High-Fidelity Simulations and Low-Order Modeling of a Rapidly Pitching Plate
High-Fidelity Simulations and Low-Order Modeling of a Rapidly Pitching Plate
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快速投球板的高保真模拟和低阶建模
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
Chengjie Wang
中科院分区：
文献类型：
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作者：
Je;D. Eldredge;Chengjie Wang
雷诺数1000和低阶无粘点涡模型的数值模拟。系统地改变俯仰角速度和轴线位置，并考察它们对所产生的气动力的影响。结果表明，上仰过程中产生的最大升力和阻力都随俯仰角速度的增加而近似线性地增加，但随着俯仰轴后移，增加率减小。此外，最大升阻比随着俯仰角速度的增加趋于饱和，渐近值随着轴向后移动而减小。将低阶无粘Brown{Michael}模型预测的力与高阶结果进行了比较。虽然点涡模型倾向于过度预测力的两个分量，但实现了良好的定性一致。将模型得到的升力分解为惯性反力和环流力，并考察了它们的相对贡献。
numerical simulations at Reynolds number 1000 and a low-order inviscid point vortex model. The pitching rate and axis position are systematically varied, and their eect on the generated aerodynamic forces is inspected. It is found that the maximum lift and drag developed during the pitch-up both increase nearly linearly with increasing pitch rate, though the rates of increase diminish as the pitching axis is moved aft. Furthermore, the maximum lift-to-drag ratio tends to saturate with increasing pitch rate, with the asymptotic value decreasing as the axis is moved aft. The forces predicted by the low-order inviscid Brown{Michael model are compared with the high-delity results. Good qualitative agreement is achieved, though the point vortex model tends to over-predict both components of force. The lift force obtained from the model is decomposed into inertial reaction and circulatory components, and their relative contributions are inspected.