On the weak-equilibrium condition for derivation of algebraic heat flux model

J. F. Qiu, S. Obi, T. B. Gatski

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4 Citations (Scopus)

Abstract

Analogous to an algebraic Reynolds stress model, the algebraic heat flux model (AHFM) is derived from a second-moment closure by invoking the weak-equilibrium condition. The present study investigates this condition in detail as it applies to the advection and diffusive-transport terms. For the advection term, the correct form of this condition in non-inertial frames is obtained by means of an invariant Euclidean transformation. The validity of the diffusive-transport condition is examined through an a priori test using a DNS database for rotating turbulent channel flow with heat transfer. It is shown that the weak-equilibrium condition applied to diffusive-transport term tends to fail in the near-wall region. An alternative form is proposed that is based on an asymptotic analysis of the transport equation budget in the near-wall region. An evaluation of proposed form shows that it has the potential to improve the predictive ability of an ARSM for flows involving system rotation and/or streamline curvature.

Original languageEnglish
Pages (from-to)1628-1637
Number of pages10
JournalInternational Journal of Heat and Fluid Flow
Volume29
Issue number6
DOIs
Publication statusPublished - 2008 Dec 1

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Keywords

  • AHFM
  • Diffusive-transport constraint
  • Euclidean invariant
  • Evaluation
  • Weak-equilibrium condition

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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