T. Uchiyama,∗ H. Yagami,∗∗ and M. Sugiyama∗∗
Vortex method, diffusion of matter, point-source plume diffusion field
This paper is concerned with the numerical simulation for a point- source plume diffusion field of matter upstream of, around and behind a circular cylinder in turbulent flow. The simulation employs the particle method, in which the velocity field is calculated by a vortex method and the concentration field is computed by a method analogous to the vortex method. The diffusing matter is entrained into the Karman vortices and exhibits meandering behaviour in ac- cordance with the experiment. The mean and fluctuation concentra- tions are in good agreement with the measurement, demonstrating that the particle method has a high applicability to the analysis of diffusion of matter around an obstacle in free turbulent flow.
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