Buoyancy effects on the wake behind a heated obstacle immersed in a turbulent boundary layer

Y. S. Mori, Koichi Hishida, M. Maeda

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The effects of buoyancy on the wake behind a two-dimensional (2-D) heated obstacle immersed in a turbulent boundary layer have been examined both experimentally and numerically in an effort to understand the thermal release over complex terrain in an idealized environmental flow. Emphasis was placed on clarifying the modification of the production agencies of the turbulence kinetic energy, resulting both from the direct and indirect buoyant contributions. Buoyancy altered the mean velocity field along the extent of the recirculating region and resulted in a reduction of the turbulent kinetic energy in the vicinity of the obstacle and, through an enhanced shear production, a growth downstream. Buoyant production of turbulent kinetic energy dominated the shear production outside the recirculating region, where the temperature variance was significant. Numerical predictions obtained by a recent buoyancy-extended κ-ε model were found to give the analogous properties of buoyant motion appearing in the experimental results.

Original languageEnglish
Pages (from-to)405-416
Number of pages12
JournalInternational Journal of Heat and Fluid Flow
Volume16
Issue number5
DOIs
Publication statusPublished - 1995

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Keywords

  • buoyancy effects
  • forced convection
  • laser Doppler anemometer measurement
  • recirculating flow
  • two-equation model

ASJC Scopus subject areas

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

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