A High-precision unstructured adaptive mesh technique for gas-liquid two-phase flows

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

In this paper, a high-precision unstructured adaptive mesh technique for gas-liquid two-phase flows is developed and verified/validated. In the unstructured adaptive mesh technique, the PLIC algorithm is employed to simulate interfacial dynamic behaviors and, therefore, the reconstruction method for the interfaces in refined cells is developed, which satisfies the gas and liquid volume conservations and geometrical conservations of interfaces. In addition, the physics-based consideration is performed on the momentum calculations near interfaces, and the calculation method with gas and liquid momentum conservations is developed. For verification, the slotted-disk revolution problem is solved and the unstructured adaptive mesh technique succeeds in reproducing the slotted-disk shape accurately. The dam-break problem is also simulated and the momentum conservative calculation method succeeds in providing physically appropriate results, which show good agreements with experimental data.