低Re応力方程式モデルの三次元U字管内乱流熱伝達場での性能(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
This paper presents discussions on predicting turbulence and heat transfer in complicated flow fields by recent low-Reynolds-number (LRN) second moment closures. The flow fields discussed are two types of square sectioned U-bend duct flows with mild and strong curvature. The strain fields are complex and thus so are the heat transfer characteristics. A version of the Two-Component-Limit (TCL) second moment closure and Shima's "wall-reflection free" model are presently focused on. They are LRN models totally free from geometrical parameters. For turbulent heat flux, the higher order version of the generalized gradient diffusion hypothesis is applied along with the TCL model. The results are compared with those of the nonlinear cubic κ-ε-A_2 eddy viscosity model. It is concluded that in the case of mild curvature, both second moment closures are generally good enough for predicting flow and heat transfer though they are not more attractive than the κ-ε-A_2 model. However, in the strong curvature case, only the TCL model gives reliable heat transfer prediction.
一般社団法人日本機械学会の論文
2002-11-25