非構造格子系における界面体積追跡法の検討

摘要

There are several methods of tracking gas-liquid interface of multi-phase flows (MF). In these methods, the MARS (Multi-interfaces Advection and Reconstruction Solver) developed by one of the authors has been successfully applied to many problems, because of the accurate volume/mass conservation of fluid. But the MARS was developed on a structured gird system, and it is difficult to get the results with high accuracy for the complex geometry of the solution domain. On the other hand, the usage of an unstructured grid system in the computational fluid dynamics is now to be a popular manner for handling the complex geometry of the computational domain. In the present stydy, we have developed an interface-volume tracking algorithm on the unstructured grid system for the MF numerical simulation based on the MARS. This paper describes the interface-volume tracking procedure based on the MARS for the unstructured grid system, and discusses on the accuracy of the reconstruction of the interfaces and also discusses on the conservation of the volume of fluid through the advection process.%気液二相流は気体と液体が混在する流れであり，沸rn騰水型原子炉，ボイラー等伝熱装置，化学工学機器なrnど幅広い分野で利用されている．その数値解析手法とrnして，例えば原子炉内サブチャンネル解析などでは流rnれ場に出現する様々な混相流動場を流動様式に分類し，rn各流動様式に対する基礎的な実験で得られた実験相関rn式を「構成方程式」の形で空間平均された混相流運動rn方程式に取り込むことで数値解析モデルを構築していrnる．