Numerical modeling of floating bodies transport for flooding analysis in nuclear reactor building

Wang, Zidi; Hu, Fangyuan; Duan, Guangtao; Shibata, Kazuya; Koshizuka, Seiichi

doi:10.1016/j.nucengdes.2018.11.031

Cited by 31 publications

(3 citation statements)

References 24 publications

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“…36 The flood and resulting submersion, spray, water pressure, wave impact, and high-temperature steam have the potential to threaten the reliability of many SSCs. Wang et al 37 evaluated flood propagation and its impact on floating bodies in the layout of AP1000. Wells et al 38 performed fragility experiments and probabilistic modeling of full-scale interior doors against flood pressure.…”

Section: Flooding Eventmentioning

confidence: 99%

Simulation-based dynamic probabilistic risk assessment of an internal flooding-initiated accident in nuclear power plant using THALES2 and RAPID

Kubo

Zheng

Tanaka

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part O:

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Probabilistic risk assessment (PRA) is a method used to assess the risks associated with large and complex systems. However, the timing at which nuclear power plant structures, systems, and components are damaged is difficult to handle explicitly if the risk of an external event is evaluated using conventional PRA based on event trees and fault trees. A methodology coupling thermal-hydraulic analysis with external event simulations using Risk Assessment with Plant Interactive Dynamics (RAPID) is therefore proposed to overcome this limitation. A flood propagation model based on Bernoulli’s theorem was applied to represent internal flooding in the turbine building of the pressurized water reactor. Uncertainties were also taken into account, including the flow rate of the floodwater source and the failure criteria for the mitigation systems. The simulated recovery actions included the operator isolating the floodwater source and using a drainage pump; these actions were modeled using several simplifications. Overall, the results indicate that combining isolation and drainage can reduce the conditional core damage probability upon the occurrence of flooding by approximately 90%.

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Section: Flooding Eventmentioning

confidence: 99%

Simulation-based dynamic probabilistic risk assessment of an internal flooding-initiated accident in nuclear power plant using THALES2 and RAPID

Kubo

Zheng

Tanaka

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part O:

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“…They divided the computation space into multiple small spaces in order to make the simulation run in parallel [32]. Wang et al [33] simulated floating bodies transported by fluid using the MPS method and the PMS model for an incompressible fluid and the interaction of rigid bodies and fluid, as well as the discrete element method for explicitly calculated inter-rigid-body contacts. In the MPS method, the pressure of a fluid is implicitly computed by solving the pressure Poisson equation and thus the pressure field of rigid bodies in the PMS method is implicitly calculated along with that of the fluid when this method is used in combination with the MPS method.…”

Section: Introductionmentioning

confidence: 99%

Strongly coupled simulation of incompressible fluid and rigid bodies with velocity-based constraints using particle method

Miyamoto¹,

Koshizuka²

2023

Preprint

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This paper presents a novel particle method to compute strongly coupled incompressible fluid and rigid bodies. The method adopts a velocity-based formulation and utilizes the linear complementarity problem for the incompressibility constraint. Since all the constraints for incompressibility, inter-rigid-body contacts, and interaction between incompressible fluid and rigid bodies are mathematically compatible, strongly coupled simulation is achieved using the method, where the shapes of the rigid bodies are represented by particles as well. The abstract concept of velocity-based constraints is presented, which generalizes the formulations of the incompressibility constraint and inter-rigid-body contacts and provides a generic way to achieve strongly coupled simulation. Several numerical examples are presented to verify the method, which includes rigid-body computation, hydrostatic pressure, dam-break computation, and circular parch computation for incompressible fluid, buoyancy and seesaw computation for interaction of incompressible fluid and rigid bodies, and complex-scene computation for overall behavior and stability.

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“…The Lagrangian meshfree particle methods, including smoothed particle hydrodynamics (SPH) 1 and moving particle semi-implicit (MPS) 2 methods, have great advantages in simulating complicated interfacial flows. During recent years, the particle methods have been used to simulate free surface flow (eg, dam break, 2,3 sloshing, 4 waves, 5,6 and droplet deformation 7,8 ), multiphase flow (eg, gas-liquid, [9][10][11][12] liquid-liquid [13][14][15] flows) and fluid-solid interaction flow (eg, fluid-rigid- [16][17][18][19][20][21][22] and fluid-elastic-structure 23,24 interactions). Meanwhile, the accuracy and stability of particle methods have been remarkably improved to enhance the reliability.…”

Section: Introductionmentioning

confidence: 99%

Imposing accurate wall boundary conditions in corrective‐matrix‐based moving particle semi‐implicit method for free surface flow

Duan

Matsunaga

Yamaji

et al. 2020

Numerical Methods in Fluids

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Corrective matrix that is derived to restore consistency of discretization schemes can significantly enhance accuracy for the inside particles in the Moving Particle Semi-implicit method. In this situation, the error due to free surface and wall boundaries becomes dominant. Based on the recent study on Neumann boundary condition (Matsunaga et al, CMAME, 2020), the corrective matrix schemes in MPS are generalized to straightforwardly and accurately impose Neumann boundary condition. However, the new schemes can still easily trigger instability at free surface because of the biased error caused by the incomplete/biased neighbor support. Therefore, the existing stable schemes based on virtual particles and conservative gradient models are applied to free surface and nearby particles to produce a stable transitional layer at free surface. The new corrective matrix schemes are only applied to the particles under the stable transitional layer for improving the wall boundary conditions. Three numerical examples of free surface flows demonstrate that the proposed method can help to reduce the pressure/velocity fluctuations and hence enhance accuracy further.

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Numerical modeling of floating bodies transport for flooding analysis in nuclear reactor building

Cited by 31 publications

References 24 publications

Simulation-based dynamic probabilistic risk assessment of an internal flooding-initiated accident in nuclear power plant using THALES2 and RAPID

Simulation-based dynamic probabilistic risk assessment of an internal flooding-initiated accident in nuclear power plant using THALES2 and RAPID

Strongly coupled simulation of incompressible fluid and rigid bodies with velocity-based constraints using particle method

Imposing accurate wall boundary conditions in corrective‐matrix‐based moving particle semi‐implicit method for free surface flow

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