Understanding the ex-vessel spreading behavior of molten core materials (corium) on reactor containment floor is great importance for designing, managing, and evaluating severe accidents light water reactors. Among some simulated corium experiments, temporal termination restart flow (stop-and-go) were highlighted in ECOKATS-V1 experiment, which simulant oxide melt (consisted 41% Al2O3, 24% SiO2...

The onsite investigations of Fukushima Daiichi Nuclear Power Plant (1F) Units-2 and 3 indicate possibilities multiple breaches the Reactor Pressure Vessels (RPVs). In meantime, some analytical works that core materials 1F were once relocated to lower plenum RPVs cooled (quenched) before water inventory boiled-off (dry out) once-cooled debris re-melted. This study utilizes Lagrangian-based Movin...

• Unstable pressure computation investigated from a totally new viewpoint of particle-level contact/collisions. Proposition correction based on momentum conservation collisions. New stable source terms are derived for Poisson equation (PPE), mitigating oscillations in wider range time and spatial resolutions. Very simple implementation no additional computational effort, which desirable practic...

Computer graphics and virtual reality technologies have enables us to develop several medical systems such as preoperative planning, intra-operative navigation and surgical simulation systems. The training for each part of human bodies is available, which parts are head, eye, liver, bone and so on; however, real-time simulation of blood vessel deformation or bleeding is not available with the p...

This paper develops a consistent particle method for capturing the highly non-linear behavior of violent free-surface flows, based on an Enhanced Weakly Compressible Moving Particle Semi-implicit (EWC-MPS) method. It pays special attention to evaluation and improvement two regularization techniques, namely, pairwise collision (PC) shifting (PS). To improve effectiveness PC in removing noisy pre...

This paper proposes and validates two new particle regularization techniques for the Smoothed Particle Hydrodynamics (SPH) numerical method to improve its stability accuracy free surface flow simulations. We introduce a general form of Dynamic pair-wise Collision (DPC) technique that we recently proposed in context Moving Semi-implicit (MPS) [1]. The DPC coupled with standard Shifting (PS) has ...