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Report No.
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Development and verification of unstructured adaptive mesh technique with edge compatibility

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

In a design study of the large-sized sodium-cooled fast reactors in Japan, one key issue to establish an economically superior design is the suppression of a gas entrainment phenomenon (GE). Therefore, we are developing a high-precision CFD method to evaluate the GE phenomenon accurately. In this study, as one part of the development, a two-dimensional unstructured adaptive mesh technique is developed and verified. In the two-dimensional unstructured adaptive mesh technique, each cell is isotropically subdivided to reduce distortions of cells. In addition, a connection cell is formed to eliminate the edge incompatibility between refined and non-refined cells. Finally, the present unstructured adaptive mesh technique is verified by solving well-known driven cavity problem and as a result, the present unstructured adaptive mesh technique succeeds in providing a high-precision solution with less number of cells than the structured mesh.

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