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

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...

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 errors or even errors in the results

[0008] 2. Emphasis is placed on the improvement of the personnel evacuation model while ignoring the construction of the fire smoke diffusion model

Most of the simulation methods are based on the improvement and development of the existing models from the perspective of the personnel evacuation model. For the smoke diffusion simulation data, it is only obtained through the simulation of the existing software, and even a fixed position and a fixed range are used to simulate the impact of the fire. Facilitates a substantial fusion of the two simulations

This is also the fundamental reason why most of the research only stays at the independent stage of personnel evacuation simulation and fire smoke simulation.

Images