航空機排ガスのジェット中での拡散についてのシミュレーション

概要

論文の詳細を見る
Diffusion of a chemically inert air pollutant from a jet engine was investigated by using a Variable Glid size DuFort-Frankel Leapfrog method (VGDFL) for numerical solution to an unsteady diffusion-advection equation. For the stable solution under the jet flow field, where steep gradient of the flow velocity is observed, finer spatial grid size near the jet source was impotant not only for principal direction of the flow but also for directions perpendicular to the jet axis. Both the Dirichlet and the Robin type boundary conditions describing the jet sourse could give reasonable results. However, the Robin type (i. e., a flux type) seems more preferable since it can provide a "gridaveraged" source condition, which gives correct evalution of the total mass injected into the calculation region, with relative case. The VGDFL was more economical in computation cost compared with the usual DuFort-Frankel Leapfrog method, due to its ability of reducing number of grid in a region far from the jet source.
日本シミュレーション学会の論文
1990-03-15