Loosely coupled under-resolved LES/RANS simulation augmented by sparse near-wall measurement

IF 2.2 3区工程技术 Q2 MECHANICS

Theoretical and Computational Fluid Dynamics Pub Date : 2024-12-08 DOI:10.1007/s00162-024-00725-x

Pasha Piroozmand, Oliver Brenner, Patrick Jenny

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Abstract

We investigate scenarios, where only sparse wall shear stress measurements are available, while accurate wall shear stress and velocity profiles are sought. Applying discrete adjoint-based data assimilation, with only near-wall measurements, accurate wall shear stress profiles are achieved at the expense of unrealistic velocity profiles. We therefore add and employ internal reference data generated by performing a relatively cheap hybrid simulation. We modified the dual-mesh hybrid LES/RANS framework recently proposed by Xiao and Jenny (J Comput Phys 231(4):1848–1865, 2012, https://doi.org/10.1016/j.jcp.2011.11.009) by loosely coupling under-resolved LES in the interior with steady RANS near the walls. The framework was developed in OpenFOAM and tested for flow over periodic hills with Re = 10,595. Results show that the devised framework outperforms conventional dual-mesh hybrid LES/RANS and standalone sparse wall-data assimilated RANS models. Graphical abstract Horizontal mean velocity component \(U_{1}\) (top plot) and wall shear stress (friction coefficient \(C_{f}\)) profiles at the lower wall (bottom plot) obtained with S-RANS and assimilation of sparse wall shear stress data

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稀疏近壁测量增强的松散耦合低分辨率LES/RANS模拟

我们研究的情况下，只有稀疏的墙剪应力测量可用，而准确的墙剪应力和速度分布是寻求。应用基于离散伴随的数据同化，仅通过近壁测量，就可以获得精确的壁面剪应力曲线，但代价是无法获得不切实际的速度曲线。因此，我们添加并使用通过执行相对便宜的混合模拟生成的内部参考数据。我们改进了Xiao和Jenny最近提出的双网格混合LES/RANS框架（J computer Phys 231(4): 1848-1865, 2012, https://doi.org/10.1016/j.jcp.2011.11.009），通过松散耦合内部的低分辨率LES和靠近墙壁的稳定RANS。该框架是在OpenFOAM中开发的，并在Re = 10,595的周期性山丘上进行了流动测试。结果表明，所设计的框架优于传统的双网格混合LES/RANS和独立稀疏墙数据同化的RANS模型。利用S-RANS和稀疏壁面剪应力数据同化得到的水平平均速度分量\(U_{1}\)（上图）和下壁面剪应力（摩擦系数\(C_{f}\)）剖面图（下图）

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来源期刊

Theoretical and Computational Fluid Dynamics 物理-力学

CiteScore

5.80

自引率

2.90%

发文量

审稿时长

>12 weeks

期刊介绍： Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.