三维湍流时均场中能量输运可视化

Visualization of Energy Transports in 3D Time-averaged Turbulent Flows

从三维湍流时均场中单位体积流体携带总能量的公式出发,推导得到能流密度矢量,进而实现三维湍流时均场中能量输运轨迹可视化,并将能量输运迹线用于三维方腔对流传热、流固耦合湍流传热及置换通风房间湍流对流传热问题的研究。研究结果表明:能量输运迹线可直观展示三维湍流时均场中复杂对流传热问题的能量输运轨迹,揭示能量输运规律,是研究对流传热一种有用的新方法。

Started from the equation of the energy contained within a unit volume of fluid, the energy flux density vectors in three-dimensional time-averaged turbulent flows were derived. Consequently, energy transport trajectories could be visualized by energy transport pathlines. Furthermore, energy transport pathlines were applied in the study of convective heat transfer within a cube, fluid-solid conjugated turbulent convective heat transfer and turbulent convective heat transfer in rooms with displacement ventilation systems. The results show that energy transport pathlines are useful in the study of convective heat transfer since they can intuitively show trajectories of energy transport and reveal energy transport patterns of complicated convective heat transfer in three-dimensional time-averaged turbulent flows.