Numerical Simulation of Scalar Fluctuation Field in a Non-Buoyant Plume by Random Fourier Modes.

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  • ランダムフーリエモード法によるプルーム変動スカラー場の数値シミュレーション
  • ランダムフーリエモードホウ ニ ヨル プルーム ヘンドウ スカラージョウ ノ スウチ シミュレーション

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Abstract

A new Lagrangian numerical simulation technique to calculate concentration fluctuation fields by a non-buoyant plume in grid generated turbulence has been developed. Lagrangian velocities of the fluid particles in the downstream decaying turbulence are simulated by the summation of unsteady random Fourier modes. Then, the backward diffusion technique of particle-pair is applied to the prediction of scalar statistics. Simulations of two types of scalar fluctuation fields (of a point source plume and of a line source plume in a grid-generated turbulence) have been made and the simulation results are compared with the experimental data. As a whole, the pressent new model gives good predictions of the actual scalar fluctuation statistics in both cases, although near the line source there still exists some inevitable deviation caused by meandering effect between simulation and experimental results.

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