Development of a GPGPU‐parallelized hybrid finite‐discrete element method for modeling rock fracture

  • Daisuke Fukuda
    Faculty of Engineering Hokkaido University Hokkaido 060‐8628 Japan
  • Mojtaba Mohammadnejad
    School of Engineering, College of Sciences and Engineering University of Tasmania Hobart Tasmania 7001 Australia
  • Hongyuan Liu
    School of Engineering, College of Sciences and Engineering University of Tasmania Hobart Tasmania 7001 Australia
  • Sevda Dehkhoda
    CSIRO Minerals Resources Business Unit Queensland Centre for Advanced, Technologies Brisbane Queensland 4069 Australia
  • Andrew Chan
    School of Engineering, College of Sciences and Engineering University of Tasmania Hobart Tasmania 7001 Australia
  • Sang‐Ho Cho
    Department of Mineral Resources and Energy Engineering Chonbuk National, University Jeollabuk‐do 561‐756 South Korea
  • Gyeong‐Jo Min
    Department of Mineral Resources and Energy Engineering Chonbuk National, University Jeollabuk‐do 561‐756 South Korea
  • Haoyu Han
    School of Engineering, College of Sciences and Engineering University of Tasmania Hobart Tasmania 7001 Australia
  • Jun‐ichi Kodama
    Faculty of Engineering Hokkaido University Hokkaido 060‐8628 Japan
  • Yoshiaki Fujii
    Faculty of Engineering Hokkaido University Hokkaido 060‐8628 Japan

抄録

<jats:title>Summary</jats:title><jats:p>The hybrid finite‐discrete element method (FDEM) is widely used for engineering applications, which, however, is computationally expensive and needs further development, especially when rock fracture process is modeled. This study aims to further develop a sequential hybrid FDEM code formerly proposed by the authors and parallelize it using compute unified device architecture (CUDA) C/C++ on the basis of a general‐purpose graphics processing unit (GPGPU) for rock engineering applications. Because the contact detection algorithm in the sequential code is not suitable for GPGPU parallelization, a different contact detection algorithm is implemented in the GPGPU‐parallelized hybrid FDEM. Moreover, a number of new features are implemented in the hybrid FDEM code, including the local damping technique for efficient geostatic stress analysis, contact damping, contact friction, and the absorbing boundary. Then, a number of simulations with both quasi‐static and dynamic loading conditions are conducted using the GPGPU‐parallelized hybrid FDEM, and the obtained results are compared both quantitatively and qualitatively with those from either theoretical analysis or the literature to calibrate the implementations. Finally, the speed‐up performance of the hybrid FDEM is discussed in terms of its performance on various GPGPU accelerators and a comparison with the sequential code, which reveals that the GPGPU‐parallelized hybrid FDEM can run more than 128 times faster than the sequential code if it is run on appropriate GPGPU accelerators, such as the Quadro GP100. It is concluded that the GPGPU‐parallelized hybrid FDEM developed in this study is a valuable and powerful numerical tool for rock engineering applications.</jats:p>

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