Assessment of Wall Modeling With Adverse Pressure Gradient for High Reynolds Number Separated Flows

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2024-07-15 DOI:10.1007/s10494-024-00562-2

Sajad Mozaffari, Jérôme Jacob, Pierre Sagaut

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Abstract

This paper applies a recently developed approach for modeling turbulence near wall regions within a lattice Boltzmann solver, in combination with a Hybrid RANS/LES turbulence model, to study turbulent separated flows at high Reynolds numbers. To simulate unsteady detached flows on a non-body-fitted Cartesian grid, wall models are employed to estimate the effects of unresolved near-wall turbulence on the overall flow. The article presents the extension of an equilibrium power law wall model to handle adverse pressure gradients and its application in simulating external aerodynamic flows. Hybrid RANS/LES simulations are conducted for two challenging test cases: a 3D NACA-4412 airfoil near stall and a complex Ahmed body configuration. Comparison with a reference simulation involving resolved boundary layers and experimental data demonstrates the strong performance of the wall model, when considering adverse pressure gradients, in simulating turbulent boundary layers under various conditions, ranging from fully attached to mild to high adverse pressure gradients.

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高雷诺数分离流体的反压力梯度壁面建模评估

本文采用最近开发的一种在晶格玻尔兹曼求解器中建立近壁区域湍流模型的方法，结合混合 RANS/LES 湍流模型，研究高雷诺数下的湍流分离流。为了模拟非体拟合笛卡尔网格上的非稳态分离流，采用了壁模型来估计未解决的近壁湍流对整体流动的影响。文章介绍了平衡幂律壁面模型的扩展，以处理不利的压力梯度及其在模拟外部空气动力流中的应用。对两个具有挑战性的测试案例进行了 RANS/LES 混合模拟：一个接近失速的 3D NACA-4412 翼面和一个复杂的 Ahmed 体配置。通过与涉及解析边界层的参考模拟和实验数据进行比较，证明了在考虑不利压力梯度时，壁面模型在模拟各种条件下（从完全附着到轻度到高度不利压力梯度）的湍流边界层时具有强大的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

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.