Research And Implementation Of Simulation Technology Of Smoke Diffusion In The Building

Owing to the great destructive power and certain hazards of fire,it is difficult for people to analyze and predict the diffusion process of fire and smoke indoors.Therefore,by simulating the direction and concentration of smoke in a specific environment,not only can it display the smoke diffusion process dynamically,but also it can reflect the changes in smoke concentration in different spaces.Accordingly,it is helpful for the researcher to grasp the changing trend of smoke in the fire field clearly and it is of great practical significance for guiding fire safety and firefighting.The paper proposes a smoke diffusion model based on boundary constraints for the the interior space which have complex boundary conditions and fixed space,and then the paper designs and implements a realistic indoor smoke diffusion simulation system,which can be able to simulate the direction and concentration of smoke flowing in the building.The specific contribution of this article is as follows.First of all,for most of the current smoke simulation methods are limited to the simulation of smoke itself,the diffusion of smoke in a specific scene is rarely considered and the simulation details of the smoke diffusion are not deep enough and other issues,the paper is based on analysis and summarization previous physical models of smoke diffusion,and proposes a smoke diffusion model based on boundary constraints,which can make up for the external forces and constraints that were ignored by previous smoke models.Afterwards,in view of the complexity of solving partial differential equations which is difficult to obtain exact solutions,the paper uses finite difference method to solve the established model and focuses on the analysis of the newly introduced wind force,air resistance and diffusion force in the smoke diffusion model,and the process of solving external force equations after adding these factors.At the same time,taking into account the limitations of indoor boundary conditions,the paper combines the Dirichlet condition with the Neumann condition,after each time step,not only is the velocity at the boundary updated,but also physical quantities such as density,temperature,and pressure at the boundary are processed accordingly.During the solution process,the path of smoke after it hits the wall needs to be taken into account,at the same time,the path of smoke encountering obstacles in the building is reckoned with.According to the spatial position of the boundary elements in the interior mesh model,the boundary elements are divided into three categories,and the physical quantities of the three boundary elements are solved respectively.Finally,the paper designs and implements a realistic interior smoke diffusion simulation system.It designs the overall framework and functional modules of the system,and implements the interior smoke diffusion simulation system.Then,it explains the main flow of the system and the drawing method of interior smoke in detail.The diffusion effect of smoke in different interior scenes is simulated by experiments,and the experimental results are analyzed to verify the rationality of the proposed model and the solution method.