中文摘要：

一个非线性的旋涡粘性模型(NLEVM ) 和可伸缩的混合雷纳兹平均 Navier-Stokes/ 大旋涡模拟(RANS/LES ) 策略被开发改进旋涡粘性模型(EVM ) 的能力模仿展示分离和不稳定的运动的复杂流动。学习 NLEVM 的表演，在 S809 机翼附近的数字模拟被执行，当大分离发生时，结果证明 NLEVM 更好表现。在三角形的柱体附近的流动的计算结果证明 NLEVM 能改进流动地的精确到一些程度，但是错误仍然是可观的，并且小骚乱组织不能清楚地作为 EVM 被捕获。而可伸缩的混合 RANS/LES 模型在解决上基于 NLEVM 是相当有效的，狂暴的结构和罐头给流动领域的更令人满意的预言。

英文摘要：

A nonqinear eddy viscosity model （NLEVM） and a scalable hybrid Reynolds averaged Navier-Stokes/large eddy simula- tion （RANS/LES） strategy are developed to improve the capability of the eddy viscosity model （EVM） to simulate complex flows featuring separations and unsteady motions. To study the performance of the NLEVM, numerical simulations around S809 airfoil are carried out and the results show that the NLEVM performs much better when a large separation occurs. Calculated results of the flow around a triangular cylinder show that the NLEVM can improve the precision of the flow fields to some extents, but the error is still considerable, and the small turbulence structures can not be clearly captured as the EVM. Whereas the scalable hybrid RANS/LES model based on the NLEVM is fairy effective on resolving the turbulent structures and can give more satisfactory predictions of the flow fields.