• 제목/요약/키워드: Non-orthogonal Boundary Fitted Coordinate System

검색결과 2건 처리시간 0.015초

역압력 구배가 있는 난류유동에 대한 수치적 연구 (A numerical study of turbulent flows with adverse pressure gradient)

  • 김형수;정태선;최영기
    • 대한기계학회논문집
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    • 제15권2호
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    • pp.668-676
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    • 1991
  • Turbulent flows around tube banks and in the diffuser were studied using a non-orthogonal boundary fitted coordinate system and the modified K-.epsilon. turbulence model. In these cases, many problems emerge which stem from the geometrical complexity of the flow domain and the physical complexity of turbulent flow itself. To treat the complex geometry, governing equations were reformulated in a non-orthogonal coordinate system with Cartesian velocity components and discretised by the finite volume method with a non-staggered variable arrangement. The modified K-.epsilon. model of Hanjalic and Launer was applied to solve above two cases under the condition of strong and mild pressure gradient. The results using the modified K-.epsilon. model results in both test cases.

저레이놀즈수 $k-\epsilon$ 난류모델을 사용한 엇갈린 관군 주위에서의 유동 및 열전달에 관한 연구 (A Study on the Fluid Flow and Heat Transfer Around a Staggered Tube Bundles Using a Low-Reynolds $k-\epsilon$ Turbulence Model)

  • 김형수;최영기;유홍선
    • 대한기계학회논문집
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    • 제19권1호
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    • pp.212-218
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    • 1995
  • Turbulent flow and heat transfer characteristics around staggered tube bundles were studied using a non-orthogonal boundary fitted coordinate system and the low Reynolds .kappa. - .epsilon. turbulence model suggested by Lam and Bremhorst. The predicted flow characteristics for two tube pitches and tube arrangement showed good agreement with the experimental data except the strongly curved region. The predicted Nusselt number was compared with measurements obtained in the staggered rough bundles and it revealed the similar trend to measurements, but the location of the maximum and minimum heat transfer differed somewhat from the measurements.