Abstract
Parallel analyses about the dynamic responses of a large-scale water conveyance tunnel under seismic excitation are presented in this paper. A full three-dimensional numerical model considering the water-tunnel-soil coupling is established and adopted to investigate the tunnel’s dynamic responses. The movement and sloshing of the internal water are simulated using the multi-material Arbitrary Lagrangian Eulerian (ALE) method. Nonlinear fluid–structure interaction (FSI) between tunnel and inner water is treated by using the penalty method. Nonlinear soil-structure interaction (SSI) between soil and tunnel is dealt with by using the surface to surface contact algorithm. To overcome computing power limitations and to deal with such a large-scale calculation, a parallel algorithm based on the modified recursive coordinate bisection (MRCB) considering the balance of SSI and FSI loads is proposed and used. The whole simulation is accomplished on Dawning 5000 A using the proposed MRCB based parallel algorithm optimized to run on supercomputers. The simulation model and the proposed approaches are validated by comparison with the added mass method. Dynamic responses of the tunnel are analyzed and the parallelism is discussed. Besides, factors affecting the dynamic responses are investigated. Better speedup and parallel efficiency show the scalability of the parallel method and the analysis results can be used to aid in the design of water conveyance tunnels.
Highlights
The dynamic responses of a buried tunnel in general, and its seismic responses, in particular, are of much interest [1,2,3]
The basic idea of modified recursive coordinate bisection (MRCB) contains the following steps: firstly, a combined coordinate transformation is applied to the model according to its characteristics; the domain decomposition approach is used to deal with the deformed model, and the model is divided into the required number of subdomains; the original model is split by mapping the partitioned subdomains back
To evaluate the aseismic ability of water conveyance tunnels, this paper presents the full scale three-dimensional nonlinear finite element model of a large-scale water conveyance tunnel and a series of numerical tests
Summary
The dynamic responses of a buried tunnel in general, and its seismic responses, in particular, are of much interest [1,2,3]. With the development of high-performance computing, full scale numerical simulations considering fluid–structure interaction (FSI) emerge constantly, among which the Arbitrary Lagrangian Eulerian (ALE) based fluid structure coupling algorithm has been used widely. The ALE based fluid–structure interaction approach is adopted in this study for analyses of the water conveyance tunnel subjected to earthquakes. Though a number of ideas for parallelized finite element computational methods have been developed [22], the further study for one such scale model with lots of detections and computations for contact (including SSI) and FSI is still needed to obtain more even load distribution and higher parallel efficiency. The proposed domain decomposition (MRCB) based parallel computing method is used for analyses of the water conveyance tunnel subjected to earthquakes.
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