Comparison of DES and URANS: Estimation of fluctuating pressure from URANS simulations in stilling basins

IF 2.5 3区 工程技术 Journal of Hydrodynamics Pub Date : 2024-09-27 DOI:10.1007/s42241-024-0055-1
Kang Liu, Hao-ran Wang, Yong-can Chen, Hui Xie, Zhao-Wei Liu
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Abstract

This study conducts a comparative analysis between detached eddy simulation (DES) and Unsteady Reynolds-averaged Navier-Stokes (URANS) models for simulating pressure fluctuations in a stilling basin, aiming to assess the URANS mode’s performance in modeling pressure fluctuation. The URANS model predicts accurately a smoother flow field and its time-average pressure, yet it underestimates the root mean square of pressure (RMSP) fluctuation, achieving approximately 70% of the results predicted by DES model on the bottom floor of the stilling basin. Compared with DES model’s results, which are in alignment with the Kolmogorov −5/3 law, the URANS model significantly overestimates low-frequency pulsations, particularly those below 0.1 Hz. We further propose a novel method for estimating the RMSP in the stilling basin using URANS model results, based on the establishment of a quantitative relationship between the RMSP, time-averaged pressure, and turbulent kinetic energy in the boundary layer. The proposed method closely aligns with DES results, showing a mere 15% error level. These findings offer vital insights for selecting appropriate turbulence models in hydraulic engineering and provide a valuable tool for engineers to estimate pressure fluctuation in stilling basins.

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DES 与 URANS 的比较:通过 URANS 模拟估算静水池中的波动压力
本研究对脱离涡模拟(DES)和非稳态雷诺平均纳维-斯托克斯(URANS)模型模拟静止水池中的压力波动进行了对比分析,旨在评估 URANS 模式在压力波动建模方面的性能。URANS 模型准确预测了更平滑的流场及其时间平均压力,但低估了压力均方根(RMSP)波动,在静压池底层的预测结果约为 DES 模型的 70%。DES 模型的结果符合 Kolmogorov -5/3 定律,与之相比,URANS 模型明显高估了低频脉动,尤其是 0.1 Hz 以下的脉动。我们进一步提出了一种利用 URANS 模型结果估算静止盆中 RMSP 的新方法,该方法基于边界层中 RMSP、时间平均压力和湍流动能之间定量关系的建立。所提出的方法与 DES 的结果非常吻合,误差仅为 15%。这些发现为水利工程中选择合适的湍流模型提供了重要启示,并为工程师估算静压池压力波动提供了宝贵工具。
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来源期刊
自引率
12.00%
发文量
2374
审稿时长
4.6 months
期刊介绍: Journal of Hydrodynamics is devoted to the publication of original theoretical, computational and experimental contributions to the all aspects of hydrodynamics. It covers advances in the naval architecture and ocean engineering, marine and ocean engineering, environmental engineering, water conservancy and hydropower engineering, energy exploration, chemical engineering, biological and biomedical engineering etc.
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