Studies On The Simulation Of Fire In Large Volume Building

The computer codes for the simulation of fire are currently a fundamental methodology in modern fire research. In recent years, there are a lot of activities that focus on the simulation of atrium fire, which generally integrates with experimental approaches.This dissertation has surveyed the history of fire models in the 20th century and its newly developments. Through study those commercial software of fire, this paper has developed a new fire model that has fully considered the bilateral influence of combustion and heat and mass transfer between the solid phase and the gas phase in the fire field. Later on, a comparison of the calculations from different fire models with the experimental data has been conducted. Which bring up a conclusion that the zoon model is not agree with the facts of fire experiment, hence the field model or the combined model is better for the simulation of fires in a large volume building. The author found that the stable heat source presumption or the T2 design fire is also not agree with the experimental data. The simulation of fire in an atrium has shown that the new model is more accurate to predict the fire scenarios than any other models that include a general mathematical model of fires.After analyze the foundation of the current national code ( Code for Fire Protection Design of Tall Buildings GB500045-95) through experiments and fire simulations , the author has found that there are some limitations on the use of this national code for the designing of smoke management system in an atrium. This paper has been discovered that it is not enough when using the smoke layer interface height as a criterion to make an assessment on the safety rate in a building fire, or to calculate the egress time. It should combine the data of concentration field of hazard materials in smoke to analyze the effectiveness of the smoke management system.This paper also thoroughly discussed the characters and adaptations of the scale model experiment of fires and its relationship with the fire simulation.Based on the theory of nonlinear dynamics, the author present some new ideas of the application of these theories to the simulation of authentic fire phenomenon. As anexample, the analyzing of the process of a smoldering fire change to a flame fire has been carried out, which utilize the catastrophe theory to develop a nonlinear dynamical fire model.