Unsteady Three-Dimensional Behavior of Natural Convection in Horizontal Annulus, (IV) Application of LES to Turbulent Natural Convection

Noboru Taniguchi, Yukinori Usui, Masahiro Furuya, Yasutomi Miki, Kenji Fukuda, Syu Hasegawa

Research output: Contribution to journalArticle


The large eddy simulation (LES) method is applied to turbulent natural convection in a horizontal concentric annulus. Numerical results are obtained for Rayleigh numbers based on the gap width from 2.51 ×106 to 1.18 ×109. These results are compared with other researchers' experimental data and the validity of LES is investigated. It is found that LES is very useful even if at high Ra, at which the DNS is not applicable. However, in the cases where temperature differences between cylinders are large, effect of dependency of physical properties on temperature is not negligible, which causes the poor coincidence betwenn the experiments and the numerical results.

Original languageEnglish
Pages (from-to)996-1004
Number of pages9
JournalNippon Genshiryoku Gakkaishi/Journal of the Atomic Energy Society of Japan
Issue number10
Publication statusPublished - 1992 Jan 1
Externally publishedYes



  • accuracy
  • comparative evaluations
  • concentric horizontal annulus
  • energy spectra
  • experimental data
  • finite difference method
  • large eddy simulation
  • large eddy simulation
  • Rayleigh number
  • Smagorinsky constant
  • temperature dependence
  • turbulent natural convection

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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