Fire evolution simulation method, and fire evacuation comprehensive simulation method comprising the same

A simulation method and fire technology, applied in the field of simulation modeling, can solve the problems of fixed fire influence range, stay, and heavy workload, and achieve the effects of improving simulation authenticity, concise program implementation, and reducing simulation errors.

Active Publication Date: 2018-11-02
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this technology are: the range of fire impact is fixed, does not change or spread over time, and cannot realize the simultaneous simulation of personnel evacuation and fire evolution
However, the disadvantage of this technology is that the fire information in the software is imported after the fire simulation software FDS simulation is completed, and the simultaneous simulation of fire evolution and pedestrian evacuation has not been realized.
This kind of operation is not only independent of each other in modeling, the workload is heavy, but also can not well reflect the dynamic impact of fire on pedestrian decision-making, and inconsistency in grid division or inconsistent step size will also lead to error

Method used

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  • Fire evolution simulation method, and fire evacuation comprehensive simulation method comprising the same
  • Fire evolution simulation method, and fire evacuation comprehensive simulation method comprising the same
  • Fire evolution simulation method, and fire evacuation comprehensive simulation method comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Fire evolution simulation case:

[0105] According to the above experimental model, a two-dimensional lattice Boltzmann model is established, such as Figure 4 As shown, the obtained model parameter information is shown in Table 1. Transformed lattice Boltzmann model system temperature T L , time t L , and the scale model system temperature T m , time t m See formula (1-1) for the relationship. According to the power curve of the fire source, the temperature of the fire source is input according to the relationship of formula (1-2).

[0106] Table 1 Calculation model information

[0107]

[0108] T L =T m , t L =2500t m (1-1)

[0109] T=3.39e-5t 3 -0.0102t 2 +1.12t+21 t∈[0,150] (1-2)

[0110] Fire evolution generally goes through three stages: development, stabilization, and decay. This paper only analyzes the development stage; for clarity, the following parameter units are described in full-scale system units. According to the definition of critical...

Embodiment 2

[0114] Examples of integrated simulation methods:

[0115] The platform of Qilizhuang Station of Beijing Subway Line 9 is a station on the second floor underground, and the platform is an island platform. The floor plan is as follows Figure 7 shown. The effective length of the platform is 118m. Excluding the equipment rooms on both sides, the length of the platform for passengers to move freely is 106m, and the effective width of the platform between the screen doors is 11.2m. In addition, there are two escalators and two steps on the platform. There is a ventilation duct interlayer on the left side of the platform.

[0116] Remove the platform structure that has little influence on the simulation results, and simplify the actual platform layout; in addition, in order to speed up the calculation speed of the program, this embodiment only establishes the left part of the platform center line for calculation. Therefore, the model is established as Figure 8 shown. The model ...

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Abstract

The invention discloses a fire evolution simulation method. The method comprises the following steps: on the basis of a lattice Boltzmann method of a mesoscopic method, establishing a two-dimensionalfire simulation model in view of fire characteristics in subway stations in combination with related theoretical methods, adding a temperature distribution function evolution equation to a basic modelof the lattice Boltzmann method to construct a dual-distribution function thermal lattice method model so as to simulate the heat transfer in the fluid; performing turbulent flow simulation by usinga large eddy simulation method, importing a sub-lattice model, reconstructing a relaxation time in the model by using physical viscosity and eddy viscosity, and constructing a lattice Boltzmann sub-lattice model; and importing a boundary processing format of obstacles in the fluid to simulate the streaming of the fluid around the obstacles; and performing solution and calculation by using a vortex restriction method to reproduce a smoke concentration diffusion process. By adoption of the method, the fire evolution simulation is optimized, the simulation validity is improved, and the simulation error is reduced. The invenetion further discloses a fire evacuation comprehensive simulation method comprising the fire evolution simulation method.

Description

technical field [0001] The invention relates to the technical field of simulation modeling, in particular to a fire evolution simulation method and a fire evacuation comprehensive simulation method including the same. Background technique [0002] The subway has developed rapidly in my country with the advantages of low consumption, safety, punctuality, and high efficiency. As a crowded public place, the subway station needs reasonable planning for emergency evacuation when a fire occurs under the pressure of a huge passenger flow. It is likely to cause serious casualties. [0003] At present, the simulation research on personnel evacuation and fire development in subway station fires at home and abroad is generally carried out separately, and the two simultaneous processes have not been comprehensively simulated, and most of the studies pay more attention to the research on personnel evacuation, which is reflected in For the improvement and development of the evacuation mod...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 王子甲陈峰朱亚迪刘海旭
Owner BEIJING JIAOTONG UNIV
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