In previous reports, the positive SARS-CoV-2 nucleic acid was detected in the fecal samples from confirmed pneumonia patients, suggesting a high probability of the fecal-oral transmission. To date, however, the role played by the drainage system of a high-rise building in the virus transmission is not clear and especially studies on the dynamics mechanism behind is scarce. From this point of view, the present work carries out a computational fluid dynamics (CFD) modeling to investigate the effects of the water seal effectiveness of the floor drain, the negative/positive pressures (P₁, P₂) in the bathroom, temperature differential (ΔT), outside wind velocity (v), the piping fittings and the negative pressure at the cowl (P₃) on the transmission of the virus-laden aerosol particles in a drainage system of a typical 7-storeys residential building. The CFD models are first validated by the previous experiments in literature. Numerical results imply that the drainage system might play an essential role to the virus transmission. Then, results indicate that, the leakage risk of the aerosol particles via the floor drain with inefficient water-seal (UFD) mainly exists at the upper floors above the neutral pressure level (NPL). Besides, the negative and positive pressures at the bathroom can enhance and reduce the exposure risk of aerosol particles from the corresponding UFD, respectively. The ΔT increasing does not modify the location of the NPL. Moreover, the exposure risk of aerosol particles can be effectively avoided by the well water-sealed floor drains and/or the presence of a proper negative pressure at the cowl on the top floor. Finally, based on the CFD results, several protection suggestions on the drainage system and human activities are provided.

在此前的报道中，在确诊肺炎患者的粪便样本中检测到SARS-CoV-2核酸阳性，表明粪口传播的可能性很大。但迄今为止，高层建筑排水系统在病毒传播中所起的作用尚不明确，尤其是对其背后的动力学机制研究较少。从这个角度来看，目前的工作进行了计算流体动力学 (CFD) 建模，以研究地漏的水封效果、浴室中的负压/正压 ( P ₁、P ₂ )、温度的影响。微分（ΔT），外风速（v)、管道配件和整流罩处的负压 ( P ₃ ) 对典型 7 层住宅楼排水系统中载有病毒的气溶胶颗粒传输的影响。CFD 模型首先通过文献中的先前实验进行验证。数值结果表明排水系统可能对病毒传播起着至关重要的作用。然后，结果表明，气溶胶颗粒通过低效水封（UFD）地漏泄漏的风险主要存在于中性压力水平（NPL）以上的高层。此外，浴室的负压和正压可以分别增强和降低相应 UFD 的气溶胶颗粒暴露风险。ΔT _增加不会改变不良贷款的位置。此外，良好的水封地漏和/或顶层整流罩处适当的负压可有效避免气溶胶颗粒的暴露风险。最后，根据CFD结果，提出了排水系统和人类活动的保护建议。