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A High-precision numerical simulation scheme for vortical flows

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

In the design study of a large-scale sodium-cooled fast reactor in Japan (JSFR), an innovative concept with a compact reactor vessel and resulting higher coolant velocity in the vessel has been examined. Such a concept may causes several thermal-hydraulics issues in the reactor vessel. One of very important issues is the cavitation phenomena due to a sub-surface vortex caused near the suction mouth of an outlet pipe. For the structural integrity, the cavitation phenomena have to be suppressed. However, the onset condition of the cavitation phenomena can not be clarified easily because the cavitation phenomena shows highly complicated behaviors associated with phase change. Therefore, the authors are developing a high-precision numerical simulation scheme for vortical flows to simulate the cavitation phenomena accurately and efficiently. In this paper, a high-precision numerical simulation scheme for vortical flows is developed and a basic verification of the scheme is conducted.

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