A challenging dam structural analysis: large-scale implicit thermo-mechanical coupled contact simulation on Tianhe-II

Tian, Rong; Zhou, Mingchao; Wang, Jingtao; Li, Yang; An, Hengbin; Xu, Xinhai; Wen, Liu; Wang, Lixiang; Xu, Quan; Leng, Juelin; Xu, Ran; Zhang, Bingyin; Liu, Weijie; Mo, Zeyao

doi:10.1007/s00466-018-1586-5

Cited by 14 publications

(17 citation statements)

References 79 publications

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“…It is common for the interface to be in a partial contact state with some parts in contact and others separated. In some cases, even an edge‐to‐edge or line‐to‐line contact state may occur, which will lead to stress concentration, resulting in uncontrollable structural failure such as extrusion damage …”

Section: Special Treatments For Concrete‐concrete Contactsmentioning

confidence: 99%

“…In some cases, even an edge-to-edge or line-to-line contact state may occur, which will lead to stress concentration, resulting in uncontrollable structural failure such as extrusion damage. 20 To improve the stress distribution, the soft joint technique, which uses soft filler in the joint, has been widely applied to concrete-concrete contacts in CFRDs. Therefore, this technique was also suggested for the galleries to be built in the clay-core rockfill dams.…”

Section: Perturbed Lagrange Formulation For Soft Joint Contactsmentioning

confidence: 99%

“…The dual mortar approach is superior in its numerical efficiency. This approach was previously applied by the authors to three‐dimensional simulations of CFRDs, including a mechanical analysis, thermal‐mechanical analysis, and high‐performance computing …”

Section: Introductionmentioning

confidence: 99%

“…For the reasons described above, the conventional mortar method leads to high computational costs. The dual mortar approach is crucial to accomplish the large‐scale numerical analysis of realistic engineering projects within an acceptable computational timeframe . The method has become increasingly popular, with new contributions focusing on many active directions, including multiphysics contacts, such as thermal mechanical, fluid structure, and others.…”

Section: Introductionmentioning

confidence: 99%

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A dual mortar contact method for porous media and its application to clay‐core rockfill dams

Wang

Zhou

Zhang

et al. 2019

Num Anal Meth Geomechanics

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Summary The clay‐core rockfill dam is a multibody contact system in which the hydromechanical response of the clay core plays a crucial role. This complex problem is highly challenging to model numerically. We present a numerical approach that considers the multibody contact, consolidation, and strong geometric and material nonlinearities for the modeling of clay‐core rockfill dams. Within the framework of the dual mortar finite element method, the presented approach considers the contact bodies as independent porous media continuums. The nonlinear contact conditions are derived based on the effective contact traction on contact interfaces and pore pressure continuity. The weak forms are obtained by introducing Lagrange multipliers as additional unknowns, which are then condensed through an extended general transformation. The presented method is first validated with a patch test considering the contact between two porous media. Then, a three‐dimensional analysis of the Rumei clay‐core rockfill dam is performed. The main numerical analysis concerns are the two observation galleries planned for construction inside the clay core. The galleries consist of dozens of tunnel‐like concrete blocks, giving rise to complex concrete‐concrete and concrete‐clay contacts. The discontinuous separation and sliding between concrete blocks are investigated. For the concrete‐concrete contact, both hard and soft joint approaches are evaluated and compared. The pore pressure results of the concrete structures are also analyzed.

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Section: Special Treatments For Concrete‐concrete Contactsmentioning

confidence: 99%

Section: Perturbed Lagrange Formulation For Soft Joint Contactsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A dual mortar contact method for porous media and its application to clay‐core rockfill dams

Wang

Zhou

Zhang

et al. 2019

Num Anal Meth Geomechanics

Self Cite

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“…At the same time, all the concrete slabs are in contact with the underlying rockfill body. Serving as a key impervious structure, the concrete face plays a determinative role in seepage prevention and dam safety [27]. It is very important to perform safety evaluations for CFRDs.…”

Section: Introductionmentioning

confidence: 99%

Shear Decoupled Parallel Scalable Preconditioners for Nonlinear Thermo-Mechanical Coupled Contact Applications

Wang

et al. 2021

J Sci Comput

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It is necessary to solve the thermo-mechanical coupled contact problem in structural mechanical analysis, such as the dam structural analysis. Because of the complexity of coupled models, it is very difficult to solve the discretized system in structural mechanical analysis. At the same time, for real applications such as the dam structural analysis, the simulation domain has complex structures, which result in a number of mesh elements more than 10 8 for high resolution simulations. Therefore, the scale of the discretized system is very large. In this paper, the discretized themo-mechanical coupling contact system on hundreds million unstructured meshes is parallel solved by the Newton-Krylov method, in which the efficiency of the Krylov methods is strongly dependent on the preconditioning. An efficient preconditioning method is constructed for the themo-mechanical coupling contact problem. Three steps are used to construct the preconditioner. Firstly, for the mechanical problem, the mechanical effect is analyzed for the dam structural analysis, and a preconditioner is constructed for the elasticity

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A dual mortar embedded mesh method for internal interface problems with strong discontinuities

Zhou

Zhang

2022

Numerical Meth Engineering

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Internal interface problems with strong discontinuities for inclusion-matrix systems are common and also challenging in engineering. In this work, a dual mortar embedded mesh method is proposed. An XFEM (extended finite element method) model is used for the underlying matrix, which can then be meshed without considering internal boundaries. The inclusions are treated by conventional FEM (finite element method) model. The FEM-XFEM coupling is treated by the dual mortar method, which uses the XFEM side to carry the Lagrange multiplier for imposing inclusion-matrix contact constraints. The present method is first validated by contact patch tests as well as bending tests and then applied to simulate strong discontinuities arising from bolt-rock and pile-soil interactions. The numerical results indicate that the present method is capable of simulating the internal interface problems with high accuracy, computational efficiency as well as mesh convenience.

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A challenging dam structural analysis: large-scale implicit thermo-mechanical coupled contact simulation on Tianhe-II

Cited by 14 publications

References 79 publications

A dual mortar contact method for porous media and its application to clay‐core rockfill dams

A dual mortar contact method for porous media and its application to clay‐core rockfill dams

Shear Decoupled Parallel Scalable Preconditioners for Nonlinear Thermo-Mechanical Coupled Contact Applications

A dual mortar embedded mesh method for internal interface problems with strong discontinuities

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