Refined Simulation Study of Hydrodynamic Properties and Flow Field Characteristics around Tandem Bridge Piers under Ice-Cover Conditions

Author:

Gao Pengcheng1ORCID,Mou Xianyou2,Ji Honglan2ORCID,Gao Feng1,Su Haitao1,Gao Lina1,Shang Zhiqiang1,Chang Lei3,Che Mingnan3

Affiliation:

1. Inner Mongolia Institute of Water Resources Research, Hohhot 010018, China

2. College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China

3. Inner Mongolia Autonomous Region Surveying and Mapping Geographic Information Center, Hohhot 010018, China

Abstract

Ice cover is a common phenomenon in rivers in cold regions during the winter freeze-up period, leading to the formation of unsteady bypass structures around underwater piers. To reveal the variation law of the flow field around a pier under ice, a numerical calculation method is proposed to obtain the spatial and temporal characteristics of the fluid flow environment around the pier. The verification of flow conditions and convergence showed that the numerical model constructed in this study is reliable and can meet research requirements. The simulation results showed that the ice-cover condition considerably impacted the extent of a scour hole, and in the horizontal plane Z of −0.02 m, the lateral influence of the scour hole was approximately 2.6 times the diameter of the pier, which was approximately 42% wider than that of a scour hole under open-flow conditions; in the area on the side of the pier, there was a peak in longitudinal section y/D of −0.6, and the relative turbulence intensity was 0.4 and 0.51 under open-flow and ice-cover conditions, respectively, indicating that ice cover made the peak more significant in the area.

Funder

National Natural Science Foundation of China

Major Special Project of Inner Mongolia Autonomous Region Department of Science and Technology

Publisher

MDPI AG

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