Numerical investigation of drag coefficients of 2-bundled conductors
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(Published version)
Date
2020
Authors
Xu, H.
Deng, H.
Ma, X.
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Conference paper
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Proceedings of the 9th International Conference on Advances in Steel Structures, ICASS 2018, 2020, pp.1-10
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9th International Conference on Advances in Steel Structures, ICASS 2018 (5 Dec 2018 - 7 Dec 2018 : Hong Kong, China)
Abstract
Drag coefficients of 2-bundled conductors are investigated by numerical simulation. Parametric analysis of meshing scheme, Y+ and time step size are preliminarily conducted with a two-dimensional circular cylinder model. It is found that Y+ should be within 10~15 and time step size should be no larger than 1/250 of vortex shedding period in transient analysis. An elaborate model with the same aerodynamic shape of real conductors is proposed. Drag coefficients of 2-bundled conductors at varied along-wind and across-wind distances are obtained and compared with wind tunnel test results. In tandem arrangement, shielding effect exists at any distance, while in side-by-side arrangement, shielding effect can be ignored when distances are larger than 8 times conductor diameter. Drag coefficients of 2-bundled conductors are much smaller than specified values in codes. It is suggested that shielding effect should be considered in wind-resistance design of ultra-high voltage transmission lines
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Copyright 2018 by The Hong Kong Institute of Steel Construction