Turbulent Flow Simulations of the NASA Common Research Model using the Immersed Boundary Method with a Wall Function
Turbulent Flow Simulations of the NASA Common Research Model using the Immersed Boundary Method with a Wall Function
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DOI：
10.2514/6.2017-4235
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
Yoshiharu Tamaki;T. Imamura
中科院分区：
文献类型：
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作者：
Yoshiharu Tamaki;T. Imamura
为了考察基于笛卡尔网格的流动求解器UTCart在三维高雷诺数流动模拟中的能力，对NASA共同研究模型的跨音速湍流流动进行了数值模拟。首先，阐述了UTCart的基本框架。UTCart由一个自动笛卡尔网格生成器和一个可压缩流动解算器组成。流动解算器采用具有湍流壁面函数的浸没边界法来模拟湍流边界层。文中还介绍了UTCart对边界热流的修正和截断距离的计算方法。使用UTCart，中等网格(约5000万个细胞)在43分钟内产生。与网格收敛值相比，巡航条件下的阻力系数在中等网格和精细网格(约为5%)下有24个阻力数(8%)和16个阻力数(5%)差。9700万个细胞)的结果。虽然阻力系数略有被高估，但各分量气动系数都表现出一致的网格收敛趋势。此外，包括大迎角分离在内的定性流动特征与实验数据和常规贴体网格上的计算结果吻合较好。
The transonic turbulent flows around the NASA Common Research Model is simulated to investigate the capability of the Cartesian-grid-based flow solver UTCart in 3D high Reynolds number flow simulations. Firstly, the framework of UTCart is explained. UTCart consists of an automatic Cartesian grid generator and a compressible flow solver. The immersed boundary method with a turbulent wall function is used in the flow solver to reproduce the turbulent boundary layer. The updates for UTCart related to the boundary heat flux and the calculation method for the cutoff distance are also described. Using UTCart, the medium grid (approx. 50 million cells) around the NASA-CRM is generated in 43 minutes. Compared with the grid converged value, the drag coefficient at the cruise condition has 24 drag count (8%) and 16 drag count (5%) differences in the medium and fine grid (approx. 97 million cells) results, respectively. Although the drag coefficient is slightly overestimated, all the component-wise aerodynamic coefficient shows a consistent trend of grid convergence. Furthermore, the qualitative flow features including flow separation at high angles of attack show a fair agreement with the experimental data and the computational results on the conventional body-fitted grids.