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Analysis of Natural Cross-Ventilation in Buildings Driven by Wind and Buoyancy Forces

In order to investigate natural cross-ventilation in buildings driven by combined wind and thermal buoyancy forces, computational fluid dynamics (CFD) with the DES model is applied. The aim of this paper is to investigate the influence of thermal buoyancy force on natural ventilation in buildings under different heating conditions. The simulation results indicate that the thermal effect has a significant impact on airflow structure and airflow rate of building at low Froude numbers, however, the thermal effect can be neglected when Froude number value is greater than 6.