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首页> 外文会议>AIAA computational fluid dynamics conference;AIAA aviation forum >A Turbulent Low-Speed Preconditioner for Unsteady Flows About Wind Turbine Airfoils
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A Turbulent Low-Speed Preconditioner for Unsteady Flows About Wind Turbine Airfoils

机译：一种用于风轮机翼非定常流动的湍流低速预处理器

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摘要

A harmonic balance method is used to study the unsteady flows at low-speed regimes typically seen for wind turbines. The frequency-domain technique is applied to the Reynolds-averaged Navier-Stokes governing system of equations with the Spalart-Allmaras turbulence model. The convergence, stability and accuracy of the compressible solver is improved via a fully coupled viscous preconditioning designed for low speed flows that fall in the essentially incompressible flow regime. The viscous preconditioner couples the Navier-Stokes equations to the turbulence model through the correct implementation of the preconditioning matrix and the subsequently matrix-valued artificial dissipation term. Finally, the viscous low-speed preconditioning is enhanced with a mixed-mechanism that would increase the stability and improve the convergence of the harmonic balance solver used for the simulation of unsteady periodic flows.
机译：谐波平衡法用于研究通常看过风力涡轮机的低速制度的不稳定流。频域技术应用于具有Spalart-Allmaras湍流模型的reynolds平均Navier-Stokes系统。可压缩求解器的收敛，稳定性和精度通过设计用于低速流的完全耦合的粘性预处理，该低速流动下降在基本上不可压缩的流动状态下。粘性前提例通过预处理矩阵的正确实现和随后的矩阵值的人工耗散项来将Navier-Stokes方程耦合到湍流模型。最后，利用混合机构增强了粘性低速预处理，其可以提高稳定性，提高用于模拟不稳定周期流的谐波平衡求解器的收敛性。

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