非構造格子系における高精度気液界面勾配計算法

High-precision calculation of interface normal on non-orthogonal mesh

伊藤 啓; 功刀 資彰*; 大島 宏之

Ito, Kei; Kunugi, Tomoaki*; Ohshima, Hiroyuki

高速炉ガス巻込み現象の直接解析を目的として、著者らは高精度気液二相流数値解析手法の開発を行っている。本論文では、非構造格子系における高さ関数法を開発することによって気液界面勾配の計算手法を改良し、基礎検証によって直線界面の再現に成功するとともに、界面局率の計算も高精度化できたことを示す。

For the purpose of direct simulations of gas entrainment phenomenon in fast reactors, the authors are developing a high-precision simulation algorithm for gas-liquid two-phase flows on non-orthogonal meshes. In this paper, the calculation method for an interface normal is improved by developing a height function algorithm on non-orthogonal meshes. As a result of basic verification, the height function algorithm succeeds in reproducing rectilinear interfaces on a non-orthogonal triangular mesh. In addition, an interfacial curvature is calculated accurately based on the interface normal calculated by the height function algorithm.