室内空气流动的直接数值模拟

Direct Numerical Simulation of Indoor Air Flow

应用直接数值模拟(DNS)技术,采用高分辨率的网格,计算了一个三维非定常的室内通风流场.对比激光多普勒仪器的测量数据,DNS显示了优异的预测能力,特别是准确地捕捉速度峰值的能力.其计算结果能够详细地描述出室内空气湍流流动的演变和细微的漩涡结构,为设计室内通风环境和研究室内污染物扩散传输提供了强有力的工具.

This paper applied direct numerical simulation （DNS） with considerably fine grids to calculate a three-dimensional unsteady indoor ventilation flow case. Compared with the results of LDA （Laser Doppler Anemometry） measurements, the DNS shows excellent prediction abilities, especially in capturing the peak velocity values. The calculated results can give the detailed development of the indoor air turbulent flow and the structure of fine eddies, which provides a powerful tool for indoor ventilation design and studying the dispersion and transportation of indoor pollutants.