Fire Sci. Eng. Search

CLOSE


Fire Sci. Eng. > Volume 29(5); 2015 > Article
Fire Science and Engineering 2015;29(5):42-50.
DOI: https://doi.org/10.7731/KIFSE.2015.29.5.042    Published online October 31, 2015.
건물주위의 가스 확산사고에 대한 CFD 난류 해석기법 검토
고민욱, 오창보, 한용식, 도규형
1부경대학교 안전공학과
2부경대학교 안전공학과
3한국기계연구원 에너지플랜트안전연구실
4한국기계연구원 에너지플랜트안전연구실
Investigation of Turbulent Analysis Methods for CFD of Gas Dispersion Around a Building
Ko Min Wook, Oh Chang Bo, Han Youn Shik, Do Kyu Hyung
1Dept. of Safety Engineering, Pukyong National University
2Dept. of Safety Engineering, Pukyong National University
3Dept. of Energy Plant Safety Technology, Korea Institute of Machinery and Materials
4Dept. of Energy Plant Safety Technology, Korea Institute of Machinery and Materials
요약
도심지역을 단순 모델링한 실규모 공간에서 누출된 프로판 확산과정에 대해 대와동모사(Large Eddy Simulation: LES), 분리와동모사(Detached Eddy Simulation: DES) 및 비정상 레이놀즈평균기법(Reynolds Averaged Navier-Stokes: RANS)을 이용한 3가지 전산해석을 수행하였다. 전산해석은 FLUENT 14를 이용하였고 격자계는 ICEM-CFD를 이용하여 구성하였다. 그 결과 건물 주변의 프로판 농도분포는 주변 와구조와 밀접한 관련이 있어 이러한 와구조를 합리적으로 예측하는 정도에 따라 농도분포가 크게 차이날 수 있음을 알았다. LES와 DES는 비교적 유사한 와구조와 프로판 농도분포를 보이지만 RANS는 너무 부드러운 농도분포를 보여 복잡한 비정상적인(Unstedy) 난류 유동장을 재현하는데 한계가 있어 가스연료 누출 초기의 농도분포 전개과정을 예측하는 데에는 어려움이 있을 것으로 판단된다. 해석결과와 계산시간까지 고려한다면 DES 방법이 실규모에서의 가스연료 누출 확산과정에 대한 CFD 해석방법으로 적합할 것으로 판단된다.
Abstract
Three simulation approaches for turbulence were applied for the computation of propane dispersion in a simplified real-scale urban area with one building:, Large Eddy Simulation (LES), Detached Eddy Simulation (DES), and Unsteady Reynolds Averaged Navier-Stokes (RANS). The computations were performed using FLUENT 14, and the grid system was made with ICEM-CFD. The propane distribution depended on the prediction performance of the three simulation approaches for the eddy structure around the building. LES and DES showed relatively similar results for the eddy structure and propane distribution, while the RANS prediction of the propane distribution was unrealistic. RANS was found to be inappropriate for computation of the gas dispersion process due to poor prediction performance for the unsteady turbulence. Considering the computational results and cost, DES is believed to be the optimal choice for computation of the gas dispersion in a real-scale space.
Key Words: Propane, Gas dispersion, Large eddy simulation (LES), Detached eddy simulation (DES), Reynolds averaged navier stokes (RANS), Computational fluid dynamics (CFD)
TOOLS
Share :
Facebook Twitter Linked In Google+ Line it
METRICS Graph View
  • 0 Crossref
  •    
  • 581 View
  • 5 Download
Related articles in Fire Sci. Eng.


ABOUT
BROWSE ARTICLES
EDITORIAL POLICY
AUTHOR INFORMATION
Editorial Office
Room 906, The Korea Science Technology Center The first building, 22, Teheran-ro 7 Gil, Gangnam-gu, Seoul, Republic of Korea
Tel: +82-2-555-2450/+82-2-555-2452    Fax: +82-2-3453-5855    E-mail: kifse@hanmail.net                

Copyright © 2024 by Korean Institute of Fire Science and Engineering.

Developed in M2PI

Close layer
prev next