An analytical study of mechanisms that govern debris packing in a LWR severe accident

The paper presents physical models and numerical methods developed for simulation ofadebrisbed formation duringahypotheticalsevereaccidentinaLWR. The present approach combinesamicroscale solver based on Discrete Element Method (DEM),amultiscale treatment based on "gap-tooth" scheme anda"packinglayer" model to significantly improve computational efficiency that renders simulation of the reactor-scaledebrisbed formation possible. Numerical results are presented and discussed for test problems to characterize the performance of the proposed computational engine.

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