[1] ZHAO Shuang, ZHANG Xianhong, ZHANG Chengtao, YAN Zhitao, et al. LES of geometric eccentricity effects on flow field and aerodynamic forces of T-shaped towers [J]. Journal of Southeast University (English Edition), 2026, 42 (2): 206-215. [doi:10.3969/j.issn.1003-7985.2026.02.007]

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LES of geometric eccentricity effects on flow field and aerodynamic forces of T-shaped towers()

几何偏心对T形塔流场和气动力影响的大涡模拟

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

42

Issue:

2026 2

Page:

206-215

Research Field:

Publishing date:

2026-05-29

Info

Title:

LES of geometric eccentricity effects on flow field and aerodynamic forces of T-shaped towers

几何偏心对T形塔流场和气动力影响的大涡模拟

Author(s):

ZHAO Shuang^1,2, ZHANG Xianhong¹, ZHANG Chengtao¹, YAN Zhitao^1,2

1.School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China
2.Chongqing Construction Science Research Institute Co., Ltd., Chongqing 400016, China

赵爽^1,2, 张先洪¹, 张成涛¹, 晏致涛^1,2

1.重庆科技大学土木与水利工程学院, 重庆 401331
2.重庆市建筑科学研究院有限公司, 重庆 400016

Keywords:

geometric eccentricity;  T-shaped towers;  aerodynamic forces;  flow field characteristics

几何偏心;  T形塔;  气动力;  流场特征

PACS:

TU312.1

DOI:

10.3969/j.issn.1003-7985.2026.02.007

Abstract:

To investigate the aerodynamic performance of geometrically eccentric structures, wind tunnel testing and numerical simulations were employed to examine the flow field characteristics and tri-component aerodynamic forces of T-shaped towers with varying geometric eccentricities. A mathematical model for their generalized force spectra was established. The reliability of the numerical simulation method was validated by comparing the lift, drag, and torque coefficients obtained from wind tunnel experiments with the numerical results. Subsequently, the influence of geometric eccentricity on wind pressure distribution, vortex shedding characteristics, and turbulent kinetic energy distribution was analyzed. Using random vibration theory, a normalized formula for the full-tower force spectrum of the T-shaped tower was derived through nonlinear fitting of numerical simulation data. The results indicate that with increasing eccentricity, the vortex shedding of the structure becomes more complex, with a bias toward the eccentric side. Its wake morphology undergoes distortion and deformation, exhibiting vertical extensibility and leading to peak wind pressure occurring at the longer cross-arm. Furthermore, the torque coefficient demonstrated the highest sensitivity to eccentricity variations. A 50% increase in eccentricity resulted in a 99.7% increase in the torque coefficient.

为研究几何偏心结构的气动性能,采用风洞试验与数值模拟方法,对不同几何偏心条件下T形塔的流场特性与气动三分力进行分析,并建立了相应的广义力谱数学模型。通过对比风洞试验与数值模拟获得的升力、阻力和扭矩系数,验证数值模拟方法的可靠性,并进一步分析了几何偏心对风压分布、涡脱特性及湍动能分布的影响。基于随机振动理论,通过对数值模拟结果的非线性拟合,得到T形塔整塔力谱的归一化公式。结果表明:偏心距越大,结构涡脱现象越复杂且向偏心侧偏移;尾流形态发生扭曲变形,呈现竖向延展特性,导致峰值风压出现在较长横臂处;扭矩系数对偏心变化的敏感度最高,偏心率增加50%时扭矩系数增加99.7%。

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Memo

Memo:

Received: 2025-06-05; Revised: 2025-10-15.
Biographies: ZHAO Shuang (1989—), male, doctor, lecturer; YAN Zhitao (corresponding author), male, doctor, professor, yanzhitao@cqu.edu.cn.
Foundation items: The China Postdoctoral Science Foundation (No.2023T160767), the Natural Science Foundation of Chongqing Municipality (No.CSTB2023NSCQ-MSX0751).
Citation: ZHAO Shuang, ZHANG Xianhong, ZHANG Chengtao, et al. LES of geometric eccentricity effects on flow field and aerodynamic forces of T-shaped towers[J]. Journal of Southeast University (English Edition), 2026, 42(2): 206-215. DOI: 10. 3969/j. issn. 1003-7985. 2026. 02. 007.

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