風向正面の場合の通風気流に関する予測精度検証と流管分析 : LESと風洞実験による建物通風気流構造の解明に関する研究(第1報)

概要

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Airflow structure of a cross-ventilated model building for normal wind angle case was analyzed using Large Eddy Simulation. Simulated results were in close agreement with experimental observations in view point of flow rate, distribution of velocity vector and turbulence kinetic energy and wind pressure coefficients. Simulated results were analyzed, and it was elucidated that the downfall of the inflow specific to cross-ventilation is strongly affected by pressure gradient due to recirculation on the lower portion on the windward surface of the building. Further analysis was then made to identify shape of streamtube passing through windward opening. Spatial change of static, dynamic and total pressure along the identified streamtube indicated that strong acceleration and deceleration of the airflow does not exert significant change in total pressure at the upstream side of the opening, although energy is exchanged between static and dynamic pressure. This means that flow energy of the streamtube is virtually conserved at the upstream side of the opening, while energy loss occurs after passing through the opening due to the production of turbulence kinetic energy.
社団法人日本建築学会の論文
2002-11-30