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首页> 外文期刊>International Journal for Numerical Methods in Fluids >Time-dependent turbulent cavitating flow computations with interfacial transport and filter-based models
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Time-dependent turbulent cavitating flow computations with interfacial transport and filter-based models

机译：基于时间的湍流空化流，基于界面输运和基于过滤器的模型

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摘要

Turbulent cavitating flow computations need to address both cavitation and turbulence modelling issues. A recently developed interfacial dynamics-based cavitation model (IDCM) incorporates the interfacial transport into the computational modelling of cavitation dynamics. For time-dependent flows, it is known that the engineering turbulence closure such as the original k-ε model often over-predicts the eddy viscosity values reducing the unsteadiness. A recently proposed filter-based modification has shown that it can effectively modulate the eddy viscosity, rendering better simulation capabilities for time-dependent flow computations in term of the unsteady characteristics. In the present study, the IDCM along with the filter-based k-ε turbulence model is adopted to simulate 2-D cavitating flows over the Clark-Y airfoil. The chord Reynolds number is Re = 7.0 × 10{sup}5. Two angles-of-attack of 5 and 8° associated with several cavitation numbers covering different flow regimes are conducted. The simulation results are assessed with the experimental data including lift, drag and velocity profiles. The interplay between cavitation and turbulence models reveals substantial differences in time-dependent flow results even though the time-averaged characteristics are similar.
机译：湍流空化流计算需要解决空化和湍流建模问题。最近开发的基于界面动力学的空化模型（IDCM）将界面传输纳入了空化动力学的计算模型。对于随时间变化的流动，众所周知，工程湍流闭合（例如原始k-ε模型）通常会过高地预测涡流粘度值，从而减少不稳定性。最近提出的基于过滤器的修改表明，它可以有效地调制涡流粘度，从而根据非稳定特性为基于时间的流量计算提供了更好的仿真功能。在本研究中，采用IDCM以及基于滤波器的k-ε湍流模型来模拟Clark-Y机翼上的二维空化流。和弦雷诺数为Re = 7.0×10 {sup} 5。进行了5个和8°的两个攻角，这些攻角与覆盖不同流态的多个空化数相关。用包括升力，阻力和速度分布图在内的实验数据评估仿真结果。虽然时间平均特性相似，但空化模型和湍流模型之间的相互作用揭示了随时间变化的流动结果存在实质性差异。

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