Gas-liquid two-phase flow simulation on unstructured adaptive mesh

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

For the purpose of direct simulations of gas entrainment (GE) phenomenon in fast reactors, we are developing a high-precision simulation algorithms for gas-liquid two-phase flows on unstructured meshes. In this study, unstructured adaptive mesh technique for gas-liquid two-phase flows is developed to reproduce local instant behaviors of interfacial dynamics. To achieve physically appropriate simulations, the volume and momentum conservative formulations are derived. The developed unstructured adaptive mesh technique is validated by simulating the slotted-disk rotation and dam-break problems. As a result, it is confirmed that the interfacial dynamic behaviors are well reproduced on the unstructured adaptive mesh.