A Mathematical Study of the Structure of Cross-Ventilation Flow in an Isolated Cylindrical Building

Abstract- Cross-ventilation serves as an efficient means to expel pollutants and heat from buildings, requiring no energy consumption due to variations in wind pressure. The efficacy of ventilation is greatly influenced by the cross-ventilation flow’s structure. However, little thought has been paid to comprehending how the cross-section of a building affects the cross-ventilation flow structure. By statistically examining the cross-ventilation flow structure in a standalone cylindrical building, this study seeks to close this gap. When compared to published experimental data, the numerical simulation findings show a very small simulation error of 0.8% in the volume ventilation rate. This demonstrates how well the numerical approach predicts the flow of cross-ventilation in isolated buildings. Pressure loss decreases when air moves through the curved side walls of the cylindrical building, allowing for more air to enter. In contrast to a square building, this causes the oncoming jet to enter more horizontally. When Root-Mean-Square streamwise velocity and turbulence kinetic energy are analyzed, the square building exhibits more airflow fluctuation outdoors, whereas the cylindrical building exhibits more turbulence interior. Notably, there is an 8.3% improvement in the cylindrical building’s volume ventilation rate. In addition, the cylindrical building’s air exchange rate is 1.38 times higher than the square building’s.