Numerical simulation of self-leveling behavior in debris bed by a hybrid method

Liancheng Guo, Koji Morita, Hirotaka Tagami, Yoshiharu Tobita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The postulated core disruptive accidents (CDAs) are regarded as particular difficulties in the safety analysis of liquid-metal fast reactors (LMFRs). In the CDAs, the self-leveling behavior of debris bed is a crucial issue to the relocation of molten core and heat-removal capability of the debris bed. The fast reactor safety analysis code, SIMMER-III, which is a 2D, multi-velocity-field, multiphase, multicomponent, Eulerian, fluid dynamics code coupled with a fuel-pin model and a space- and energy-dependent neutron kinetics model, was successfully applied to a series of CDA assessments. However, strong interactions among rich solid particles as well as particle characteristics in multiphase flows were not taken into consideration for fluid-dynamics models of SIMMER-III. In this article, a developed hybrid method, by coupling the discrete element method (DEM) with the multi-fluid model of SIMMER-III, is applied in the numerical simulation of self-leveling behavior in debris bed. In the coupling algorithm, the motions of gas and liquid phases are solved by a time-factorization (time-splitting) method. For particles, contact forces among particles and interactions between particles and fluid phases are considered through DEM. The applicability of the method in such complicate three phase flow is validated by taking the simulation of a simplified self-leveling experiment in literature. Reasonable agreement between simulation results and corresponding experimental data shows that the present method could provide a promising means for the analysis of self-leveling behavior of debris bed in CDAs.

Original languageEnglish
Title of host publicationNuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume3
ISBN (Print)9780791855805
DOIs
Publication statusPublished - 2013
Event2013 21st International Conference on Nuclear Engineering, ICONE 2013 - Chengdu, China
Duration: Jul 29 2013Aug 2 2013

Other

Other2013 21st International Conference on Nuclear Engineering, ICONE 2013
CountryChina
CityChengdu
Period7/29/138/2/13

Fingerprint

Core disruptive accidents
Debris
Fast reactors
Computer simulation
Fluid dynamics
Finite difference method
Relocation
Fluids
Particle interactions
Multiphase flow
Factorization
Liquid metals
Molten materials
Dynamic models
Neutrons
Kinetics
Liquids
Gases
Experiments

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

Cite this

Guo, L., Morita, K., Tagami, H., & Tobita, Y. (2013). Numerical simulation of self-leveling behavior in debris bed by a hybrid method. In Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes (Vol. 3). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/ICONE21-15483

Numerical simulation of self-leveling behavior in debris bed by a hybrid method. / Guo, Liancheng; Morita, Koji; Tagami, Hirotaka; Tobita, Yoshiharu.

Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes. Vol. 3 American Society of Mechanical Engineers (ASME), 2013.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Guo, L, Morita, K, Tagami, H & Tobita, Y 2013, Numerical simulation of self-leveling behavior in debris bed by a hybrid method. in Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes. vol. 3, American Society of Mechanical Engineers (ASME), 2013 21st International Conference on Nuclear Engineering, ICONE 2013, Chengdu, China, 7/29/13. https://doi.org/10.1115/ICONE21-15483
Guo L, Morita K, Tagami H, Tobita Y. Numerical simulation of self-leveling behavior in debris bed by a hybrid method. In Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes. Vol. 3. American Society of Mechanical Engineers (ASME). 2013 https://doi.org/10.1115/ICONE21-15483
Guo, Liancheng ; Morita, Koji ; Tagami, Hirotaka ; Tobita, Yoshiharu. / Numerical simulation of self-leveling behavior in debris bed by a hybrid method. Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes. Vol. 3 American Society of Mechanical Engineers (ASME), 2013.
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