首页|Numerical Study of Flow Features Around Submerged Circular and Square Piles at Flat and Scoured Beds Using OpenFOAM

Numerical Study of Flow Features Around Submerged Circular and Square Piles at Flat and Scoured Beds Using OpenFOAM

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Elucidating the flow features around piles in local scouring processes is crucial for studies of local scouring mechanisms and scour depth estimates.This study details the flow turbulence characteristics of two submerged piles that are determined by solv-ing the Navier-Stokes equations with the improved delayed detached eddy simulation model.This model is verified by comparing experimental and numerical results for hydrodynamic parameters with the literature for both square-crossing piles(SCPs)and circu-lar-crossing piles(CCPs).Original topographies of flat and scoured beds(i.e.,the initial and equilibrium scouring stages)are based on experimental results obtained by the authors in the present paper.SCP and CCP flow features in the scouring process are discussed.The results indicate that during the scouring process,the time-averaged drag coefficient and root mean square(rms)of the lift coeffi-cient increase linearly in the CCP test,while the rms of the lift coefficient in the SCP test decreases linearly.Moreover,the minimum pressure coefficient is always located in the upstream corners in the SCP case but moves from 72.5˚ to 79.5˚ when the scour hole is completely developed in the CCP case.Downward flow behind the pile,which is generated by separated boundary layers above the top face of the pile,can reach the sand bed and turn the separated shear layers into patches of small vortices in the near-wake regions.Thus,the high shear stress zones are mainly at the scour edges under scoured-bed conditions.

flat bedscoured bedlocal scourOpenFOAMbed shear stress

WANG Chaolin、WU Guoxiang、WANG Dianhe、DU Shengtao、ZHANG Zhiyong、JIN Heng、ZHU David Z.、LIANG Bingchen

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Donghai Academy,School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China

Key Laboratory of Estuary and Coast of Zhejiang Province,and Zhejiang Institute of Hydraulics and Estuary,Hangzhou 310020,China

Shandong Provincial Key Laboratory of Ocean Engineering,and College of Engineering,Ocean University of China,Qingdao 266100,China

Shandong Water Conservancy Vocational College,Rizhao 276826,China

School of Mechanical and Energy Engineering,Ningbotech University,Ningbo 315211,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang ProvinceOpen Fund of Key Laboratory of Estuary and Coast of Zhejiang ProvinceNatural Science Foundation of NingboZhejiang Transportation Science and Technology

5230132452001276LQ24E090001ZIHE210052021J0962021064

2024

10.1007/s11802-024-5708-8

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(4)
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