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基于MP-PIC的鼓泡流化床内煤气化过程数值模拟
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作者 刘晓环 杨世亮 +1 位作者 熊勤钢 胡建杭 《工程热物理学报》 EI CAS CSCD 北大核心 2023年第8期2161-2166,共6页
本文采用多相流体网格质点方法探讨了流化床煤气化系统中颗粒尺度行为及不同操作参数(床层温度、气化剂流率)对气化特性的影响。研究结果表明:气化系统床层底部及稠密区处传热系数较大;煤和惰性床料的传热系数轴向分布不均匀且具有不同... 本文采用多相流体网格质点方法探讨了流化床煤气化系统中颗粒尺度行为及不同操作参数(床层温度、气化剂流率)对气化特性的影响。研究结果表明:气化系统床层底部及稠密区处传热系数较大;煤和惰性床料的传热系数轴向分布不均匀且具有不同的分布特征;随着床层温度的升高,煤和床料的传热系数均增加;提高气化炉内床层温度、空气流率、氧气流率和蒸气流率,碳转化率分别提高了16.3%、2.8%、4.1%和2.8%;与其他操作条件相比,床层温度对提高碳转化率的效果最显著。 展开更多
关键词 煤气化 鼓泡流化床 多相流体网格质点 碳转化率 洁净煤技术
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Efficient parallel implementation of the lattice Boltzmann method on large clusters of graphic processing units 被引量:6
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作者 xiong qingang LI Bo +5 位作者 XU Ji FANG XiaoJian WANG XiaoWei WANG LiMin HE XianFeng GE Wei 《Chinese Science Bulletin》 SCIE EI CAS 2012年第7期707-715,共9页
Many-core processors, such as graphic processing units (GPUs), are promising platforms for intrinsic parallel algorithms such as the lattice Boltzmann method (LBM). Although tremendous speedup has been obtained on a s... Many-core processors, such as graphic processing units (GPUs), are promising platforms for intrinsic parallel algorithms such as the lattice Boltzmann method (LBM). Although tremendous speedup has been obtained on a single GPU compared with mainstream CPUs, the performance of the LBM for multiple GPUs has not been studied extensively and systematically. In this article, we carry out LBM simulation on a GPU cluster with many nodes, each having multiple Fermi GPUs. Asynchronous execution with CUDA stream functions, OpenMP and non-blocking MPI communication are incorporated to improve efficiency. The algorithm is tested for two-dimensional Couette flow and the results are in good agreement with the analytical solution. For both the oneand two-dimensional decomposition of space, the algorithm performs well as most of the communication time is hidden. Direct numerical simulation of a two-dimensional gas-solid suspension containing more than one million solid particles and one billion gas lattice cells demonstrates the potential of this algorithm in large-scale engineering applications. The algorithm can be directly extended to the three-dimensional decomposition of space and other modeling methods including explicit grid-based methods. 展开更多
关键词 格子BOLTZMANN方法 图形处理单元 并行算法 集群 COUETTE流 LBM模拟 OPENMP 直接数值模拟
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