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Report No.
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Development of numerical method for simulation of gas entrainment phenomena

Ito, Kei; Yamamoto, Yoshinobu*; Kunugi, Tomoaki*

For the purpose of direct numerical simulations of gas entrainment in fast breeder reactors, we are developing a high-precision seamless physical simulator based on computational scientific approaches. An unstructured mesh partitioning method was employed in this study and a high-precision calculation method for gas-liquid two-phase flow on the unstructured mesh was developed on the basis of the MARS formulated on a structured mesh. As the result of the verification, it was confirmed that the developed method has comparable or higher calculation accuracy compared to conventional methods. In addition, a correction method was introduced to the advection term of the volume fraction transport equation to improve volume conservation. The correction method led higher calculation accuracy on the unstructured mesh compared to the original method. Errors in a surface tension calculation were also estimated and the reconstructed distance function method showed the most accurate result.

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