李 启 杨庆山 朱伟亮. 湍流入口条件下建筑非定常风场的大涡模拟拟[J]. 工程力学, 2012, 29(12): 274-280. DOI: 10.6052/j.issn.1000-4750.2011.05.0290
引用本文: 李 启 杨庆山 朱伟亮. 湍流入口条件下建筑非定常风场的大涡模拟拟[J]. 工程力学, 2012, 29(12): 274-280. DOI: 10.6052/j.issn.1000-4750.2011.05.0290
LI Qi. LARGE EDDY SIMULATION OF UNSTEADY WIND FIELD AROUND BUILDING USING TURBULENT INFLOW[J]. Engineering Mechanics, 2012, 29(12): 274-280. DOI: 10.6052/j.issn.1000-4750.2011.05.0290
Citation: LI Qi. LARGE EDDY SIMULATION OF UNSTEADY WIND FIELD AROUND BUILDING USING TURBULENT INFLOW[J]. Engineering Mechanics, 2012, 29(12): 274-280. DOI: 10.6052/j.issn.1000-4750.2011.05.0290

湍流入口条件下建筑非定常风场的大涡模拟拟

LARGE EDDY SIMULATION OF UNSTEADY WIND FIELD AROUND BUILDING USING TURBULENT INFLOW

  • 摘要: 考虑湍流入口条件对绕德州理工大学标准模型的三维非定常风场进行了数值模拟;比较了稳态入口边界条件下时均风速剖面形状对建筑表面压力分布的影响;分别采用旋涡法、谱合成法和预前模拟法生成湍流入口风速脉动;并将相应的大涡模拟结果与实测数据和风洞试验数据进行了对比分析。结果表明:时均风速剖面形状对时均流场的影响几乎可以忽略,但对瞬态流场的计算有很大影响,工程应用中建议根据当地实测数据修正风速剖面公式;采用由预前模拟法生成的湍流作为入口边界条件进行大涡模拟得到的建筑表面风压非定常特性与实际情况最为吻合;通过高精度插值算法,预生成的入口湍流时程数据能在位于相同地貌下不同建筑绕流的大涡模拟中反复使用,在一定程度上弥补了预前模拟耗时的缺陷。

     

    Abstract: A 3D unsteady wind field around Texas a Tech University building was simulated using large eddy simulations considering turbulent incoming flows. The influence of mean-velocity profiles on pressure distribution of the building was firstly analyzed. Then the building pressures were simulated using three kind of incoming turbulent inflows, which are generated by a Vortex method, Spectral Synthesizer and Precursor Simulation, respectively. Numerical results were compared with data from the field test and wind tunnel test. Comparisons show that the profile of mean-velocity has a slight influence on the mean pressure but has an obvious influence on the fluctuating pressure. Therefore, topography of a building location needs to be well-defined, which means the expression of a mean-velocity profile needs to be modified based on the data of local wind in engineering. Precursor Simulation was proved to be the best one for wind engineering during three present inflow generation methods, besides, the pre-simulated turbulent inflow data could be repeatedly used in the simulation of a wind field around different buildings located in similar topography. This makes up for the inherent time- and memory-consuming defect of precursor simulation.

     

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