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

被引:0
|
作者
Rong Tian
Mozhen Zhou
Jingtao Wang
Yang Li
Hengbin An
Xiaowen Xu
Longfei Wen
Lixiang Wang
Quan Xu
Juelin Leng
Ran Xu
Bingyin Zhang
Weijie Liu
Zeyao Mo
机构
[1] IAPCM,Software Center for High Performance Numerical Simulation
[2] Tsinghua University,State Key Laboratory of Hydroscience and Engineering
来源
Computational Mechanics | 2019年 / 63卷
关键词
Petascale computing; Life time safety; Ultra high dams; Hydraulic engineering; Dual mortar method; Thermo-mechanical-contact coupling; Extended finite element method; Preconditioning; Linear solver;
D O I
暂无
中图分类号
学科分类号
摘要
Due to huge bulk volume and extremely complex geometrical and geological features, it is forbiddingly difficult to perform a dam structural analysis with even moderate geometry fidelity in engineering practices. We present a high resolution of engineering structural analysis of the first ultra-high concrete-faced rockfill dam in China. Mesh resolution is taken to be 20 cm along slab thickness for the bulk volume of 20M m3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hbox {m}^{3}$$\end{document} of the whole dam. The engineering problem is solved by considering nonlinear behaviors such as joints’ contact nonlinearity, creep deformation, and strong thermo-mechanical coupling, as well as blended continuous-discontinuous approximation, on a mesh model of 1.1 billion dofs using 16K CPU cores of Tianhe-II. The problem to be solved is a challenging non-positive definite, non-symmetric and ill-conditioned matrix problem. The simulation confirms in the first time that the sunlight temperature effect can contribute up to a contact stress increment of maximum 10.9 MPa and explains frequent extrusion damage observed for the dam. As model tests are difficult to perform for high dams, with this first success, we envision that extreme-scale simulation would pose broad impact on the safety evaluation of high dams in future.
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页码:99 / 119
页数:20
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