Simulation of large-scale forest fire parameters

Abstract

Topicality. There is an urgent need to select the main energy, geometric and thermophysical parameters of forest fires, as well as to assess the main parameters of these fires, including unexplored fire tornadoes and wave processes caused by fires. Purpose. To develop mathematical models of physical processes caused by large-scale forest fires, evaluate the main parameters of these fires, including unexplored fire tornadoes and wave processes caused by fires. Methods. Analytical review of the research problem, theoretical and computational, mathematical modeling, systematic analysis of the set of physical effects. Results. The results of the analysis of the parameters of forest fires and related physical processes caused by large-scale fires are presented. The main energy, geometric and thermophysical parameters of large-scale forest fires are proposed. These include: energy, power, duration, area of fires, as well as the length, intensity and speed of the combustion front, heat flux density, power flux density, torch height, heat and smoke rise height, convection speed, etc. Simple analytical physical and mathematical models of the main parameters of large-scale forest fires have been created. A model of a fiery tornado is proposed. The obtained ratios allow us to estimate the main parameters of fire tornadoes that accompany large-scale forest fires. These include radius, angular velocity, tangential velocity, maximum height and rate of rise of the heated formation. It is shown that, depending on the size of the vortex, the parameters of the fiery tornado vary widely. These relationships make it possible to analyze and evaluate the main parameters of wave processes generated by forest fires. Such parameters are energy, relative share of energy, range of periods of acoustic radiation, etc. The main parameters of forest fires and related physical processes are calculated. It is shown that depending on the area of the fire, these parameters vary widely. Conclusions. Mathematical models of physical processes caused by large-scale forest fires have been developed, by means of which the parameters of the main effects have been calculated.

Keywords

• large-scale forest fire
• energy parameters
• geometrical parameters
• thermophysical parameters
• fire tornado
• thermal rise height
• convection velocity
• acoustic radiation