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Numerical studies of indoor airflow and particle dispersion by large Eddy simulation

机译：大涡模拟对室内空气流动和颗粒扩散的数值研究。

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The indoor airflow and contaminant particle concentration in two geometrically different rooms have been investigated using the Large Eddy Simulation (LES) technique based on Renormalization Group (RNG) theory derived by Yakhot, Orszag, Yakhot and Israeli, Journal of Scientific Computing, 1989. The first room is without contaminant particles. Its simulated air phase velocity profiles are validated against the measurements of Posner, Buchanan and Dunn-Rankin, Energy and Buildings, 2003. A good agreement is achieved between the prediction and measured data. The LES model successfully captures the mean flow trends as well as instantaneous flow information, which is required for appropriate design and evaluation of a ventilation system. The second room has contaminant particles, which are simulated with a Lagrangian particle tracking model. In this case, the LES model provides acceptable prediction of the contaminant particle concentration, compared to the particle concentration decay measured by Lu, Howarth, Adam and Riffat, Building and Environment, 1996. The numerical results reveal that the particle-wall impact model has a considerable effect on the Lagrangian concentration prediction. It is proposed that further improvements to the particle-wall impact model are required to correctly predict the contaminant particle concentration through the Lagrangian model.
机译：使用基于Yakhot，Orszag，Yakhot和Israel的重归化组（RNG）理论的大涡模拟（LES）技术，研究了两个几何形状不同的房间中的室内气流和污染物颗粒浓度，《科学计算杂志》（1989）。第一个房间没有污染物颗粒。根据Posner，Buchanan和Dunn-Rankin（《能源与建筑》，2003年）的测量结果验证了其模拟的空气速度曲线。在预测数据和测量数据之间取得了很好的一致性。 LES模型成功捕获了平均流量趋势以及瞬时流量信息，这是对通风系统进行适当设计和评估所必需的。第二个房间有污染物粒子，这些粒子是用拉格朗日粒子跟踪模型模拟的。在这种情况下，与Lu，Howarth，Adam和Riffat（建筑与环境，1996年）测量的颗粒浓度衰减相比，LES模型可以提供可接受的污染物颗粒浓度预测。数值结果表明，颗粒-壁碰撞模型具有对拉格朗日浓度预测有相当大的影响。提出需要对粒子-壁碰撞模型进行进一步的改进，以通过拉格朗日模型正确预测污染物粒子的浓度。

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