高精度気液二相流数値解析手法の検証

Verification of a high-precision numerical method for interfacial flows

伊藤 啓; 功刀 資彰*; 大野 修司  ; 河村 拓己*

Ito, Kei; Kunugi, Tomoaki*; Ohno, Shuji; Kawamura, Takumi*

原子炉内の複雑気液二相流現象を高精度に評価することを目的として、界面追跡法に基づく数値解析手法の開発・検証を進めている。本件では、新たに開発した手法の検証として界面変形を伴う流れ場の数値解析を行った結果について報告する。

The method of manufactured solution (MS) is well known as a verification method of numerical simulation algorithms. In this study, the authors develop a new MS with dynamic interfacial deformation due to a vortex, which is a simplified model of the gas entrainment (GE) behavior in sodium-cooled fast reactors and is necessary for the verification of a high-precision numerical method developed for the simulation of the GE. The MS is considered on an axisymmetric system and radial, circumferential and axial velocities and pressure are formulated to satisfy the continuity equation and the boundary condition on an interface. Preliminary calculations are performed on five meshes with various resolutions and the calculation error decreases with mesh resolution. Such an appropriate result implies the developed MS is a good problem to verify the high-precision numerical method.