechanical Engineering
  • Clark, T.T. Los Alamos National Lab., NM (United States)

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Description

The need for a new approach to modelling the scalar fluxes stems from the lack of realism in the performance of the simple gradient-transport models and the inadequacy of many of the assumptions underlying the more complicated scalar-flux transport closures. The problems with the simple gradient-transport closures are well known. In models of this type, the scalar fluxes are related to the mean scalar field via a scalar turbulent diffusivity. The purpose of this paper is to report on a novel approach to the modelling of the turbulent scalar fluxes (u{sub i}{theta}) which arise as a consequence of time averaging the transport equation for a mean scalar ({Theta}). The focus of this paper will be on the case where {Theta} is a `passive` scalar; the extension of this approach to cases involving buoyancy and compressibility will be briefly discussed. Models of this type fail badly in complex and strongly-buoyant flows.

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12 p.

Notes

OSTI as DE96000063

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  • International conference on turbulent heat transfer, San Diego, CA (United States), 10-15 Mar 1996

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  • Other: DE96000063
  • Report No.: LA-UR--95-3148
  • Report No.: CONF-960351--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 183903
  • Archival Resource Key: ark:/67531/metadc669698

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  • September 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Aug. 8, 2016, 8:53 p.m.

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Younis, B.A.; Speziale, C.G. & Clark, T.T. A non-linear algebraic model for the turbulent scalar fluxes, article, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc669698/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.