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首页> 外文期刊>Acta Horticulturae >Using computational fluid dynamics tool to model the internal climate of an Almeria-type greenhouse.
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Using computational fluid dynamics tool to model the internal climate of an Almeria-type greenhouse.

机译：使用计算流体动力学工具来模拟阿尔梅里亚型温室的内部气候。

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摘要

The aim of the present study is to use computational fluid dynamics (CFD) to investigate the effect of wind speed on natural ventilation of an Almeria-type greenhouse, situated in the south of Spain. The complete average air velocity vector field and temperature spatial distribution were numerically calculated in the case of transverse wind, using the commercial software ANSYS/FLOTRAN v 6.1 based in the finite element method. The experiments were carried out in a 42 m long, 3.2 m high and 45 m wide Almeria-type greenhouse equipped with roof and side vents. Both momentum and energy equations were considered and the air flow in the crop cover together with the insect proof screens were described by means of a porous medium approach. Two-dimensional simulations were performed in stationary regime and the standard k- epsilon turbulence model described the turbulent transfers. Air comes in the greenhouse through both windward and the leeward sidewall windows. The temperature distribution showed a side wall-greenhouse centre gradient due to the hot air movement to the roof vent opening and a vertical gradient above the soil surface due to solar energy absorption at the soil level. Maximum air velocity values inside the greenhouse were observed near the openings, whereas air velocity was lowest in the middle of greenhouse. The computational results showed a good agreement with the experimental measurements (mean differences of 0.06 m/second for air velocities, and 0.6 degrees C for air temperatures). CFD can be an optimum tool for developing improved designs with respect to ventilation efficiency.
机译：本研究的目的是使用计算流体力学（CFD）来研究风速对位于西班牙南部的Almeria型温室自然通风的影响。在横向风的情况下，使用基于有限元方法的商业软件ANSYS / FLOTRAN v 6.1对完整的平均风速矢量场和温度空间分布进行了数值计算。实验是在42 m长，3.2 m高和45 m宽的Almeria型温室中进行的，该温室配有屋顶和侧面通风口。考虑了动量和能量方程，并通过多孔介质方法描述了作物覆盖物中的空气流以及防虫网。在固定状态下进行了二维模拟，标准的k-ε湍流模型描述了湍流的传递。空气通过上风窗和下风窗进入温室。由于热空气向屋顶通风口的移动，温度分布显示出侧壁-温室中心的梯度，而由于土壤中太阳能的吸收，温度分布显示出土壤表面上方的垂直梯度。在开口附近观察到温室内部的最大空气速度值，而在温室中间的空气速度最低。计算结果表明与实验测量结果吻合良好（空气速度的平均差异为0.06 m /秒，空气温度的平均差异为0.6摄氏度）。 CFD可以是开发通风效率改进设计的最佳工具。

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