Fire Science and Engineering (한국화재소방학회논문지)

Korean Institute of Fire Science and Engineering (한국화재소방학회)
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Analysis of Prediction Results and Grid Size Dependence According to Changes in Fire Area

화원면적 변화에 따른 격자 크기 의존도 및 예측결과 분석

  • 윤홍석 (대전대학교 대학원 방재학과) ;
  • 황철홍 (대전대학교 소방방재학과)
  • Received : 2019.10.18
  • Accepted : 2019.11.19
  • Published : 2019.12.31
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Abstract

In fire simulations for building fire safety evaluation, changes in the fire area and grid size can significantly influence the prediction results. Therefore, the effects of area changes of the fire source with identical maximum heat release rates on the prediction results of a compartment fire were investigated. The dependence of the prediction results on the grid size using the identical fire area was also examined. No significant changes were observed in the thermal and chemical characteristics of the fires with variable grid sizes, even though the fire area was changed when six or more grids were set based on the fire diameter. In addition, changes in the fire area caused significant differences in the prediction of major physical quantities associated with available safety egress time (ASET) within a compartment. However, the fire area changes did not considerably influence the overall fire characteristics outside the compartment after reaching a certain distance from the opening.

건축물의 화재안전성평가를 위한 화재시뮬레이션에서 화원면적 및 격자크기의 변화는 예측결과에 큰 영향을 미칠 수 있다. 따라서 동일한 최대 열발생률을 갖는 화원의 면적 변화가 구획화재의 예측결과에 미치는 영향이 검토되었으며, 동일한 화원면적의 조건에서 격자크기에 대한 예측결과의 의존도가 동시에 검토되었다. 주요 결과로서, 특성화재직경을 기준으로 6개 이상의 격자가 삽입되면 화원면적이 변화되더라도 격자크기는 화재의 열 및 화학적 특성에 큰 영향을 미치지 않았다. 또한 화원면적의 변화는 구획 내부에서 허용피난시간(ASET)과 관련된 주요 물리량의 예측결과에 상당한 차이를 야기하였다. 그러나 개구부를 기준으로 일정 거리 이상의 구획외부에서는 화원면적의 변화가 전반적 화재특성에 미치는 영향이 크지 않음이 확인되었다.

