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Title: Modeling of Water Film Formation on a Stay-Cable

Abstract

With the increasing popularity of cable-stayed bridges in the past few decades, longer spans are being constructed using ever-longer stay cables. Under certain conditions, especially during construction, and wind and rain-wind events, the cables of cable-stayed bridges may undergo large amplitude vibrations. This type of vibration has been of concern to researchers and engineers because large amplitude vibration can induce excessive stresses and therefore threaten the safety and integrity of bridge structures. Figure 1-1 presents an example of a stay cable bridge structure, The Cooper River Bridge. Many countermeasures for the wind-rain induced vibrations have been developed to decrease the amplitude of the vibrations and consequently, the fatigue of the cables. One of the methods is to install helical fillets on the cable surface. A sketch of a cable with two fillets wrapped around it is shown in Figure 1-2. The main objective of the present study is to develop and test computational methodologies, with the use of computational fluid dynamics (CFD), that model the interaction of rain with stay cables including: the formation of water film, development of rainwater rivulets, and rivulet behavior under various conditions with and without wind. Interaction of water with cables with and without filletsmore » is analyzed, and results are presented in this report. This study is divided into two parts. The first part of this study, Section 4, explores methods of modeling water film formation and flow on cables. A series of simulations using the Reynolds averaged Navier-Stokes equations turbulence model (RANS) and large eddy simulation (LES) model are performed to analyze water film formation and flow on a cable using the fluid film model in STARCCM+ [(b)1]. Various methods of setting up initial and boundary conditions are tested, especially boundary conditions for introducing rain into the domain. The second part of the study, Section 5, explores upper rivulet formation in the presence of wind, based on the findings from the first part of the study. In that section, LES simulation with the Volume Of Fluid model for the free surface is used. Also, various results for cases with and without water film on the cable are presented and compared.« less

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
U.S. Department of Transportation - Federal Highway Administration
OSTI Identifier:
1557626
Report Number(s):
ANL-19/26
154600
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Sinha, N., Sitek, M. A., and Lottes, S. A. Modeling of Water Film Formation on a Stay-Cable. United States: N. p., 2019. Web. doi:10.2172/1557626.
Sinha, N., Sitek, M. A., & Lottes, S. A. Modeling of Water Film Formation on a Stay-Cable. United States. doi:10.2172/1557626.
Sinha, N., Sitek, M. A., and Lottes, S. A. Thu . "Modeling of Water Film Formation on a Stay-Cable". United States. doi:10.2172/1557626. https://www.osti.gov/servlets/purl/1557626.
@article{osti_1557626,
title = {Modeling of Water Film Formation on a Stay-Cable},
author = {Sinha, N. and Sitek, M. A. and Lottes, S. A.},
abstractNote = {With the increasing popularity of cable-stayed bridges in the past few decades, longer spans are being constructed using ever-longer stay cables. Under certain conditions, especially during construction, and wind and rain-wind events, the cables of cable-stayed bridges may undergo large amplitude vibrations. This type of vibration has been of concern to researchers and engineers because large amplitude vibration can induce excessive stresses and therefore threaten the safety and integrity of bridge structures. Figure 1-1 presents an example of a stay cable bridge structure, The Cooper River Bridge. Many countermeasures for the wind-rain induced vibrations have been developed to decrease the amplitude of the vibrations and consequently, the fatigue of the cables. One of the methods is to install helical fillets on the cable surface. A sketch of a cable with two fillets wrapped around it is shown in Figure 1-2. The main objective of the present study is to develop and test computational methodologies, with the use of computational fluid dynamics (CFD), that model the interaction of rain with stay cables including: the formation of water film, development of rainwater rivulets, and rivulet behavior under various conditions with and without wind. Interaction of water with cables with and without fillets is analyzed, and results are presented in this report. This study is divided into two parts. The first part of this study, Section 4, explores methods of modeling water film formation and flow on cables. A series of simulations using the Reynolds averaged Navier-Stokes equations turbulence model (RANS) and large eddy simulation (LES) model are performed to analyze water film formation and flow on a cable using the fluid film model in STARCCM+ [(b)1]. Various methods of setting up initial and boundary conditions are tested, especially boundary conditions for introducing rain into the domain. The second part of the study, Section 5, explores upper rivulet formation in the presence of wind, based on the findings from the first part of the study. In that section, LES simulation with the Volume Of Fluid model for the free surface is used. Also, various results for cases with and without water film on the cable are presented and compared.},
doi = {10.2172/1557626},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}

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