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首页> 外文期刊>Building and Environment >Investigation of the Reynolds number independence of cavity flow in 2D street canyons by wind tunnel experiments and numerical simulations
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Investigation of the Reynolds number independence of cavity flow in 2D street canyons by wind tunnel experiments and numerical simulations

机译：风隧道实验和数值模拟对2D街道峡谷腔流量雷诺数独立性的研究

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摘要

The Reynolds number independence (Re independence) criterion of Re 11,000 is widely adopted to fulfill the dynamic similarity between the urban flow modeling and the down-scale measurements. However, for 2D street canyons with H/W = 1.5, experiments, numerical simulations, and in-situ observations have reported different vortex-flow regimes with similar building configurations but at different scales. This study uses both wind tunnel experiments and numerical simulations to revisit the Re-independent flow regimes and Re independence criteria with an extensive Re range for idealized 2D street canyons with various aspect ratios (H/W = 1.1, 2.4, 3, 4, and 5). We introduced an optimized ratio of relative changes (RRCs) to evaluate the flow regimes' similarity. The wind tunnel experiment confirms that the cavity flow with H/W = 1.1 meets the Re independence when reference building Re (Reref) exceeds 11,000. Simulations validated by the experiment results are conducted to investigate detailed flow regimes and the critical Re (Rec) range for each aspect ratio. The canyons with H/W = 2.4, 3, and 4 are dominated by a single asymmetric vortex when the Re independence is satisfied, while there are two vertically-stacked counter-rotating vortices in the canyon with H/W = 5. The value range of Rec increases with aspect ratio from 1.9 x 104-2.6 x 104 (H/W = 2.4) to 1.3 x 105-2.1 x 105 (H/W = 3), and 2.1 x 106-6.4 x 106 (H/W = 4 and 5). Our results indicate that the fully Re-independent flow regimes in deep canyons have fewer vortices than the literature value with down-scale experiments and simulations. The variant Rec with different aspect ratios suggests the requirement to conduct the Re-independence test for different model configurations.
机译：Re＆gt的雷诺数独立性（重新独立）标准;广泛采用11,000才能满足城市流模型与下尺度测量之间的动态相似性。然而，对于具有H / W＆GT的2D街道峡谷; = 1.5，实验，数值模拟和原位观察报告了不同的涡流制度，具有类似的建筑配置，但在不同的尺度上。该研究使用风洞实验和数值模拟来重新定义重新独立的流动制度和重新独立性标准，并且对于具有各种纵横比的理想2D街道峡谷的广泛重新系列（H / W = 1.1,2.4,3,4和5）。我们介绍了相对变化（RRC）的优化比率来评估流量制度的相似性。风洞实验证实，当参考建筑物RE（REREF）超过11,000时，腔流量与H / W = 1.1符合重新独立性。通过实验结果验证的模拟，以调查每个纵横比的详细流动制度和关键RE（REC）范围。具有H / W = 2.4,3和4的峡谷是在满足重新独立时的单个不对称涡旋的主导，而在峡谷中有两个垂直堆叠的反向旋转涡旋，其中H / W = 5.值REC的范围从1.9 x 104-2.6 x 104（h / w = 2.4）到1.3 x 105-2.1 x 105（h / w = 3），和2.1 x 106-6.4 x 106（h / w = 4和5）。我们的结果表明，深峡谷的完全重新独立的流量制度比具有下尺度实验和模拟的文献值较少的涡流。具有不同纵横比的变型REC表明对不同模型配置进行重建测试的要求。

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  • 来源
    《Building and Environment》 |2021年第8期|107965.1-107965.20|共20页
  • 作者

    Lin Yuanyuan; Hang Jian; Yang Hongyu; Chen Lan; Chen Guanwen; Ling Hong; Sandberg Mats; Claesson Leif; Lam Cho Kwong Charlie;

  • 作者单位

    Univ Gavle Dept Bldg Engn Energy Syst & Sustainabil Sci S-80176 Gavle Sweden|Sun Yat Sen Univ Sch Atmospher Sci Zhuhai Peoples R China|Minist Educ Key Lab Trop Atmosphere Ocean Syst Zhuhai Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai Peoples R China|Minist Educ Key Lab Trop Atmosphere Ocean Syst Zhuhai Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai Peoples R China|Minist Educ Key Lab Trop Atmosphere Ocean Syst Zhuhai Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai Peoples R China|Minist Educ Key Lab Trop Atmosphere Ocean Syst Zhuhai Peoples R China|Hong Kong Polytech Univ Dept Bldg Serv Engn Hung Hom Hong Kong Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai Peoples R China|Minist Educ Key Lab Trop Atmosphere Ocean Syst Zhuhai Peoples R China;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai Peoples R China|Minist Educ Key Lab Trop Atmosphere Ocean Syst Zhuhai Peoples R China;

    Univ Gavle Dept Bldg Engn Energy Syst & Sustainabil Sci S-80176 Gavle Sweden;

    Univ Gavle Dept Bldg Engn Energy Syst & Sustainabil Sci S-80176 Gavle Sweden;

    Sun Yat Sen Univ Sch Atmospher Sci Zhuhai Peoples R China|Minist Educ Key Lab Trop Atmosphere Ocean Syst Zhuhai Peoples R China|Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    2D street canyons; Reynolds number independence; Cavity flow regime; Wind tunnel experiment; Computational fluid dynamics (CFD);

    机译：2D街峡谷;雷诺数独立;腔流量;风洞实验;计算流体动力学（CFD）;

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