Towards the development of a Reynolds-averaged algebraic turbulent scalar-flux model

K. Abe, K. Suga

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

In order to derive a possible direction for developing Reynolds-averaged algebraic turbulent scalar-flux models, a priori explorations are attempted by processing the LES data presently performed for channel flows under several flow-boundary conditions including shear-free boundaries. The present calibration has elucidated that the turbulent scalar-flux vectors obtainable from the simple generalized gradient-diffusion hypothesis (GGDH) hardly align with the simulation results in wall-shear flows at Pr≥0.71. However, the GGDH form returns a quite reasonable approximation in shear-free flow regions and/or lower Pr fluid cases. In the former flow cases, it has been found that an introduction of quadratic products of the Reynolds-stress tensor into the gradient diffusion model may improve the predictive performance.

Original languageEnglish
Pages (from-to)19-29
Number of pages11
JournalInternational Journal of Heat and Fluid Flow
Volume22
Issue number1
DOIs
Publication statusPublished - Feb 2001

All Science Journal Classification (ASJC) codes

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

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