自由噴流の３次元直接数値計算と実験値による検証

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  • 湯 晋一
    九州工業大学工学部 設計生産工学科機械工学教室
  • 川関 義雄
    九州工業大学工学部 設計生産工学科機械工学教室
  • 永末 剛
    九州工業大学工学部 設計生産工学科機械工学教室

書誌事項

タイトル別名
  • Direct Numerical Simulation of Three-Dimensional Navier Stokes Equations for Free Jet and Experimental Verification.
  • ジユウ フンリュウ ノ 3ジゲン チョクセツ スウチ ケイサン ト ジッケンチ

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The third-order upwind finite difference scheme is used for the convective terms in Navier Stokes equations to simulate directly the air free jet flow issuing from a round nozzle. The simulation was carried out for flow fields ranging from initial region to fully developed turbulent region. The kinetic energy conservation scheme is used for the convective terms. The mesh width is roughly seven times Kolmogorov microscale, but the calculated results of mean velocity distributions and turbulence characteristics (turbulent intensity distributions, Reynolds stress, power spectra, and velocity autocorrelations) fairly well represent the experimental data. The calculated power spectra of the turbulence intensity and the autocorrelations are also compared with experimental ones. The comparison shows fairly good agreement with experimental data for large-scale eddies of sizes larger than twice the mesh width. This indicates that the simulation well represents the motion of large-scale eddies which play an important role in a flow field formation, and suggests that neglecting the small-scale eddies in the third-order upwind finite difference scheme does not greatly affect the simulation of large-scale eddies.

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