Aeroelastic large eddy simulations using vortex methods: unfrozen turbulent and sheared inflow
Aeroelastic large eddy simulations using vortex methods: unfrozen turbulent and sheared inflow
复制标题
使用涡流方法进行气动弹性大涡模拟：未冻结的湍流和剪切流入
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
T. Larsen
中科院分区：
文献类型：
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作者：
E. Branlard;G. Papadakis;M. Gaunaa;G. Winckelmans;T. Larsen
涡流粒子方法应用于风力涡轮机在剪切和湍流流入中的气动弹性模拟。在涡流方法模拟中首次证明了对具有剪切涡度影响的湍流进行大涡模拟的可能性。大多数涡流方法的剪切公式（包括分段公式）均假定冻结剪切。这里表明，这些公式省略了涡度方程中的两个源项。本文还提出了未冻结的剪切模拟。使用依赖于诺依曼到狄利克雷图的新颖方法来解释剪切涡度的无限支持。研究表明，剪切涡度与风力涡轮机的相互作用对尾流形状具有重要影响。获得的尾流形状更接近使用传统计算流体动力学获得的形状：未冻结剪切的结果不具有在使用冻结剪切的涡流方法模拟中观察到的尾流的剧烈向上运动。剪切和湍流涡度的相互作用被证明可以减少否则观察到的湍流衰减。所实现的涡流代码与气动弹性代码耦合，并给出了剪切和湍流流入下的气动弹性模拟示例。
Vortex particles methods are applied to the aeroelastic simulation of a wind turbine in sheared and turbulent inflow. The possibility to perform large-eddy simulations of turbulence with the effect of the shear vorticity is demonstrated for the first time in vortex methods simulations. Most vortex methods formulation of shear, including segment formulations, assume a frozen shear. It is here shown that these formulations omit two source terms in the vorticity equation. The current paper also present unfrozen simulation of shear. The infinite support of the shear vorticity is accounted for using a novel approach relying on a Neumann to Dirichlet map. The interaction of the sheared vorticity with the wind turbine is shown to have an important impact on the wake shape. The obtained wake shape are closer to the one obtained using traditional computational fluid dynamics: Results with unfrozen shear do not have the severe upward motion of the wake observed in vortex methods simulation with frozen shear. The interaction of the shear and turbulence vorticity is shown to reduce the turbulence decay otherwise observed. The vortex code implemented is coupled to an aeroelastic code and examples of aeroelastic simulations under sheared and turbulent inflow are presented.