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高雷诺数湍流风场大涡模拟的并行直接求解方法

包芸 习令楚

包芸, 习令楚. 高雷诺数湍流风场大涡模拟的并行直接求解方法[J]. 力学学报, 2020, 52(3): 656-662. doi: 10.6052/0459-1879-20-052
引用本文: 包芸, 习令楚. 高雷诺数湍流风场大涡模拟的并行直接求解方法[J]. 力学学报, 2020, 52(3): 656-662. doi: 10.6052/0459-1879-20-052
Bao Yun, Xi Lingchu. PARALLEL DIRECT METHOD OF LES FOR TURBULENT WIND FIELD WITH HIGH REYNOLDS NUMBER[J]. Chinese Journal of Theoretical and Applied Mechanics, 2020, 52(3): 656-662. doi: 10.6052/0459-1879-20-052
Citation: Bao Yun, Xi Lingchu. PARALLEL DIRECT METHOD OF LES FOR TURBULENT WIND FIELD WITH HIGH REYNOLDS NUMBER[J]. Chinese Journal of Theoretical and Applied Mechanics, 2020, 52(3): 656-662. doi: 10.6052/0459-1879-20-052

高雷诺数湍流风场大涡模拟的并行直接求解方法

doi: 10.6052/0459-1879-20-052
基金项目: 1)国家自然科学基金资助项目(11772362).
详细信息
    通讯作者:

    2)包芸,教授,主要从事计算流体力学研究. E-mail:stsby@mail.sysu.edu.cn

  • 中图分类号: O357.5

PARALLEL DIRECT METHOD OF LES FOR TURBULENT WIND FIELD WITH HIGH REYNOLDS NUMBER

  • 摘要: 在环境流体力学中,风场是风沙流、风雪流等自然环境特性问题研究的动力源和基础. 通常采用壁湍流模型进行风场大涡模拟(large eddy simulation, LES)计算,但受到计算规模的限制使得 高雷诺数风场的模拟计算难以实现. 并行计算技术是解决大规模高雷诺数风场大涡模拟的关键技术之一. 在不可压湍流风场的LES模拟中,压力泊松方程的并行计算技术是进行规模并行计算的困难点. 根据风场流动模拟计算的特点,采用水平网格等距而垂直于地面网格非等距,在解决规模并行计算中求解压力泊松方程的难点问题时,利用FFT解耦三维泊松方程使其变为垂向的一维三对角方程, 并利用可并行的三对角方程PDD求解技术,可建立三维泊松方程的直接并行求解技术. 结合其它容易并行的动量方程计算,本文建立风场LES模拟的并行直接求解方法(parallel direct method-LES, PDM-LES). 在超级计算机上对新方法进行并行效率测试,并行计算效率达到90${\%}$. 新的方法可用于进行湍流风场大涡模拟的大规模并行计算. 计算结果表明,湍流风场瞬时速度分布近壁面存在条带状的拟序结构,平均场的速度分布符合速度对数律特性,风场湍流特性基本合理.

     

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出版历程
  • 收稿日期:  2020-02-21
  • 刊出日期:  2020-06-10

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