Numerical simulation method for diffusion of biochemical gas in subway station and emergency plan generation system

The invention discloses a numerical simulation method for diffusion of biochemical gas in a subway station and an emergency plan generation system.The numerical simulation method for diffusion of biochemical gas in the subway station comprises the steps that a three-dimensional simulation model of the subway station is established, a constant flux boundary is set, finite element numerical difference processing is carried out, and therefore grids are generated; establishing an initial boundary value condition of fluid dynamic numerical solution, and solving a kinetic equation of corresponding three-dimensional space refined air flow to obtain an air flow field in the subway station; and based on the generated grid and an air flow field in the subway station, solving diffusion state parameters after biochemical gas leakage, completing simulation of the whole diffusion process after the biochemical gas in the subway station is released, and obtaining a simulation result. According to the invention, high-precisio