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Numerical Analysis of Fragmentation Mechanisms in Vapor Explosions by Seiichi Koshizuka; Hirokazu Ikeda; Yoshiaki Oka is a Engineering article available to read on EtoBox.

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Fragmentation of molten metal is the key process in vapor explosions. However, this process is so rapid that the mechanisms have not yet been clarified in experimental studies. In addition, numerical simulation is difficult because we have to analyze water, steam and molten metal simultaneously with boiling and fragmentation. The authors have been developing a new numerical method, the moving particle semi-implicit (MPS) method, based on moving particles and their interactions. Grids are not necessary. Incompressible flows with fragmentation on free surfaces have been calculated successfully using the MPS method. In the present study, numerical simulation of the fragmentation processes using the MPS method is carried out to investigate the mechanisms. A numerical model to calculate boiling from water to steam is developed. In this model, new particles are generated on water -steam interfaces. A two-step pressure calculation algorithm is also developed. Pressure fields are separately calculated in both heavy and light fluids to maintain numerical stability with the water and steam system. The new model and algorithm are added to the MPS code. Water jet impingement on a molten tin po

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Author

Seiichi Koshizuka; Hirokazu Ikeda; Yoshiaki Oka

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0029-5493)

Published

1999

Language

EN

Field

Engineering (Physical Sciences)