High-precision interface reconstruction on unstructured mesh

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

For the purpose of direct simulations of gas entrainment (GE) phenomenon in fast reactors, the authors are developing a high-precision simulation algorithms for gas-liquid two-phase flows on unstructured meshes. In this study, the calculation method for interfacial gradient is improved by developing a height function algorithm which determine the interfacial gradient based on least-square concept on unstructured meshes. As a result of basic verifications, the height function algorithm succeeds in reproducing rectilinear interfaces on an unstructured triangular mesh. In addition, interfacial curvature is calculated accurately on high resolution meshes based on the height function algorithm. Therefore, it is confirmed that the developed height function algorithm can enhance the simulation accuracy of gas-liquid two-phase flows.