Numerical investigation of fluid–solid interaction during debris bed formation based on MPS-DEM

Ding, Wen; Xiao, Xinkun; Cai, Qinghang; Chen, Ronghua; Guo, Kailun; Tian, Wenxi; Qiu, Suizheng; Su, G.H.

doi:10.1016/j.anucene.2022.109244

Cited by 15 publications

(3 citation statements)

References 38 publications

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“…The discrete element method (DEM), proposed by Cundall and Strack [55], is currently widely used. For example, DEM models were adopted in the debris bed formation simulations of the pressurized water reactor [56,57], the fluid-structure coupling behavior of multiphase flow in accelerator-driven system [58,59], and the helium flow behavior in the spherical bed of a fusion reactor [60]. Thus, the DEM model was employed in this work to simulate the pebble-packing process.…”

Section: Simulation Methods and Parametersmentioning

confidence: 99%

Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds

et al. 2023

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The packing characteristics of a pebble bed are essential to understand the heat- and mass-transfer processes occurring within a granular system. Therefore, the packing characteristics of rectangular prismatic pebble beds randomly packed with mono-sized pebbles are analyzed. In terms of the average and local packing fraction distribution, coordination number, and radial distribution function, the effects of the rectangular tube aspect ratio and cross-sectional area on the packing properties of pebble beds are explored in depth. The findings indicate that the packing structures of the rectangular pebble bed exhibit noticeable fixed-wall effects. The average packing fraction and coordination number gradually decline as the rectangular tube aspect ratio rises. Close to the fixed wall, a noticeable wall effect can be seen in the distribution of axial and local packing fractions and the pebble center distribution. The wall effect has an increasing effect on the axial and local packing fraction distributions in rectangular tubes with increasing aspect ratios. Additionally, the average packing fraction and the average coordination number also increase as the cross-sectional area increases, indicating a gradual weakening of the wall effect as the cross-sectional area increases. Furthermore, the cross-sectional area and aspect ratio of the rectangular tubes affect the RDF values of the rectangular pebble beds but have no impact on the RDF features. The findings reported in this paper will be helpful for designing and optimizing pebble beds in the breeding blanket of fusion reactors.

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Section: Simulation Methods and Parametersmentioning

confidence: 99%

Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds

et al. 2023

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Section: 严重事故下碎片床形成过程特性分析mentioning

confidence: 99%

“…PANDA-SA 软件对压水堆的堆芯熔融严重事故下固体碎片沉降堆积形成碎片床的堆积特性开展了数值模拟 [16] ，为碎片床形成过程及后续碎片床可冷却性分析提供依据。针对碎片床堆积形成过程，对 QUEOS-Q21 实验 [22] 开展了固体碎片堆积特性模拟分析，获得了球形颗粒沉降堆积特性及流固耦合特性(如图 7 所示) ，定量对比了碎片床下降过程中的固体区域宽度变化、固体前沿高度变化(如图 8 所示) ，模拟结果与试验结果符合较好，验证了 PANDA-SA 开展 FCI 事故模拟分析的能力。图 7 碎片床形成过程特性分析 [16] Figure 7 Analysis of the characteristics of fragment bed formation process [16]. Copyright©2022, Elsevier.…”

Section: 严重事故下碎片床形成过程特性分析unclassified

Simulation of the key phenomena in nuclear reactor two-phase flow and severe accident with particle method

CHEN,

TIAN,

GUO

et al. 2024

Sci. Sin.-Tech.

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A volume-conservation particle shifting scheme for moving particle method simulating free-surface flow

Liu,

Wang,

Duan

et al. 2024

Comp. Part. Mech.

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In this study, a novel particle shifting scheme for the moving particle method simulating free surface flow is developed. The overall method is based on the framework of least square moving particle semi-implicit (LSMPS) method, enabling accurate and stable treatment of wall boundary without configuration of dummy or virtual wall particles. To avoid volume expansion, a volume-conservation particle shifting (VCPS) model is developed. An additional term considering the variation of particle numerical density is incorporated into the VCPS model to avoid volume expansion. Several numerical simulations are calculated to validate the effectiveness of the VCPS. It is demonstrated that LSMPS incorporating with VCPS shows satisfactory accuracy and superior capability to conserve volume.

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Numerical investigation of fluid–solid interaction during debris bed formation based on MPS-DEM

Cited by 15 publications

References 38 publications

Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds

Effects of the Aspect Ratio and Cross-Sectional Area of Rectangular Tubes on Packing Characteristics of Mono-Sized Pebble Beds

Simulation of the key phenomena in nuclear reactor two-phase flow and severe accident with particle method

A volume-conservation particle shifting scheme for moving particle method simulating free-surface flow

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