대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제24권2호
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  • Pages.316-323
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  • 2000
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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난류박리 및 재부착 유동에 대한 저레이놀즈수 비선형 열전달 모형의 개발

A Non-linear Low-Reynolds-Number Heat Transfer Model for Turbulent Separated and Reattaching Flows

  • 리광훈 (한국과학기술원 기계공학과) ;
  • 성형진 (한국과학기술원 기계공학과)
  • 발행 : 2000.02.01
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⟨ 이전 논문 다음 논문 ⟩

초록

A nonlinear low-Reynolds-number heat transfer model is developed to predict turbulent flow and heat transfer in separated and reattaching flows. The $k-{\varepsilon}-f_{\mu}$ model of Park and Sung (1997) is extended to a nonlinear formulation, based on the nonlinear model of Gatski and Speziale (1993). The limiting near-wall behavior is resolved by solving the $f_{\mu}$ elliptic relaxation equation. An improved explicit algebraic heat transfer model is proposed, which is achieved by applying a matrix inversion. The scalar heat fluxes are not aligned with the mean temperature gradients in separated and reattaching flows; a full diffusivity tensor model is required. The near-wall asymptotic behavior is incorporated into the $f_{\lambda}$ function in conjunction with the $f_{\mu}$ elliptic relaxation equation. Predictions of the present model are cross-checked with existing measurements and DNS data. The model preformance is shown to be satisfactory.

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참고문헌

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