Paper Conference

Proceedings of ASim Conference 2014: 2nd Asia conference of IBPSA-China, Japan, Korea


Large-Eddy Simulation for Turbulent Nature of Flow and Pressure Fields over Urban Building Arrays

Chiyoko Hirose, Aya Hagishima, Naoki Ikegaya, Jun Tanimoto

Abstract: Large-eddy simulation is used to investigate velocity and pressure fields over arrays of urban buildings, represented by regular cubes. The mean distributions of wall pressure are dominated by the robust flow structures around the cube arrays. On the other hands, the results demonstrate the significant difference in wall pressure distribution between instantaneous snapshots and the mean values. A sequence of snapshots of the instantaneous flow and pressure fields indicates that the discrepancy from the mean fields is derived from the unsteady, three-dimensional turbulent structure of airflow around the cubes. The findings suggest that the transient nature of the turbulence above the urban canopy strongly influences wind-induced natural ventilation in urban buildings.
Keywords: Large-eddy simulation, Natural ventilation, Wind pressure coefficient
Pages: 778 - 785