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

  • 제30권10호
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  • Pages.966-972
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  • 2006
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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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원형 단면을 갖는 180° 굽은 곡관내 발달하는 난류유동에 관한 수치해석

Numerical Simulation of Developing Turbulent Flow in a Circular Pipe of 180° Bend

  • 명현국 (국민대학교 기계자동차공학부)
  • 발행 : 2006.10.01
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초록

A numerical simulation is performed fur developing turbulent flow in a strongly curved 180 deg pipe and its downstream tangent by a new solution code(PowerCFD) which adopts an unstructured cell-centered method. The governing equations are discretized as the full elliptic from of the equations of motion. Three typical two-equation turbulence models of low-Reynolds-number form are used to approximate the turbulent stress field. Solutions fur both streamwise and circumferential velocity components are compared with the experimental data by Azzola et at.(1986). The ${\kappa}-{\omega}$ model by Wilcox(1988) is found to give better prediction performance than the other two. Predicted secondary velocities and streamwise velocity component contours at sequential longitudinal stations are also presented in order to enable a detailed description of the complete flow. It is also found that, in the bend both mean streamwise and secondary velocities never achieve a fully-developed state and the code is capable of producing very well the complex nature of steady flow in a strongly curved pipe.

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참고문헌

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