F211 圧力-表面張力の適切なバランスを考慮した高精度VOF法の開発と高速炉ガス巻込み現象への適用(FBR(1),OS-8 軽水炉・新型炉・核燃料サイクル(3),一般講演,地球温暖化防止と動力エネルギー技術)

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To evaluate directly gas entrainment (GE) phenomena in fast breeder reactors, we have been studied a numerical simulation method based on a highprecision volume-of-fluid (VOF) methodology. In addition, we have been employed unstructured meshes to subdivide simulation domains because exact modeling of complicated geometries in each simulation domain is a key to simulate gas entrainment phenomena accurately. Therefore, as important parts of our study, formulations of each calculation procedure in the high-precision VOF methodology on unstructured meshes are conducted in this paper. In concrete terms, calculation procedures for 1) interfacial gradient vectors, 2) interface reconstructions, 3) fluxes of volume fraction on each mesh cell face are formulated on unstructured meshes. Calculation procedures of Surface tension forces are also formulated in this paper. Then, unphysical behaviors of velocity distributions near gas-liquid interface induced by inappropriate formulation of pressure gradient are discussed and an appropriate formulation is derived considering proper balance conditions between pressure and surface tension forces. It is confirmed that this new formulation reduces the unphysical behaviors in a numerical simulation of a rising gas bubble in liquid. Finally, the basic GE experiment is simulated using our numerical simulation method. The simulation results shows that the GE phenomena occurs in the same mechanism with the experimental results.
社団法人日本機械学会の論文
2008-06-18

F211 圧力-表面張力の適切なバランスを考慮した高精度VOF法の開発と高速炉ガス巻込み現象への適用(FBR(1),OS-8 軽水炉・新型炉・核燃料サイクル(3),一般講演,地球温暖化防止と動力エネルギー技術)

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