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Parallel computing of discrete element method on multi-core processors

Particuology 2011年第4期9卷 398-405页

作者： Yusuke Shigeto mikio sakai Department of Systems Innovation School of Engineering The University of Tokyo

This paper describes parallel simulation techniques for the discrete element method （DEM） on multi-core processors. Recently, multi-core CPU and GPU processors have attracted much attention in accelerating computer simulations in various fields. We propose a new algorithm for multi-thread parallel computation of DEM, which makes effective use of the available memory and accelerates the computation. This study shows that memory usage is drastically reduced by using this algorithm. To show the practical use of DEM in industry, a large-scale powder system is simulated with a complicated drive unit. We compared the performance of the simulation between the latest GPU and CPU processors with optimized programs for each processor. The results show that the difference in performance is not substantial when using either GPUs or CPUs with a multi-thread parallel algorithm. In addition, DEM algorithm is shown to have high scalabilitv in a multi-thread parallel computation on a CPU.

关键词： Discrete element method Parallel computing Multi-core processor GPGPU

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Visualization study on the coarse graining DEM for large-scale N gas-solid flow systems

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Particuology 2021年第6期19卷 24-33页

作者： Yuki Mori mikio sakai Department of Nuclear Engineering and Management School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan Resilience Engineering Research Center School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

Gas-solid flows are ubiquitous in industrial *** coupled model of the discrete element method(DEM)and computational fluid dynamics(CFD)is one of the techniques for the simulation of the gas-solid *** enhance the applicability of the DEM-CFD method,the coarse graining DEM has been developed to simulate large-scale powder *** coarse graining DEM is a scaling law model and hence can simulate large-scale systems using a smaller number of particles than the actual *** the coarse graining DEM enables to effectively simulate large-scale powder systems on a single PC,visualized image is lack of reality due to reduced spatial *** a novel visualization method is developed to produce realistic *** the proposed technique,the virtual particles are located by considering the motion and location of the coarse grain *** show the adequacy of the proposed method,two types of visualization based on the computational results are made:a blow-up of powder due to injected gas flow and a spouted *** these systems,the visualized images are shown to be improved by the proposed visualization *** effectiveness of the proposed method is proved by the agreement of the images based on the calculation results between the standard DEM-CFD method and coarse graining DEM.

关键词： DEM-CFD method Coarse graining DEM Computer graphics

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