Investigation of the numerical simulation of debris flow fluid with concern of phase transition

From a variety of yield stress fluid models, an elastoviscoplastic Herschel-Bulkley (EVPHB) model written in 3D is selected and coupled with a Finite Element Method with Lagrangian Integration Points (FEMLIP) to solve boundary value problems with large deformation process. By tracing the historical...

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Bibliographic Details
Published inFrontiers in earth science (Lausanne) Vol. 10
Main Authors Zhao, Binbin, Cheng, Yongfeng, Liu, Yi, Kong, Xiaoang, Yang, Zhi, Tong, Ruiming, Xu, Xiyu, Deng, Yuanjing
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 29.09.2022
Subjects
debris flow
fluid
numerical simulation
phase transition
yield stress
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Summary:From a variety of yield stress fluid models, an elastoviscoplastic Herschel-Bulkley (EVPHB) model written in 3D is selected and coupled with a Finite Element Method with Lagrangian Integration Points (FEMLIP) to solve boundary value problems with large deformation process. By tracing the historical variables of a material point, it is verified that in a time-independent flow the elastic strain and viscous strain rate could be accurately reproduced by EVPHB model. For a time-dependent flow, because of the addition of elasticity, the EVPHB model makes the material experience a deformation process which is significantly distinctive from that produced by a pure regularized Herschel-Bulkley model. Benchmarks also show that in FEMLIP the yielded and unyielded zones could be easily defined by EVPHB model according to the stress of a material point. Lastly, it is shown that EVPHB model also induces a stress relaxation process for materials under constant strain. The suitability of FEMLIP to model elastoviscoplastic fluid is verified.
ISSN:2296-6463
2296-6463
DOI:10.3389/feart.2022.982332