シュバルツ・クリストッフェル写像変換を用いた離散渦法による二次元拡大・縮小流路内のせん断流の数値解析(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
Structure and characteristics of the plane shear layers in the two-dimensional divergent or convergent duct are numerically examined by using the discrete vortex method combined with the Schwars-Cristoffel transformation. The transformation of such complicated flow configurations is successfully accomplished by introducing an original conformal mapping function. The growth rate of the shear layer is also analyzed by estimating the momentum thickness of the shear layer. It is shown that the shear layer, which is composed of a series of clusters of discrete vortices, shifts from the lower to the higher mainstream region with increasing the divergent angle of the ducts, resulting in a remarkable reduction in the lower mainstream velocity. Increasing the divergent angle of the duct increases the scale of organized eddies and therefore promotes the growth of the shear layer, whereas increasing the velocity ratio reduces the scale of organized eddies and therefore suppresses the development of the shear layer. The characteristics of the shear layer calculated show good agreement with experimental results, indicating reasonable accuracy of this numerical simulation.
一般社団法人日本機械学会の論文
2002-03-25