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基于Fluent软件平台,采用混合网格划分,选用Realizable k-ε湍流模型,对某自然通风器的风场进行三维数值模拟研究。选择0°、45°、90°、135°和180°等风向,每个风向考虑39m/s风速,此外对0°、180°两风向还考虑了57m/s风速。通过模拟,得到了主通风器导流片的风载体型系数。经计算,0°,180°两个风向的风场对导流片抗风影响较大,基于此对这两个风向的计算结果进行了详细分析。在数值模拟过程中引入多孔介质阶跃模型模拟次通风器导流片,在降低模型复杂程度和减少计算量的同时,保证了数值模拟结果的可靠性。分析表明,基于数值模拟方法得到的风载体型系数在不同风向和风速的情况下呈现一定的变化规律性,为确定自然通风器类结构的风载体型系数提供了合理依据。
Based on the Fluent software platform, a hybrid mesh was used and a Realizable k-ε turbulence model was selected to study the 3D numerical simulation of the wind field of a natural ventilator. Choose 0 °, 45 °, 90 °, 135 ° and 180 ° and other wind directions, each wind direction 39m / s wind speed to consider, in addition to 0 °, 180 ° two wind direction also considered 57m / s wind speed. Through the simulation, the wind carrier coefficient of the main ventilator guide was obtained. It is calculated that wind fields at 0 ° and 180 ° have a greater influence on wind resistance of the deflector, and the results of these two wind directions are analyzed in detail. In the process of numerical simulation, the porous medium step model was used to simulate the secondary deflector deflector, which not only reduced the complexity of the model and reduced the computational load, but also ensured the reliability of numerical simulation results. The analysis shows that the wind load coefficient obtained by the numerical simulation method shows a certain regularity of variation under different wind directions and wind speeds, which provides a reasonable basis for determining the wind load coefficient of the natural ventilator.