本研究使用利用商業套裝軟體Ansys CFX探討陣風條件下之直立葉片式垂直軸風力發電機之流場及其翼面受力情形。吾人使用ANSYS CFX高階數值方法，採用剪應力傳輸(Shear Stress Transport)紊流模型與分離渦流模擬法DES（Detached Eddy Simulation）來模擬風車流場。計算革點由四邊形(Quadrilateral mesh)/六面稜柱(Prism Meshing)組成, 葉片在周期性周期性旋轉條件下求解非穩態不可壓縮納維－斯托克斯方程式（Navier-Stokes equations）陣風模式依IEC61400-1定義陣風模式。
首先模擬圓柱繞流之流場模擬，以了解邊界條件設定、網格建構及流場之設定影響，並與相關之數值研究及實驗數據比較進行評估。接著模擬NACA0015翼剖面之流場，對不同攻角下是否有失速(stall)情形做對比，最後使用NACA0022之直立葉片式模型進行模擬，並與相關角動量之實驗值做比較。研究不同位置及尖速比下,陣風對定速旋轉垂直軸風力發電機之受力影響,陣風模式依IEC61400-1定義陣風模式，在不同陣風係數下，對扇葉受力及力矩之影響，並對模擬結果進行分析。

This research uses commercial software,Ansys CFX,to investigate the flow-field for a Straight-Blade VAWT under gust conditions. In the ANSYS CFX,we use a high resolution scheme and shear stress transport turbulence model with translational periodicity and detached eddy simulation to simulate the flow-field of VAWT with gust flow.The grid system is a combinations of quadrilateral / prism meshing.The incompressible Navier - Stokes equations are solved.The gust model is defined by the IEC61400-1.
First,the flow around a circular cylinder is simulated to understand the setting affects of boundary conditions and grid construction in the flow field.The numerical researchs are compared with the experimental data.Then the flow over an NACA0015 aerofoil is simulated under different angles of attack.Finally,the flow field past a VAWT with NACA0022 airfoil is simulated. We Investigate the force behavior of VAWT under a gust in flow. We sutudy the force and momentum in the airfoil under different gust model.

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