DENSITY DISTRIBUTION ANALYSIS DEVICE AND DENSITY DISTRIBUTION ANALYSIS METHOD

PROBLEM TO BE SOLVED: To provide a technology for quickly outputting highly accurate density distribution under the consideration of the influence of the fluctuation of a flow by using a particle tracking method in the case of analyzing a diffusion phenomenon under such an environment that a flow largely fluctuates.SOLUTION: A density distribution analysis device 10 configured to simulate a diffusion substance by a plurality of particles includes: a fluid calculation part 12 for calculating at least the flow velocity and turbulent flow energy distribution of fluid with respect to an analysis mesh on the basis of an initial parameter applied from an input part 11 by applying a numerical analysis method; a particle tracking part 13 for searching the locus of the particles in an area as an object of analysis and the spread of density around the particles on the basis of the calculated flow velocity and turbulent flow energy distribution of the fluid; and a density distribution calculation part 14 for calculating the density distribution of the diffusion substance in the analysis mesh under the consideration of the fluctuation influence of the flow of the fluid for the density distribution obtained by integrating the influences from the respective particles on the basis of the flow velocity distribution of the fluid, the positions of the particles, and the spread of the density around the particles.