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Numerical simulation of cavitation by sub-surface vortex; High-precision numerical simulation scheme for vertical flow

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

The cavitation due to sub-surface vortex, which can damage structural surfaces of a large-scale sodium-cooled fast reactor in Japan, have been studied. The authors are developing a CFD code to simulate the cavitation accurately. In this paper, as the first part of the development, a high-precision simulation scheme for vortical flows is presented. In this scheme, a vortical flow is identified in each cell and a vortical velocity distribution is determined locally to be consistent with the local velocity distribution. Then, the calculations of momentum transport through cell faces are performed in consideration with the vortical velocity distribution. As a fundamental verification of the developed scheme, inviscid vortex attenuation in two-dimensional domain is simulated. As a result, it is confirmed that the developed scheme can simulate vortical flows more accurately than conventional schemes.

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