Abstract
For the evaluation of gas entrainment phenomena in the sodium-cooled fast reactor (JSFR), a high-precision simulation method for gas-liquid two-phase flows on unstructured meshes have been developed. In this study, our high-precision volume-of-fluid algorithm on unstructured meshes is introduced into the two-dimensional unstructured adaptive mesh algorithm (described in the 1st report). For that purpose, an appropriate redistribution method for volume fraction values is established. In addition, a calculation procedure is formulated, in which momentum values at both gas and liquid phases are conserved respectively when velocity values at refined or merged cells are calculated. This new unstructured adaptive mesh algorithm for gas-liquid two-phase flows is verified by solving well-known slotted disk rotation problems. As a result, the present adaptive mesh algorithm succeeds in maintaining slotted disk shape after one rotation by relatively small number of cells. In addition, the dam break problem is also simulated. The simulation results showed that the gas-liquid interface is simulated with high resolution and the transient interfacial position is more accurate than the simulation result on the non-adaptive mesh.
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