CFD Simulations and Analyses for Bridge-Scour Development Using a Dynamic-Mesh Updating Technique

Xiong, Wen; Cai, C.S.; Kong, Bo; Kong, Xuan

doi:10.1061/(asce)cp.1943-5487.0000458

Cited by 51 publications

(15 citation statements)

References 23 publications

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“…While it is very difficult to satisfy this requirement, the height of the first grid should be in the logarithmic layer and valid results can still be guaranteed. In the literature, y+ is desirable to be set in a range from 11.6 to 300 in order to achieve an acceptable accuracy in bridge engineering [29,30]. In the current study, the range of y+ is from 30 to 50 in order to ensure that reliable pressure field and velocity field around the near wall regions can be obtained and to avoid the extensive computation.…”

Section: Verification Of the Wave Forces On A Bridge Deckmentioning

confidence: 98%

Numerical simulations of lateral restraining stiffness effect on bridge deck–wave interaction under solitary waves

Cai

2015

Engineering Structures

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Section: Verification Of the Wave Forces On A Bridge Deckmentioning

confidence: 98%

Numerical simulations of lateral restraining stiffness effect on bridge deck–wave interaction under solitary waves

Cai

2015

Engineering Structures

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“…In order to quantitatively describe the difference between the simulated and measured natural frequencies, a new parameter is proposed in Equation (13). (13) where D 1 = difference between the simulated and measured natural frequencies; f q sim and f q mea = simulated and measured natural frequencies of the qth vibration mode, respectively; and q = concerned orders, which refer to the orders of the scour-insensitive vibration modes. It is noted that other forms of D 1 , i.e., Root-Mean-Squared-Error (RMSE) and the Nash-Sutcliffe Efficiency, can also be used in Equation 13, which should provide the same iteration results.…”

Section: Identification Of Soil Stiffnessmentioning

confidence: 99%

“…An analytical solution or numerical simulation is the common way to predict the bridge scour depth due to its practical conveniences [8][9][10][11][12][13][14]. Along with continuous scour experiments, these formulas for calculation are similar to the real situations [15,16].…”

Section: Introductionmentioning

confidence: 99%

Bridge Scour Identification and Field Application Based on Ambient Vibration Measurements of Superstructures

Xiong

Cai

Kong

et al. 2019

JMSE

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A scour identification method was developed based on the ambient vibration measurements of superstructures. The Hangzhou Bay Bridge, a cable-stayed bridge with high scour potential, was selected to illustrate the application of this method. Firstly, two ambient vibration measurements were conducted in 2013 and 2016 by installing the acceleration sensors on the girders and pylon. By modal analysis, the natural frequencies of the superstructures were calculated with respect to different mode shapes. Then, by tracing the change of dynamic features between two measurements in 2013 and 2016, the discrepancies of the support boundary conditions, i.e., at the foundation of the Hangzhou Bay Bridge, were detected, which, in turn, qualitatively identified the existence of bridge foundation scour. Secondly, an FE model of the bridge considering soil-pile interaction was established to further quantify the scour depth in two steps. (1) The stiffness of the soil springs representing the support boundary of the bridge was initially identified by the model updating method. In this step, the principle for a successful identification is to make the simulation results best fit the measured natural frequencies of those modes insensitive to the scour. (2) Then, using the updated FE model, the scour depth was identified by updating the depth of supporting soils. In this step, the principle of model updating is to make the simulation results best fit the measured natural frequency changes of those modes sensitive to the scour. Finally, a comparison to the underwater terrain map of the Hangzhou Bay Bridge was carried out to verify the accuracy of the predicted scour depth. Based on the study in this paper, it shows that the proposed method for identifying bridge scour based on the ambient vibration measurements of superstructures is effective and convenient. It is feasible to quickly assess scour conditions for a large number of bridges without underwater devices and operations.

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“…Therefore, a more-refine element was meshed around the pile and riverbed for making a better observation of the scour development. In the simulation, the mesh size was set 0.5 cm for the refined places and 1 cm elsewhere [14]. Two mesh planes (x and y directions) were set around the pier to increase the model accuracy and two blocks were built at the inlet and outlet of the channel to prevent upward movement of sediments at the upstream.…”

Section: Experiments Setupmentioning

confidence: 99%

Assessment of Turbulence Models on Bridge-Pier Scour Using Flow-3D

Man¹,

Zhang²,

Hong³

et al. 2019

WJET

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The main purpose of this paper is to analyze the influence of different turbulence flow models on scouring pit of bridge-pier. Flow-3D software is applied in line with the purpose. The key motivation for this study is to contribute to the Flow-3D software by means of some modification and adjustment in the sediment scour model and shallow water model. An assessment of turbulence model adopted with the parameters of the Melville experiment to estimate the maximum scour-depth was performed. In the simulation results, the alternate eddy formation and shedding were repeated while the Karman vortex street formed behind the pier for the large eddy simulation LES turbulence model is more realistic in the flow phenomenon. The results of the scour development of large eddy simulation (LES) turbulence model were found to be more satisfied than the Renormalized group (RNG) turbulence model and close to the prior experiment results. The simulated scour results were significantly different with the observed data collected from previous literature in the reason of some unsuitability of meshing method in Flow-3D software.

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CFD Simulations and Analyses for Bridge-Scour Development Using a Dynamic-Mesh Updating Technique

Cited by 51 publications

References 23 publications

Numerical simulations of lateral restraining stiffness effect on bridge deck–wave interaction under solitary waves

Numerical simulations of lateral restraining stiffness effect on bridge deck–wave interaction under solitary waves

Bridge Scour Identification and Field Application Based on Ambient Vibration Measurements of Superstructures

Assessment of Turbulence Models on Bridge-Pier Scour Using Flow-3D

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