面向工业航空应用的高效混合ranss - les

IF 2.4 3区 工程技术 Q3 MECHANICS
Axel Probst, Elrawy Soliman, Silvia Probst, Matthias Orlt, Tobias Knopp
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引用次数: 0

摘要

在混合ranss - LES计算中,降低网格分辨率要求的三种互补方法,即(a)使用壁函数,(b)应用局部嵌入的WMLES而不是全局WMLES,以及(c)在LES区域的局部网格适应,在不同的测试案例中进行了评估,直至与工业相关的航空流。在此背景下,提出了一种基于二阶精确非结构化可压缩有限体积求解器的嵌入式WMLES方法的有针对性的改进和对一般三维几何形状的扩展。对于应用于NASA驼峰流和CRM-HL飞机配置的壁面函数和嵌入式WMLES,相对于相应的参考模拟,计算效率得到了显著提高,而与实验相比,预测精度的损失可以限制在可接受的水平。采用基于局部解析湍流动能的细化指标,将网格自适应应用于NASA驼峰流和NACA0021失速工况,与全局细化的固定网格计算相比,结果甚至有所改善,但由于迭代细化和平均过程带来的计算开销尚未包括在本研究中。与各自的参考网格相比,节省的网格点在1/3到2/3之间,所有考虑的方法都有可能实现更有效的混合ranss - les复杂流动模拟,尽管它们通过组合积累的潜力仍有待探索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Towards Efficient Hybrid RANS–LES for Industrial Aeronautical Applications

Three complementary approaches for reducing the grid-resolution requirements in hybrid RANS–LES computations, namely (a) the use of wall functions, (b) the application of locally embedded WMLES instead of global WMLES, as well as (c) local grid adaptation in LES regions, are assessed for different test cases up to an industry-relevant aeronautical flow. In this context, targeted improvements and an extension to general 3D geometries of an embedded WMLES method in a second-order accurate, unstructured compressible finite-volume solver are presented. For the wall functions and the embedded WMLES, which are applied to the NASA hump flow and the CRM-HL aircraft configuration, significant computational efficiency gains relative to corresponding reference simulations are demonstrated, while the loss of predictive accuracy compared to experiments can be limited to acceptable levels. Using a refinement indicator based on the locally resolved turbulent kinetic energy, the grid adaptation applied to the NASA hump flow and the NACA0021 at stall conditions yields partly even improved results compared to computations on globally-refined fixed grids, but the computational overhead due to the iterative refinement and averaging process was not yet included in this study. With grid-point savings ranging between 1/3 and more than 2/3 of grid points compared to respective reference meshes, all considered methods offer potential towards more efficient hybrid RANS–LES simulations of complex flows, although their accumulated potential through combination still needs to be explored.

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来源期刊
Flow, Turbulence and Combustion
Flow, Turbulence and Combustion 工程技术-力学
CiteScore
5.70
自引率
8.30%
发文量
72
审稿时长
2 months
期刊介绍: Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.
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