METHOD FOR PERFORMING TIME-EFFICIENT NUMERICAL ANALYSIS ON TWO DIMENSIONAL MODEL FOR CONVECTION AND DIFFUSION OF GAS CONCENTRATION

摘要

PURPOSE: An efficient time numerical analysis method of a 2D convection diffusion model for gas concentration is provided to limit a calculation area as a part of the whole area, thereby rapidly and accurately calculating the gas concentration. CONSTITUTION: A value applied to a variable used for a dioxide formula of a 2D convection diffusion model is inputted and initialized(S100). A convection environment is set up(S200). A calculation area in a gas concentration is expanded to the amount of expansion(S300). A numeric analysis calculation is performed for the expanded available area(S400). The available area is reduced corresponding to a calculation result(S500). [Reference numerals] (AA) Start; (BB) End; (S100) Setting an initial variable; (S200) Changing wind direction/wind speed; (S300) Area expansion step; (S310) Right direction expansion; (S320) Left direction; (S330) Upward direction expansion; (S340) Downward direction expansion; (S400) Limited area calculation; (S410) Column direction calculation; (s420) Row direction calculation; (S500) Area reduction step; (S510) Right direction reduction; (S520) Left direction reduction; (S530) Upward direction reduction; (S540) Downward direction reduction; (S600) K>final time