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首页> 外文会议>International Symposium on Advanced Technologies and Management Towards Sustainable Greenhouse Ecosystems >Unsteady Computational Study of Airflow Characteristics around an Agricultural Structure Model
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Unsteady Computational Study of Airflow Characteristics around an Agricultural Structure Model

机译：农业结构模型周围气流特征的不稳定计算研究

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Airflow characteristics such as air velocity and pressure are unsteady and undergo random high and low frequency fluctuations, when the flow is turbulent. Turbulent flow is resulted, even in small air velocities, if a structure is present because it impedes the air flow. This complex flow affects the external and the internal environment of agricultural structures. The purpose of this work is the detailed analysis of airflow, in steady and unsteady state, for Reynolds number 700, around an agricultural structure model with arched geometry, which is placed in a wind tunnel. The two-dimensional separated or reattached air flow, around the wind tunnel model is examined with the solution of Navier-Stokes equation, at steady and unsteady state, using the Galerkin finite element method. The Reynolds number is calculated with respect to the model height and the inlet free stream velocity. The different behavior of the airflow predictions around an arched type greenhouse, in steady and in unsteady state, are presented through the comparison of steady state streamlines and time-mean averaged streamlines (Re=700). Also, steady state stream-wise velocity is compared with instantaneous stream-wise velocity and time- mean averaged stream-wise velocity. The time-mean averaged stream-wise velocity, which results from instantaneous values present more detailed predictions than the steady state stream-wise velocity. Moreover, the time-mean averaged streamlines present smaller recirculation length of airflow than the steady state streamlines and thus simulate the airflow around the greenhouse more accurately.
机译：气流特性如空气速度和压力是不稳定的，随机的高和低频波动，当流动湍流时。如果存在结构，因此即使在小的空气速度下，也导致湍流，因为它阻碍了气流。这种复杂的流量会影响农业结构的外部和内部环境。这项工作的目的是对具有拱形几何形状的农业结构模型的雷诺数700的河豚数700的气流进行详细分析，该模型被放置在风洞中。使用Galerkin有限元方法，通过Navier-Stokes方程在稳态和不稳定状态下，通过Galerkin有限元方法检查围绕风洞模型的二维分离或重新连接的空气流。关于模型高度和入口自由流速度计算雷诺数。通过比较稳态流程和时间平均流量（RE = 700），通过比较来呈现拱形类型温室周围的气流预测的不同行为，稳定和不稳定状态。此外，将稳态流速度与瞬时流速度和时分平均流速度进行比较。时间平均平均流速度，其由瞬时值产生比稳态流速度更详细的预测。此外，时间平均平均流线的气流的较小的再循环长度与稳态流线有关，因此更准确地模拟温室周围的气流。

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