Variable Resolution in Scale-Resolved Simulations of Turbulence

IF 2 3区工程技术 Q3 MECHANICS

Flow, Turbulence and Combustion Pub Date : 2024-10-03 DOI:10.1007/s10494-024-00591-x

Magnus Carlsson, Stefan Wallin, Sharath Girimaji

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引用次数: 0

Abstract

A new formulation for scale-resolved simulations of turbulence with variable resolution (VR) is proposed. A delayed detached-eddy simulation (DDES) model based on the \(k-\omega\) framework is extended with VR-terms representing the commutation terms arising from variable resolution defined in terms of the DDES length scale. The VR-terms are responsible for the exchange of turbulence kinetic energy between the resolved and unresolved partitioning of the computational representation of turbulent flow. The new formulation is implemented in a general-purpose CFD code and applied on two cases, namely, a mixing shear layer and a wall-mounted hump and have been compared with and combined with the baseline model and two additional grey-area mitigation (GAM) formulations. The proposed method is shown to provide the mechanism for the exchange of energy between unresolved and resolved representation of the flow and to enhance the transition from modelled to resolved turbulence and thus improve the prediction of the resolved Reynolds stresses, development of the vorticity thickness for the shear layer flow and the skin friction recovery length for the hump flow.

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尺度分辨湍流模拟中的可变分辨率

提出了一种新的变分辨率湍流尺度分辨模拟公式。基于\(k-\omega\)框架的延迟分离涡模拟（DDES）模型扩展了vr项，该vr项表示由DDES长度尺度定义的变分辨率引起的换相项。vr项负责湍流计算表示的已解和未解分区之间的湍流动能交换。新公式在通用CFD代码中实现，并应用于两种情况，即混合剪切层和壁挂式驼峰，并与基线模型和另外两种灰色区域缓解（GAM）公式进行了比较和结合。结果表明，该方法为湍流的未解析和已解析表示之间的能量交换提供了机制，增强了从模拟湍流到已解析湍流的过渡，从而改善了对已解析雷诺应力的预测、剪切层流的涡度厚度的发展和驼峰流的表面摩擦恢复长度。

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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.