Evaluation of a Large Eddy Simulation on Thermal Boundary Condition in Underground Car Park

Authors

  • Ahmad Faiz Tharima Fire and Rescue Department of Malaysia, Lebuh Wawasan Presint 7, 62250 Putrajaya, Malaysia
  • Mohd Zamri Yusoff College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang Selangor, Malaysia
  • Md Mujibur Rahman College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang Selangor, Malaysia

Keywords:

adiabatic, critical velocity, underground car park

Abstract

Both Fire Dynamic Simulator (FDS) and Smokeview (SMV) were adopted to predict the heat distribution and the smoke propagation. The data are important for determining the required tenability limit in an underground car park during fire. The credibility of FDS result depends heavily on the numerical setting and the imposed boundary conditions. The present study explored the influence of different thermal boundary conditions, i.e. adiabatic and constant wall temperature boundary conditions. The grid independent Heat Release Rate (HRR) and the vertical temperature profiles on some selected locations were firstly obtained. It was found that the R 2 of the constant temperature thermal boundary condition was the highest (89.4%). Meanwhile, the R 2 of the adiabatic thermal boundary condition was 87.5%. Therefore, the constant wall temperature boundary condition was adopted for subsequent analysis. On the other hand, the temperature distribution was dependent on the imposed thermal boundary condition as well. For adiabatic condition, the smoke took lesser time to reach the floor. However, for constant temperature boundary condition, the smoke layer remained at the upper level and the smoke concentration was low near the end wall. Also, the predicted critical velocity for the case of constant temperature boundary condition was much lower than that of adiabatic boundary condition. In general, lower critical velocity indicates that the hot gases would reside at the upper level longer.

Downloads

Published

2020-12-01

How to Cite

Tharima, A. F. ., Yusoff, M. Z. ., & Rahman, M. M. . (2020). Evaluation of a Large Eddy Simulation on Thermal Boundary Condition in Underground Car Park. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 48(1), 17–24. Retrieved from https://akademiabaru.com/submit/index.php/arfmts/article/view/2256

Issue

Section

Articles