封闭空间内的气流数值模拟

Numerical Simulation of Airflows in Unfurnished Room

研究了室内气流的数值模拟模型,并证明CFD技术可作为室内空气品质和研究人体舒适性的有利工具.选用低雷诺数κ-ε模型模拟湍流传递,求解了时间平均的质量守恒方程、动量守恒方程和能量守恒方程、并将标准流动的解与实验研究所得的解相比较以验证计算代码的实用性.最后,模拟了假定空房间中的气流.模拟结果表明,CFD技术比分析模型和实验模型能更详尽地模拟出速度场和温度场的各种信息.

The numerical modeling of room airflows is considered in this paper. It also illustrates the usefulness of computer fluid dynamics (CFD) as a tool for IAQ researches. The time-averaged equations for the conservation of mass, momentum, and energy are solved. A low Reynolds num-ber κ-εe modei is used to simulate the turbulent transport. The code was validated by comparing it with benchmark data for buoyancy-driven cavity flows. The airflows in unfurnished room were then simulated. The use of computational fluid dynamics enables the velocity and temperature fields to be investigated in significantly greater detail than is possible with either analytical or ex-perimental models.