Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled Concrete
Since invented in 2003, rock-filled concrete (RFC) has gained much attention and has been successfully applied in more and more civil and hydraulic projects in China. This study developed a numerical framework to simulate self-compacting concrete (SCC) flows in the voids among rocks of RFC, which co...
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doaj-44ba67abf87d44e9aa1427d7ab07ff302020-11-25T01:41:44ZengMDPI AGMaterials1996-19442019-09-011219312810.3390/ma12193128ma12193128Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled ConcreteSong-Gui Chen0Chuan-Hu Zhang1Feng Jin2Peng Cao3Qi-Cheng Sun4Chang-Jun Zhou5Tianjin Research Institute for Water Transport Engineering, Ministry of Transport of the People’s Republic of China, Tianjin 300456, ChinaChina Gezhouba Group Three Gorges Construction Engineering Co., LTD, Yi Chang 443002, ChinaDepartment of Hydraulic Engineering, State Key Laboratory for Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaCollege of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, ChinaDepartment of Hydraulic Engineering, State Key Laboratory for Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaSchool of Transportation and Logistics, Dalian University of Technology, Dalian 116023, ChinaSince invented in 2003, rock-filled concrete (RFC) has gained much attention and has been successfully applied in more and more civil and hydraulic projects in China. This study developed a numerical framework to simulate self-compacting concrete (SCC) flows in the voids among rocks of RFC, which couples the lattice Boltzmann method and discrete element method (DEM). The multiple-relaxation-time scheme is used to simulate self-compacting mortar (SCM) for better stability while the motion of coarse aggregates in SCC is simulated with DEM. The immersed moving boundary method is incorporated to deal with the interactions between coarse aggregates and SCM. After validation, the coupled framework is applied to study SCC flows in a single channel and in porous media with multi-channels. A passing factor <i>PF</i> was proposed and calculated to describe quantitatively the passing ability of SCC through a single channel. The study found that jamming of SCC occurs when the ratio <i>Ar</i> of the gap width to particle diameter is smaller than 2.0 and the jamming risk increases with solid particles fraction while the passing ability has a weak relation with the pressure gradient. Further, SCC flow is self-tuning in porous media with multi-channels and it is prone to go through larger or wider gaps. Exceeded existence of narrow gaps will significantly increase the jamming risk.https://www.mdpi.com/1996-1944/12/19/3128rock-filled concreteself-compacting concretelattice boltzmann methoddiscrete element methodpassing factor |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Song-Gui Chen Chuan-Hu Zhang Feng Jin Peng Cao Qi-Cheng Sun Chang-Jun Zhou |
spellingShingle |
Song-Gui Chen Chuan-Hu Zhang Feng Jin Peng Cao Qi-Cheng Sun Chang-Jun Zhou Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled Concrete Materials rock-filled concrete self-compacting concrete lattice boltzmann method discrete element method passing factor |
author_facet |
Song-Gui Chen Chuan-Hu Zhang Feng Jin Peng Cao Qi-Cheng Sun Chang-Jun Zhou |
author_sort |
Song-Gui Chen |
title |
Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled Concrete |
title_short |
Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled Concrete |
title_full |
Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled Concrete |
title_fullStr |
Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled Concrete |
title_full_unstemmed |
Lattice Boltzmann-Discrete Element Modeling Simulation of SCC Flowing Process for Rock-Filled Concrete |
title_sort |
lattice boltzmann-discrete element modeling simulation of scc flowing process for rock-filled concrete |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-09-01 |
description |
Since invented in 2003, rock-filled concrete (RFC) has gained much attention and has been successfully applied in more and more civil and hydraulic projects in China. This study developed a numerical framework to simulate self-compacting concrete (SCC) flows in the voids among rocks of RFC, which couples the lattice Boltzmann method and discrete element method (DEM). The multiple-relaxation-time scheme is used to simulate self-compacting mortar (SCM) for better stability while the motion of coarse aggregates in SCC is simulated with DEM. The immersed moving boundary method is incorporated to deal with the interactions between coarse aggregates and SCM. After validation, the coupled framework is applied to study SCC flows in a single channel and in porous media with multi-channels. A passing factor <i>PF</i> was proposed and calculated to describe quantitatively the passing ability of SCC through a single channel. The study found that jamming of SCC occurs when the ratio <i>Ar</i> of the gap width to particle diameter is smaller than 2.0 and the jamming risk increases with solid particles fraction while the passing ability has a weak relation with the pressure gradient. Further, SCC flow is self-tuning in porous media with multi-channels and it is prone to go through larger or wider gaps. Exceeded existence of narrow gaps will significantly increase the jamming risk. |
topic |
rock-filled concrete self-compacting concrete lattice boltzmann method discrete element method passing factor |
url |
https://www.mdpi.com/1996-1944/12/19/3128 |
work_keys_str_mv |
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