Keywords

References

  1. K. McGrattan, R. McDermott, C. Weinschernk, K. Overholt, S. Hostikka and J. Floyd, "Fire Dynamics Simulator, User's Guide", NIST SP 1019, Sixth Edition, NIST, Gaithersburg, MD (2017).
  2. H. S. Yun, D. G. Nam and C. H. Hwang, "A Numerical Study on the Effect of Volume Change in a Closed Compartment on Maximum Heat Release Rate", Journal of Korean Institute of Fire Science and Engineering, Vol. 31, No. 5, pp. 19-27 (2017). https://doi.org/10.7731/KIFSE.2017.31.3.019
  3. W. Jahn, G. Rein and J. L. Torero, "The Effect of Model Parameters on the Simulation of Fire Dymamics", Fire Safety Science 9th International Symposium, pp. 1341-1352 (2008).
  4. S. M. Lee, "A Study on the Appropriateness of Design Fire Size Determining for Performance Based Design in Korea", Fire Science and Engineering, Vol. 28, No. 4, pp. 50-56 (2014). https://doi.org/10.7731/KIFSE.2014.28.4.050
  5. H. Y. Jang and D. G. Nam, "Measurements of the Heat Release Rate and Fire Growth Rate of Combustibles for the Performance-Based Design - Focusing on the Plastic Fire of Commercial Building", Fire Science and Engineering, Vol. 32, No. 6, pp. 55-62 (2018). https://doi.org/10.7731/KIFSE.2018.32.6.055
  6. D. G. Nam and C. H. Hwang, "Measurement of the Heat Release Rate and Fire Growth Rate of Combustibles for the Performance-Based Design - Focusing on the Combustibles in Residential and Office Spaces", Fire Science and Engineering, Vol. 31, No. 2, pp. 29-36 (2017).
  7. S. G. Kang, D. E. Kim, D. G. Seo, D. J. Kim, J. H. Kim and Y. J. Kwon, "A Study on the Experimental to Establish Combustion Properties DB Accordance to Vehicle Model Categorizes at Parking Space", Journal of Korean Society of Hazard Mitigation, Vol. 14, No. 1, pp. 27-33 (2014). https://doi.org/10.9798/KOSHAM.2014.14.1.27
  8. D. Yung, "Small-scale Compartment Fire Experiments with PMMA Cribs", Fire Safety Journal, Vol. 17, No. 4, pp. 301-313 (1991). https://doi.org/10.1016/0379-7112(91)90025-T
  9. G. Hadjisophocleous and E. Zalok, "Development of Design Fires for Performance-Based Fire Safety Designs", Fire Safety Science 9th International Symposium, pp. 63-78 (2008).
  10. Ministry of Business, Innovation & Employment, "CV/M2 Verification Method: Framework for Fire Safety Design - Fore New Zealand Building Code Clauses C1-C6 Protection from Fire", New Zealand (2014).
  11. C. Fleischmann, "Defining the Heat Release Rate per Unit Area for use in Fire Safety Engineering Analysis", Proceedings of the 10th AOSFST, pp. 419-426 (2017).
  12. NRC and EPRI, "Verification and Validation of Selected Fire Models for Nuclear Power Plant Applications", NUREG-1824 and EPRI 1011999, Final Report (2007).
  13. K. McGrattan, S. Hostikka, R. McDermott, J. Floyd, C. Weinschenk and K. Overholt, "Fire Dynamic Simulator Technical Reference Guide, Volume 3: Validation", NIST SP 1018-3, Sixth Edition, NIST, Gaithersburg, MD (2015).
  14. K. McGrattan, J. Floyd, G. Forney and H. Baum, "Improved Radiation and Combustion Routines for a Large Eddy Simulation Fire Model", Fire Safety Science 7th International Symposium, pp. 827-838 (2003).
  15. P. J. DiNenno, D. Drysdale, C. L. Beyler, W. D. Walton, L. P. Richard, J. R. Hall and J. M. Watts, "SFPE Hand Book of Fire Protection Engineering (Third Edition)", National Fire Protection Association, Society of Fire Protection Engineers (2002).
  16. S. C. Kim, "Effect of the Characteristic Length Scale on the Grid Dependency of FDS Model", Proceedings of 2012 Spring Annual Conference, Fire Science & Engineering, pp. 66-69 (2012).
  17. S. H. An, S. Y. Mun, I. H. Ryu, J. H. Choi and C. H. Hwang, "Analysis on the Implementation Status of Domestic PBD (Performance Based Design) - Focusing on the Fire Scenario and Simulation", Journal of the Korean Society of Safety, Vol. 32, No. 5, pp. 32-40 (2017). https://doi.org/10.14346/JKOSOS.2017.32.5.32
  18. S. Y. Mun and C. H. Hwang, "Performance Evaluation of FDS for Predicting the Unsteady Fire Characteristics in a Semi-Closed ISO 9705 Room", Journal of Korean Institute of Fire Science & Engineering, Vol. 26, No. 3, pp. 21-28 (2012).
  19. C. H. Hwang, A. Lock, M. Bundy, E. Johnsson and G. H. Ko, "Effects of Fuel Location and Distribution on Full-Scale Underventilated Compartment Fires", Fire Science and Engineering, Vol. 29, No. 1, pp. 21-52 (2011). https://doi.org/10.1177/0734904110372119
  20. H. S. Han and C. H. Hwang, "Study on the Available Safe Egress Time (ASET) Considering the Input Parameters and Model Uncertainties in Fire Simulation", Fire Science and Engineering, Vol. 33, No. 3, pp. 112-120 (2019). https://doi.org/10.7731/KIFSE.2019.33.3.112