Scour modeling based on immersed boundary method: A pathway to practical use of three-dimensional scour models

Song, Yalan; Xu, Yuncheng; Ismail, Hassan; Liu, Xiaofeng

doi:10.1016/j.coastaleng.2021.104037

Cited by 17 publications

(7 citation statements)

References 37 publications

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“…When the pile was submerged in a relatively shallow flow depth, i.e., 1 ≤ h/h c ≤ 1.5, the K hh c factor, as shown in Equation ( 6), increased linearly with h/h c . Therefore, the submergence ratio effects on the equilibrium scour depth was obtained for Equation (5), which was based on the equation proposed by Melville [1].…”

Section: Temporal and Equilibrium Scour Depthsmentioning

confidence: 99%

“…In coastal and offshore engineering, local scour induced by currents threatens the stability of structures. Numerous researchers have focused on the local scour of unsubmerged circular piles [1][2][3][4][5], but studies on submerged square piles are few. The submerged vertical square piles represent a range of sub-sea structures, such as caissons, manifolds and pipeline foundations in oil and gas explorations [6].…”

Section: Introductionmentioning

confidence: 99%

“…The strong, nonlinearly complex interactions of fluid, pile and sediments induced by the flow turbulence of the horseshoe vortex, flow accelerations and wake vortices around the pile are the mechanisms of local scour [9]. In addition to the experimental methods in studying the mechanisms and characteristics of local scour that were conducted by [1][2][3][4][5][6][7][8][9], recently, Baykal et al [10] studied the bed shear stress induced by these three phenomena in waves and currents numerically. Specifically, they found that in accordance with the current conditions alone, the horseshoe vortex underwent substantial changes in waves depending on the Keulegan-Carpenter number.…”

Section: Introductionmentioning

confidence: 99%

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Scour at a Submerged Square Pile in Various Flow Depths under Steady Flow

Wu²,

Liang³

et al. 2022

Water

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Local scour around submerged piles in currents are common in coastal and offshore engineering. This paper studies the influences of the submergence ratio (flow depth to pile height) on local scour around a square pile in steady flow. Submergence ratio ranging from 1–4, as well as two unsubmerged tests, were tested with a 10 × 10 square pile of 20 cm height. The three-dimensional profiles were measured to study the scour and deposition characteristics. Results show that the maximum scour depth was always at the upstream corner points rather than at the symmetry center point of the pile. The temporal maximum scour depth achieved its equilibrium sate in less than 4 h for each test. The equilibrium scour depths at the upstream corner points were independent of the submergence ratio when the latter was larger than 1.5. These findings give meaningful reference to the numerical simulations and local scour depth protections in the submerged pile cases deeper than which the flow depth does not affect the equilibrium scour depth.

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Section: Temporal and Equilibrium Scour Depthsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scour at a Submerged Square Pile in Various Flow Depths under Steady Flow

Wu²,

Liang³

et al. 2022

Water

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“…Jalal and Hassan [62] examined various types and sizes of cells to identify optimum cell (5-10 mm) that balances the accuracy of results and reduction in computation time. Song et al [63] developed a 3D scour model, ibScourFoam, based on an immersed boundary method, validated against available data from the literature and their own flume experiment. Their model showed advantage over previous scour models in accurate simulation of the scour process around complex structures.…”

Section: Field and Experimental Datamentioning

confidence: 99%

Scour at Bridge Piers Protected by the Riprap Sloping Structure: A Review

Harasti

Gilja

Potočki

et al. 2021

Water

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Bridge piers on large rivers are often protected from scouring using launchable stone, such as a riprap sloping structure. While such scour countermeasures are effective for pier protection, they significantly alter flow conditions in the bridge opening by overtopping flow and flow contraction, deflecting the formation of the scour hole downstream and exposing the downstream riverbed to additional scour. This paper provides a comprehensive and relevant review of bridge scour estimation methods for piers with a riprap sloping structure installed as a scour countermeasure. Research on empirical methods for bridge scour estimation is reviewed and analyzed with formulae used for comparable structures—complex pier formulae and formulae for river training structures. A summary of relevant formulae applicable to piers with installed scour countermeasures is provided, as well as a discussion on the possible future research directions that could contribute to the field.

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“…Previous simulations of the flow inside a scour hole have employed Reynolds-averaged simulations (Roulund et al 2005), detached-eddy simulations (DES) and large-eddy simulations (LES) (Kirkil et al 2008) with block-structured or overset boundary-fitted curvilinear grids (Escauriaza 2008;Kirkil et al 2009) or on boundary-fitted unstructured meshes (Baykal et al 2015;Song et al 2022). In all these simulations, however, no direct comparison to experimental data -time-averaged flow fields, turbulence statistics and wall shear stress distribution -has been presented.…”

Section: Introductionmentioning

confidence: 99%

Large–Eddy Simulation of the Flow Inside a Scour Hole Around a Circular Cylinder Using a Cut Cell Immersed Boundary Method

Unglehrt

Jenssen

Kurz³

et al. 2022

Flow Turbulence Combust

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We present a novel symmetry-preserving cut cell finite volume method which is a three-dimensional generalisation of the method by Dröge and Verstappen (Int J Numer Method Fluids 47:979–985, 2005). A colour-coding scheme for the three-dimensional cut momentum cell faces reduces the number of possible cut cell configurations. A cell merging strategy is employed to alleviate time step constraints. We demonstrate the energy conservation property of the convective and pressure gradient terms, and the second-order spatial convergence with suitable benchmark cases. We used the scheme to perform highly resolved large–eddy simulations of the flow inside a scour hole around a circular cylinder mounted vertically in a flume. The simulation results are extensively compared to a stereoscopic particle image velocimetry experiment of the same configuration performed by Jenssen and Manhart (Exp Fluids 61:217, 2020). We demonstrate that for the investigated Reynolds numbers (20,000 and 40,000) nearly converged solutions are obtained; however at large computational efforts (up to 2.35 billion cells for the higher Reynolds number). It turns out that the flow topology of the horseshoe vortex system is strongly dependent on the grid resolution. For simulation results obtained on the finest grid, the mean flow and turbulence quantities agree well with the experiment. We investigate the shape and turbulence structure of the horseshoe vortex based on three-dimensional fields, and discuss the distribution of the mean and standard deviation of the wall shear stress in the scour hole and the implications for the physics of the scouring process over a sand bed.

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Scour modeling based on immersed boundary method: A pathway to practical use of three-dimensional scour models

Cited by 17 publications

References 37 publications

Scour at a Submerged Square Pile in Various Flow Depths under Steady Flow

Scour at a Submerged Square Pile in Various Flow Depths under Steady Flow

Scour at Bridge Piers Protected by the Riprap Sloping Structure: A Review

Large–Eddy Simulation of the Flow Inside a Scour Hole Around a Circular Cylinder Using a Cut Cell Immersed Boundary Method

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