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Uncertainty quantification of upstream wind effects on single-sided ventilation in a building using generalized polynomial chaos method

机译：广义多项式混沌法对建筑物单侧通风上游风影响的不确定性量化

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The single-sided ventilation rate in a building can be estimated using an empirical correlation that developed based on the results of deterministic experiments or numerical simulations. Owing to the complex flow patterns near a building, it is difficult to establish a robust correlation considering upstream wind uncertainties such as wind speed and direction. We perform RANS simulations and generalized polynomial chaos-based uncertainty quantification analysis to investigate the effects of the upstream uncertainties on the ventilation rate. It was found that the reference wind speed and the incident angle significantly affect the ventilation rate. Warren and Parkins' correlation shows a reasonable prediction of the average ventilation rate over the incident angle, while Larsen's correlation, in general, underestimates the ventilation rates. Further, the average ventilation rates in the side direction are lower than those in the windward and leeward directions, while larger variations of the ventilation rate in the leeward direction are found at high speeds, compared to those in the other directions. Owing to unresolved turbulent induced ventilation rates in the RANS model, the present ventilation rates may not accurately provide actual ventilation rates. Nevertheless, the present UQ analysis indicates that the existing correlation between the ventilation rate and the wind speed must account for the influence of the wind direction, especially at high wind speeds, in order to estimate the single-sided ventilation rate in a building with greater accuracy. (C) 2017 Elsevier Ltd. All rights reserved.
机译：可以使用基于确定性实验或数值模拟结果得出的经验相关性来估算建筑物中的单面通风率。由于建筑物附近的复杂流动模式，考虑到上游风的不确定性（例如风速和风向），很难建立稳固的相关性。我们执行RANS模拟和基于广义多项式混沌的不确定性量化分析，以研究上游不确定性对通风率的影响。发现参考风速和入射角显着影响通风率。沃伦（Warren）和帕金斯（Parkins）的相关性可以合理地预测入射角上的平均通风率，而拉森（Larsen）的相关性通常会低估通风率。此外，在侧面方向上的平均通风率低于在上风和下风方向上的平均通风率，而与其他方向相比，在高速下在背风方向上的通风率变化较大。由于RANS模型中未解决的湍流引起的通风速率，当前的通风速率可能无法准确提供实际的通风速率。然而，目前的UQ分析表明，通风率和风速之间的现有相关性必须考虑风向的影响，尤其是在高风速时，才能估算出更大通风量的建筑物中的单侧通风率。准确性。 （C）2017 Elsevier Ltd.保留所有权利。

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