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Yang P.,Shanghai JiaoTong University | Tan X.,Shanghai Fire Bureau | Sun H.,Heihe University | Chen D.,Shanghai JiaoTong University | Li C.,Shanghai JiaoTong University
Fire Safety Journal | Year: 2013

One of the objectives of fire accident reconstruction is to determine the cause of the fire and to examine the fire spread. The temperature and extent of fire damage are the two most important characteristics in a fire accident. They can be fully utilized in a fire accident simulation that is based on a Large Eddy Simulation (LES) field model, which has been widely used as a simulation model for fire analysis. However, since it needs many simulation runs using this model in fire accident reconstruction, it will increase the reconstruction time and cost. The use of an Orthogonal Experimental Design (OED) method as a tool to reduce the simulation runs in fire accident reconstruction is proposed. An orthogonal array is selected on a discrete design space and levels are chosen from candidate values. Matrix experiments with the orthogonal array are conducted and a range difference analysis is used to find out the optimum levels. The method is applied to a fire experiment as a validation. The numerical and experimental results fit very well. © 2013 Elsevier Ltd.


Yao G.,Shanghai JiaoTong University | Yang P.,Shanghai JiaoTong University | Tan X.,Shanghai Fire Bureau
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2015

A method based on LES and linear programming was proposed for the numerical construction of fire accident. In the simulation with LES method, all the quantities were decomposed into large-scale components and small-scale components. For large-scale components, the direct simulation method was used. For small-scale components, the subgrid model was used. The LES method could improve the simulation accuracy. In the linear programming method, the parameters were locally linearized to solve the optimization problem. It could improve the simulation efficiency. The method was applied to the numerical reconstruction of a wholesale market fire in Shanghai. The spread of fire and smoke was analyzed. The simulation results agree well with the fire reconnaissance data, which validates the proposed method. ©, 2015, Chinese Association for System Simulation. All right reserved.


Yang P.,Shanghai JiaoTong University | Yao G.,Shanghai JiaoTong University | Tan X.,Shanghai Fire Bureau
Tunnelling and Underground Space Technology | Year: 2015

The carbon black trace is an important characteristic in a building fire accident and becomes crucial evidence in fire investigation. Based on the particle deposition theory, the mathematical model is established for the carbon black trace in a building fire. The numerical model of the carbon black trace is implemented into the Fire Dynamics Simulator (FDS) software. The total mass of the carbon black particle deposited on the wall surface can be calculated quantitatively and be simulated visually. The proposed model is applied into a fire accident as a validation. A numerical model is used to simulate the fire accident. In numerical simulations, the grid size resolution is analyzed. The accident reconnaissance data, accident interview record and accident scene photo/video are compared with the results of numerical simulations. It shows that the simulation results have a good agreement with those in the fire accident, which validates the mathematical model in this study. The proposed method can provide useful data for fire reconstruction and fire investigation. © 2015 Elsevier Ltd.


Yang P.,Shanghai JiaoTong University | Tan X.,Shanghai Fire Bureau | Sun H.,Heihe University | Chen D.,Shanghai JiaoTong University | Li C.,Shanghai JiaoTong University
Advances in Engineering Software | Year: 2011

The main objective of fire accident reconstruction is to determine the fire source and find out the fire spread. The temperature and the fire spread mark are the most important information in a fire accident, the information can be fully utilized based on Large Eddy Simulation (LES) field model, which has been widely used as simulation model for fire analyses. However, this model is not popular in fire accident reconstruction because it needs lots of simulation runs, which increases the reconstruction time and cost. The use of orthogonal experimental design (OED) method as a tool to reduce the simulation runs in fire accident reconstruction is proposed in this research. An orthogonal array is selected on a discrete design space and levels are chosen from candidate values. Matrix experiments with the orthogonal array are conducted and range difference analysis is used to find out the optimum levels. The method proposed in this research is applied to a typical house fire accident as a validation. A group of optimum levels was obtained and the corresponding simulation was studied. The reconstruction results can provide a scientific foundation for accident judgements. © 2011 Elsevier Ltd. All rights reserved.


Yang P.,Shanghai JiaoTong University | Tan X.,Shanghai Fire Bureau | Xin W.,Shanghai JiaoTong University
Building and Environment | Year: 2011

Full-scale experiment and numerical simulations are carried out on a shelf fire in a storehouse to study the ignition manner, the fire spread and the combustion characteristics. A computational fluid dynamics (CFD) model of fire-driven fluid flow, FDS (Fire Dynamics Simulator), is used to solve numerically a form of the Navier-Stokes equations for fire. Ignition manner experiments with both cigarette ends and lighter are conducted first. Then a full-scale experiment on a shelf fire is performed. The temperatures are measured and the fire growth and spread process is analyzed. A numerical model is used to simulate the experiment; the temperatures, fire growth and heat release rate are studied. In numerical simulations, the grid size resolution is analyzed. The experimental results of temperatures and the fire growth and spread process are compared with the results of numerical simulations. It shows that the numerical results are in good agreement with the experimental results. The chimney effect is also observed in both the experiment and the simulation. These useful data can be helpful in the numerical reconstruction of the whole storehouse fire accident. © 2011 Elsevier Ltd.

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