A novel multiphase MPS algorithm for modeling crust formation by highly viscous fluid for simulating corium spreading

Guangtao Duan, Akifumi Yamaji, Seiichi Koshizuka

    Research output: Contribution to journalArticle

    Abstract

    Corium (lava-like mixture of fissile material) spreading prediction is of great significance in the severe accidents of nuclear power plants. Crust formation due to solidification distinguishes corium spreading from common isothermal spreading. The Lagrangian moving particle semi-implicit (MPS) method is potential for such spreading flow with both free surface and crust-melt interface. Crust formation is usually represented by viscosity escalation, but crust creeping is an associated problem. In the original MPS algorithm, creeping velocity cannot be reduced steadily by the continuous increase of viscosity, owing to the numerical creeping. A new solution algorithm is proposed for particle methods to eliminate such numerical creeping, so that creeping velocity decreases proportionally with viscosity rise. In this situation, high enough viscosity can effectively represent crust behaviors. Three numerical examples, leakage flow with high viscosity, dam break flow with low viscosity and the VULCANO VE-U7 corium spreading experiment with both high and low viscosities simultaneously, are investigated to contrast the performance difference between the original and new algorithms. It is demonstrated that the current algorithm is suitable for crust formation in corium spreading.

    Original languageEnglish
    Pages (from-to)218-231
    Number of pages14
    JournalNuclear Engineering and Design
    Volume343
    DOIs
    Publication statusPublished - 2019 Mar 1

    Fingerprint

    viscous fluids
    crusts
    viscosity
    Viscosity
    crust
    Fluids
    fluid
    modeling
    fissionable materials
    dams
    nuclear power plants
    lava
    solidification
    accidents
    nuclear power plant
    particle
    Dams
    Nuclear power plants
    leakage
    accident

    Keywords

    • Corium spreading
    • Crust formation
    • Fluid-solid interaction
    • MPS method
    • Numerical creeping
    • Particle method
    • Solidification

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Nuclear Energy and Engineering
    • Materials Science(all)
    • Safety, Risk, Reliability and Quality
    • Waste Management and Disposal
    • Mechanical Engineering

    Cite this

    A novel multiphase MPS algorithm for modeling crust formation by highly viscous fluid for simulating corium spreading. / Duan, Guangtao; Yamaji, Akifumi; Koshizuka, Seiichi.

    In: Nuclear Engineering and Design, Vol. 343, 01.03.2019, p. 218-231.

    Research output: Contribution to journalArticle

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