Investigating the use of 3-component-2-dimensional particle image velocimetry fields as inflow boundary condition for the direct numerical simulation of turbulent channel flow

IF 2.2 3区工程技术 Q2 MECHANICS

Theoretical and Computational Fluid Dynamics Pub Date : 2024-06-05 DOI:10.1007/s00162-024-00697-y

Ezhilsabareesh Kannadasan, Callum Atkinson, Julio Soria

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引用次数: 0

Abstract

Direct numerical simulation (DNS) of turbulent wall-bounded flows requires long streamwise computational domains to establish the correct spatial evolution of large-scale structures with high fidelity. In contrast, experimental measurements can relatively easily capture large-scale structures but struggle to resolve the dissipative flow scales with high fidelity. One methodology to overcome the shortcomings of each approach is by incorporating experimental velocity field measurements into DNS as an inflow boundary condition. This hybrid approach combines the strengths of DNS and experimental measurements, allowing for a reduction in the streamwise computational domain and accelerated development of large-scale structures in turbulent wall-bounded flows. To this end, this paper reports the results of an investigation to establish the impact of limited spatial resolution and limited near-wall experimental inflow data on the DNS of a wall-bounded turbulent shear flow. Specifically, this study investigates the spatial extent required for the DNS of a turbulent channel flow to recover the turbulent velocity fluctuations and energy when experimental inflow data is typically unable to capture fluctuations down to the viscous sub-layer or the smallest viscous scales (i.e. the Kolmogorov scale or their surrogate viscous scale in wall-bounded turbulent shear slows) is used as the inflow to a DNS. A time-resolved numerically generated experimental field is constructed from a periodic channel flow DNS (PCH-DNS) at \(Re_{\tau } =\) 550 and 2300, which is subsequently used as the inflow velocity field for an inflow–outflow boundary conditions DNS. The time-resolved experimental inflow field is generated by appropriately filtering the small scales from the PCH-DNS velocity by integrating over a spatial domain that is representative of a particle image velocimetry interrogation window. This study shows that the recovery of small scales requires a longer domain as the spatial resolution at the inflow decreases with all flow scales recovered and their correct scale-dependent energy is re-established once the flow has developed for 3 channel heights.

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将三分量二维粒子图像测速场作为流入边界条件用于湍流通道流直接数值模拟的研究

湍流壁面流的直接数值模拟（DNS）需要较长的流向计算域，以便高保真地确定大尺度结构的正确空间演化。相比之下，实验测量相对容易捕捉大尺度结构，但难以高保真地解析耗散流尺度。克服两种方法缺点的一种方法是将实验速度场测量结果作为流入边界条件纳入 DNS。这种混合方法结合了 DNS 和实验测量的优势，可以减少流向计算域，加快湍流壁面流中大规模结构的发展。为此，本文报告了一项调查的结果，以确定有限的空间分辨率和有限的近壁实验流入数据对壁界湍流剪切流 DNS 的影响。具体来说，当实验流入数据通常无法捕捉到粘性子层的波动或最小粘性尺度（即科尔莫哥罗夫尺度或壁界湍流剪切慢流中的代粘性尺度）被用作 DNS 的流入量时，本研究调查了湍流通道流 DNS 恢复湍流速度波动和能量所需的空间范围。在 \(Re_{\tau } =\) 550 和 2300 处的周期性通道流 DNS（PCH-DNS）构建了一个时间分辨数值生成的实验场，随后将其用作流入流出边界条件 DNS 的流入速度场。时间分辨实验流入场是通过对粒子图像测速询问窗口的空间域进行积分，对 PCH-DNS 速度中的小尺度进行适当过滤后生成的。这项研究表明，小尺度的恢复需要更长的域，因为流入处的空间分辨率会随着所有流动尺度的恢复而降低，一旦流动发展到 3 个通道高度，就会重新建立正确的尺度相关能量。

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

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.