한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
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환기가 있는 터널에서의 화재유동 해석의 정확성에 대한 고찰

THE EXAMINATION OF ACCURACY OF FIRE-DRIVEN FLOW SIMULATION IN TUNNEL EQUIPPED WITH VENTILATION

  • 장용준 (한국철도기술연구소 철도환경연구실) ;
  • 이창현 (한국철도기술연구소 철도환경연구실) ;
  • 김학범 (한국철도기술연구소 철도환경연구실) ;
  • 정우성 (한국철도기술연구소 철도환경연구실)
  • 발행 : 2009.09.30
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초록

Numerical methods are applied to simulate the smoke behavior in a ventilated tunnel using large eddy simulation (LES) which is incorporated in FDS (Fire Dynamics Simulator) with proper combustion and radiation model. In this study, present numerical results are compared with data obtained from experiments on pool fires in a ventilated tunnel. The model tunnel is $182m(L){\times}5.4m(W){\times}2.4m(H)$. Two fire scenarios with different ventilation rates are considered with two different fire strengths. The present results are analyzed with those from LES without combustion and radiation model and from RANS ($\kappa-\epsilon$) model as well. Temperature distributions caused by fire in tunnel are compared with each other. It is found that thermal stratification and smoke back-layer can be predicted by FDS and the temperature predictions by FDS show better results than LES without combustion and radiation model. The FDS solver, however, failed to predict correct flow pattern when the high ventilation rate is considered in tunnel because of the defects in the tunnel-inlet turbulence and the near-wall turbulence.

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참고문헌

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