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

作　　者：Kang Liu Hao-ran Wang Yong-can Chen Hui Xie Zhao-Wei Liu 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing,100084,China [2]Sichuan Energy Internet Research Institute,Tsinghua University,Chengdu,610042,China [3]School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu,610500,China

出　　处：《Journal of Hydrodynamics》2024年第4期609-623,共15页水动力学研究与进展B辑（英文版）

基　　金：Project supported by the Key Research and Development Plan Project of China(Grant No.2022YFC3204602);the National Natural Science Foundation of China(Grant No.U21A20157).

摘　　要：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.

关 键 词：Detached eddy simulation(DES)model numerical simulation pressure fluctuation still basin unsteady Reynolds-averaged Navier-Stokes(URANS)model 

分 类 号：TV131.2[水利工程—水力学及河流动力学]