Evolution of an Isolated Turbulent Trailing Vortex
Evolution of an Isolated Turbulent Trailing Vortex
复制标题
孤立湍流尾涡的演化
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
S. Girimaji
中科院分区：
文献类型：
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作者：
S. Wallin;S. Girimaji
本文用雷诺平均N-S方程计算了孤立翼尖湍流涡的长时间发展。假设涡流延伸到无穷远，并且在轴向方向上是轴对称和均匀的，并且轴向速度被假设为可以忽略不计。不同湍流模型（从雷诺应力传输模型到涡粘κ-e模型）的有效性已被评估，并与现场测量进行了定性比较。雷诺应力输运模型正确地预测了旋转主导涡核中湍流的强烈抑制和合理的涡衰减率。在核心之外，不同的雷诺应力模型有很大的不同。标准涡粘性κ-e模型对旋转不敏感，因此高估了涡衰减率。严格基于雷诺应力输运模型的显式代数雷诺应力模型的计算表明，代数形式与完整的输运形式相比相当好。然而，重要的是，在推导显式代数模型时调用弯曲流代数假设
The long-time development of an isolated wing-tip turbulent vortex has been studied by Reynolds-averaged Navier-Stokes computations. The vortex is assumed to extend to infinity and to be axisymmetric and homogeneous in the axial direction, and the axial velocity is assumed to be negligible. The validity of different turbulence models, ranging from Reynolds stress transport models to eddy-viscosity κ-e models, has been assessed and qualitative comparisons with field measurements are made. Reynolds stress transport models correctly predict strong suppression of the turbulence in the rotation-dominated vortex core and a reasonable decay rate of the vortex. Outside of the core, the different Reynolds stress models differ significantly. The standard eddy-viscosity κ-e model is insensitive to rotation and, thus, overpredicts the vortex decay rate. Computations using explicit algebraic Reynolds stress models that are strictly based on Reynolds stress transport models show that the algebraic form compares reasonably well with the full transport form. It is, however, important that the curved flow algebraic assumption is invoked when deriving the explicit algebraic model