A study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled CFD-DEM approach
This paper presents an extended numerical study on submarine landsliding induced by instantaneous thermal dissociation of a methane hydrate layer, by considering different dissociation scenarios in terms of position and volume of dissociated gas hydrates. A novel scheme of coupling computational flu...
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ftunivmilanobic:oai:boa.unimib.it:10281/108998 2024-04-14T08:14:51+00:00 A study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled CFD-DEM approach Jiang, M Sun, C CROSTA, GIOVANNI Zhang, W. Jiang, M Sun, C Crosta, G Zhang, W 2015 http://hdl.handle.net/10281/108998 https://doi.org/10.1016/j.enggeo.2015.02.007 eng eng Elsevier info:eu-repo/semantics/altIdentifier/wos/WOS:000353853000001 volume:190 firstpage:1 lastpage:16 numberofpages:16 journal:ENGINEERING GEOLOGY http://hdl.handle.net/10281/108998 doi:10.1016/j.enggeo.2015.02.007 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84924262015 www.elsevier.com/inca/publications/store/5/0/3/3/3/0/ Computational fluid dynamic Distinct element method Methane hydrate Submarine landslide Geotechnical Engineering and Engineering Geology Geology info:eu-repo/semantics/article 2015 ftunivmilanobic https://doi.org/10.1016/j.enggeo.2015.02.007 2024-03-21T16:52:29Z This paper presents an extended numerical study on submarine landsliding induced by instantaneous thermal dissociation of a methane hydrate layer, by considering different dissociation scenarios in terms of position and volume of dissociated gas hydrates. A novel scheme of coupling computational fluid dynamics and distinct element method (CFD-DEM) is implemented. The behavior of fluid is simulated by CFD incorporating an empirical equation of state for slightly compressible liquid, whereas that of sediment skeleton with methane hydrates by DEM through a two-dimensional thermo-hydro-mechanical bond contact model. The scenario of whole hydrate dissociation identifies four typical stages of submarine landsliding: the initiation of landslide after hydrate dissociation, the onset of the submarine landslide, the sliding process, and the final deposition and stabilization, which is characterized by some microscopic variables (e.g. particle displacement, fluid velocity, excess hydrostatic pressure, particle-scale energy input and dissipation) so to attain a complete analysis of the landslide process. Reasonable representation of the slope instability phenomenon as triggered by thermal dissociation of gas hydrates is obtained. Besides, slope failure scenarios with different positions and volumes of the occurring MH dissociation are presented to better understand their influence on the evolution of the instability. Four landslide types are generated by the different dissociation scenarios: fall, slump, flow and a combination of slump and flow, which are further analyzed by outputting some microscopic information (e.g. force-chain, averaged pure rotation rate and bond distributions). Article in Journal/Newspaper Methane hydrate Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Engineering Geology 190 1 16 |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
Computational fluid dynamic Distinct element method Methane hydrate Submarine landslide Geotechnical Engineering and Engineering Geology Geology |
spellingShingle |
Computational fluid dynamic Distinct element method Methane hydrate Submarine landslide Geotechnical Engineering and Engineering Geology Geology Jiang, M Sun, C CROSTA, GIOVANNI Zhang, W. A study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled CFD-DEM approach |
topic_facet |
Computational fluid dynamic Distinct element method Methane hydrate Submarine landslide Geotechnical Engineering and Engineering Geology Geology |
description |
This paper presents an extended numerical study on submarine landsliding induced by instantaneous thermal dissociation of a methane hydrate layer, by considering different dissociation scenarios in terms of position and volume of dissociated gas hydrates. A novel scheme of coupling computational fluid dynamics and distinct element method (CFD-DEM) is implemented. The behavior of fluid is simulated by CFD incorporating an empirical equation of state for slightly compressible liquid, whereas that of sediment skeleton with methane hydrates by DEM through a two-dimensional thermo-hydro-mechanical bond contact model. The scenario of whole hydrate dissociation identifies four typical stages of submarine landsliding: the initiation of landslide after hydrate dissociation, the onset of the submarine landslide, the sliding process, and the final deposition and stabilization, which is characterized by some microscopic variables (e.g. particle displacement, fluid velocity, excess hydrostatic pressure, particle-scale energy input and dissipation) so to attain a complete analysis of the landslide process. Reasonable representation of the slope instability phenomenon as triggered by thermal dissociation of gas hydrates is obtained. Besides, slope failure scenarios with different positions and volumes of the occurring MH dissociation are presented to better understand their influence on the evolution of the instability. Four landslide types are generated by the different dissociation scenarios: fall, slump, flow and a combination of slump and flow, which are further analyzed by outputting some microscopic information (e.g. force-chain, averaged pure rotation rate and bond distributions). |
author2 |
Jiang, M Sun, C Crosta, G Zhang, W |
format |
Article in Journal/Newspaper |
author |
Jiang, M Sun, C CROSTA, GIOVANNI Zhang, W. |
author_facet |
Jiang, M Sun, C CROSTA, GIOVANNI Zhang, W. |
author_sort |
Jiang, M |
title |
A study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled CFD-DEM approach |
title_short |
A study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled CFD-DEM approach |
title_full |
A study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled CFD-DEM approach |
title_fullStr |
A study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled CFD-DEM approach |
title_full_unstemmed |
A study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled CFD-DEM approach |
title_sort |
study of submarine steep slope failures triggered by thermal dissociation of methane hydrates using a coupled cfd-dem approach |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://hdl.handle.net/10281/108998 https://doi.org/10.1016/j.enggeo.2015.02.007 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000353853000001 volume:190 firstpage:1 lastpage:16 numberofpages:16 journal:ENGINEERING GEOLOGY http://hdl.handle.net/10281/108998 doi:10.1016/j.enggeo.2015.02.007 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84924262015 www.elsevier.com/inca/publications/store/5/0/3/3/3/0/ |
op_doi |
https://doi.org/10.1016/j.enggeo.2015.02.007 |
container_title |
Engineering Geology |
container_volume |
190 |
container_start_page |
1 |
op_container_end_page |
16 |
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1796313098902044672 |