Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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TURBULENT FLOW CHARACTERISTICS OF CHANNEL FLOW USING LARGE EDDY SIMULATION WITH WALL-FUNCTION(FDS CODE)

벽 함수가 적용된 대와류 모사(FDS 코드)의 채널에서의 난류 유동 특성

  • Jang, Yong-Jun (Railroad Safety and Certification Center, Korea Railroad Research Institute) ;
  • Ryu, Ji-Min (Railroad Safety and Certification Center, Korea Railroad Research Institute) ;
  • Ko, Han Seo (Heat & Mass Control Laboratory, School of Mechanical Engineering, SungKyunKwan University) ;
  • Park, Sung-Huk (Railroad Safety and Certification Center, Korea Railroad Research Institute) ;
  • Koo, Dong-Hoe (Railroad Safety and Certification Center, Korea Railroad Research Institute)
  • 장용준 (한국철도기술연구원 철도안전인증센터) ;
  • 류지민 (한국철도기술연구원 철도안전인증센터) ;
  • 고한서 (성균관대학교 기계공학부 열 및 물질 제어연구실) ;
  • 박성혁 (한국철도기술연구원 철도안전인증센터) ;
  • 구동회 (한국철도기술연구원 철도안전인증센터)
  • Received : 2015.08.17
  • Accepted : 2015.09.01
  • Published : 2015.09.30
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Abstract

The turbulent flow characteristics in the channel flow are investigated using large eddy simulation(LES) of FDS code, built in NIST(USA), in which the near-wall flow is solved by Werner-Wengle wall function. The periodic flow condition is applied in streamwise direction to get the fully developed turbulent flow and symmetric condition is applied in lateral direction. The height of the channel is H=1m, and the length of the channel is 6H, and the lateral length is H. The total grid is $32{\times}32{\times}32$ and $y^+$ is kept above 11 to fulfill the near-wall flow requirement. The Smagorinsky model is used to solve the sub-grid scale stress. Smagorinsky constant $C_s$ is 0.2(default in FDS). Three cases of Reynolds number(10,700, 26,000, 49,000.), based on the channel height, are analyzed. The simulated results are compared with direct numerical simulation(DNS) and particle image velocimetry(PIV) experimental data. The linear low-Re eddy viscosity model of Launder & Sharma and non-linear low-Re eddy viscosity model of Abe-Jang-Leschziner are utilized to compare the results with LES of FDS. Reynolds normal stresses, Reynolds shear stresses, turbulent kinetic energys and mean velocity flows are well compared with DNS and PIV data.

Keywords

References

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