| 桥梁断面静风荷载的格子Boltzmann方法数值计算 |
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| 引用本文： | 刘天成,葛耀君,曹丰产.桥梁断面静风荷载的格子Boltzmann方法数值计算[J].空气动力学学报,2009,27(1). |
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| 作者姓名： | 刘天成 葛耀君 曹丰产 |
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| 作者单位： | 1. 同济大学土木工程防灾国家重点实验室,上海,200092;中交公路规划设计院有限公司,北京,100010
2. 同济大学土木工程防灾国家重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金重点项目，交通部西部交通建设科技项目，国家高技术研究发展计划(863计划) |
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| 摘 要： | 通过引入反映湍流涡粘性的湍流松弛,得到了模拟高雷诺数湍流的BGK方程.在速度相空间、物理空间和时间上对BGK方程进行离散得到了三维十九速离散速度模型;结合分区计算技术,设计了格子Boltzmann并行算法;根据亚格子Smagorinsky模型,提出了直接从粒子分布函数计算湍流松弛时间的方法.用开发的并行计算程序对分体双箱截面和闭口箱梁截面的静风荷载进行了数值识别,得到的静力三分力系数和流场压力分布与风洞试验结果及CFD宏观方法计算结果吻合,并从表面压力分布入手分析了两种桥梁截面的绕流特点.
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| 关 键 词： | BGK方程 亚格子湍流模型 湍流松弛时间 桥梁断面 静风荷载 |
Numerical assessment of static wind loads on bridge deck section based on lattice Boltzmann method |
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| LIU Tian-cheng,GE Yao-jun,CAO Feng-chan.Numerical assessment of static wind loads on bridge deck section based on lattice Boltzmann method[J].Acta Aerodynamica Sinica,2009,27(1). |
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| Authors: | LIU Tian-cheng GE Yao-jun CAO Feng-chan |
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| Institution: | 1.State Key Laboratory for Disaster Reduction in Civil Engineering;Tongji University;Shanghai 200092;China;2.China Highway Planning and Design Institute Consultants Inc.;Beijing 100010;China |
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| Abstract: | The BGK equation is derived to simulate turbulence flow at high Reynolds number with the turbulence relaxation time represented the turbulence vicious,and it is discretized to three-dimension nineteen velocities model with discrete velocity,space step and time step.The lattice Boltzmann parallel arithmetic is designed combining with field partitioning technique.Otherwise,the turbulence relaxation time is computed directly from particle distribution function according to subgrid Smagorinsky model.The static ... |
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| Keywords: | BGK equation subgrid turbulence model turbulence relaxation time bridge deck section static wind loads |
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