Abstract
This study has been conducted to establish a simulation method for the natural circulation phenomena in the reactor vessel of an LMFBR. The principal results obtained in the present study are as follows: 1. (1) Two dimensionless numbers, the Gr′ number and the Bo′ number, are derived and found the most influential on the natural circulation. 2. (2) A large velocity fluctuation is observed even in the steady state as if a mean velocity field does not exist in natural circulation. 3. (3) A higher order numerical scheme seems to be appropriate to simulate natural circulation.
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