In the present study, two advanced detached eddy simulation (DES) approaches, shear‐layer‐adapted delayed DES and zonal DES in mode II, which are known to help transition from RANS to LES mode, are employed in various flow problems in conjunction with a high‐order finite volume solver. The numerical scheme, being only applicable on structured grids, has low‐dissipation and low‐dispersion features. Such features benefit mostly in the LES mode, minimizing the interference of numerical diffusion with subgrid eddy viscosity. First, corresponding subgrid models are validated via decaying homogeneous turbulence benchmark case. Then, a channel flow problem is chosen to examine these models in attached flow situations. Finally, flow around an airfoil at low Reynolds number is solved using the shear‐layer‐adapted delayed DES approach only, in an aim to obtain trailing‐edge noise spectrum at an observer location. Despite some log‐layer mismatch over turbulent boundary layers, which is typical of most DES methods, the combined application of high‐resolution numerical method and advanced DES approaches, which are implemented on a stabilized Spalart‐Allmaras turbulence model, shows merit in resolution of turbulence in regions of interest.

中文翻译：

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通过使用高阶有限体积求解器，获得两种独立的涡流模拟方法的经验

在本研究中，两种先进的分离涡模拟（DES）方法，即剪切层自适应延迟DES和模式II下的纬向DES（已知可帮助从RANS过渡到LES模式）与各种流动问题结合使用。高阶有限体积求解器。该数值方案仅适用于结构化网格，具有低耗散和低散布的特征。此类功能主要在LES模式下受益，可最大程度地减少数值扩散对亚网格涡流粘度的干扰。首先，通过衰减均匀湍流基准案例验证相应的子网格模型。然后，选择通道流动问题以在附加流动情况下检查这些模型。最后，仅使用适应于剪切层的延迟DES方法解决了低雷诺数的翼型周围的流动，目的是在观察者位置获得后缘噪声频谱。尽管在湍流边界层上存在一些对数层失配（这是大多数DES方法的典型特征），但在稳定的Spalart-Allmaras湍流模型上实现的高分辨率数值方法和高级DES方法的组合应用仍显示出以下优点：感兴趣区域的湍流。