Numerical Modeling of Wave Interaction with Porous Structures

Liu, Philip L.‐F.; Lin, Pengzhi; Chang, Kuang‐An; Sakakiyama, Tsutomu

doi:10.1061/(asce)0733-950x(1999)125:6(322)

Cited by 363 publications

(231 citation statements)

References 18 publications

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“…They appear after applying a modified Forchheimer closure model for unsteady conditions [Liu et al, 1999] in order to solve the inter facial momentum transfer terms. Both coefficients need to be determined numerically as they rely heavily on the flow and porous media characteristics to be modeled (see section 3.2).…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…The volume of fluid (VOF) method of Hirt and Nichols [1981] is used to track the free surface and the finite difference two-step projection method [Chorin, 1969] is adopted to solve the governing equations. Lin and Liu [1998a,b] provide a full description of the COBRAS model and additional works by Liu et al [1999] and Hsu et al [2002] elaborate on the implementation of the porous media and related physics. Hence, interested readers are referred to the aforementioned studies for detailed information.…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…The second calibration step of the model in the presence of the permeable bed requires the determination of a and b coefficients in equation (2). Some guidance in the prospective values of a and b exists in the literature [e.g., Liu et al, 1999;Hsu et al, 2002;Lara et al, 2006aLara et al, , 2008. However, most of the previous studies were focused on wave-structure interactions with porous elements in the range of 0.01-0.5 m. Therefore, here the selection of appropriate values is based on the model skill as defined by equation (7).…”

Section: Numerical Implementation and Model Calibrationmentioning

confidence: 99%

See 2 more Smart Citations

On the role of infiltration and exfiltration in swash zone boundary layer dynamics

et al. 2015

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Boundary layer dynamics are investigated using a 2‐D numerical model that solves the Volume‐Averaged Reynolds‐Averaged Navier‐Stokes equations, with a VOF‐tracking scheme and a k ‐ ϵ turbulence closure. The model is validated with highly resolved data of dam break driven swash flows over gravel impermeable and permeable beds. The spatial gradients of the velocity, bed shear stress, and turbulence intensity terms are investigated with reference to bottom boundary layer (BL) dynamics. Numerical results show that the mean vorticity responds to flow divergence/convergence at the surface that result from accelerating/decelerating portions of the flow, bed shear stress, and sinking/injection of turbulence due to infiltration/exfiltration. Hence, the zero up‐crossing of the vorticity is employed as a proxy of the BL thickness inside the shallow swash zone flows. During the uprush phase, the BL develops almost instantaneously with bore arrival and fluctuates below the surface due to flow instabilities and related horizontal straining. In contrast, during the backwash phase, the BL grows quasi‐linearly with less influence of surface‐induced forces. However, the infiltration produces a reduction of the maximum excursion and duration of the swash event. These effects have important implications for the BL development. The numerical results suggest that the BL growth rate deviates rapidly from a quasi‐linear trend if the infiltration is dominant during the initial backwash phase and the flat plate boundary layer theory may no longer be applicable under these conditions.

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Section: Mathematical Formulationmentioning

confidence: 99%

Section: Mathematical Formulationmentioning

confidence: 99%

Section: Numerical Implementation and Model Calibrationmentioning

confidence: 99%

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On the role of infiltration and exfiltration in swash zone boundary layer dynamics

et al. 2015

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“…In recent years, more general and rigorous models have been developed based on van Gent's (1995) Reynolds-averaged Navier-Stokes (RANS) equations, also including those by Huang et al (2003) and Liu et al (1999). Huang et al (2003) coupled the unsteady laminar NS equation model and another NS-type model to separately solve the flows outside and inside the porous structure for a solitary wave interaction with submerged porous breakwater.…”

Section: Introductionmentioning

confidence: 99%

Incompressible SPH simulation of wave interaction with porous structure

et al. 2015

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In this paper an incompressible Smoothed Particle Hydrodynamics (ISPH) method is applied to investigate the flow motion in and around the porous structure. In order to describe in a simple and effective way the flow through the interface between the porous region and pure fluid region within the SPH framework, a heuristic boundary treatment method has been proposed. The ISPH model is first verified against a theoretical model of wave propagation over a porous bed and then further validated by comparing the predicted wave surface profiles and flow velocity fields with the experiment data for a typical case of flow motion around and inside a submerged porous structure. The good agreement has demonstrated that the improved ISPH model developed in this work is capable of modelling wave interaction with porous structures.

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“…A number of studies have been carried out on numerical simulation of flow through and around such structures, e.g. Jensen et al (2014), Hsu et al (2002), Liu et al (1999), Losada et al (2008), del Jesus et al (2012, Higuera et al (2014a) and Higuera et al (2014b). Among these works, the effect of porous structures on the fluid was taken into account without resolving the exact geometry of them.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the porous resistance coefficients for fishing net structures

Chen

Christensen

2016

Journal of Fluids and Structures

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The porous media model has been successfully applied to numerical simulation of current and wave interaction with traditional permeable coastal structures such as breakwaters. Recently this model was employed to simulate flow through and around fishing net structures, where the unknown porous resistance coefficients were adjusted by fitting the available experimental data. In the present paper, a new approach was proposed to calculate the porous resistance coefficients based on the transformation of Morison type load model. The transformation follows the principle that the total forces acting on a net panel from Morison type load model should be equal to the forces obtained from the porous media model. In order to account for the interaction effects in-between the twines, two coefficients were introduced, and they were calibrated by minimizing the least square error function. Extensive validation cases were carried out to examine the performance of the numerical model. This includes steady current flow through plane net panels and circular fish cages, and wave interaction with plane net panels. A variety of fishing nets with different solidity ratios were used in the validation cases, from which it was seen that the overall agreement between the numerical and experimental results is fair.

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Numerical Modeling of Wave Interaction with Porous Structures

Cited by 363 publications

References 18 publications

On the role of infiltration and exfiltration in swash zone boundary layer dynamics

On the role of infiltration and exfiltration in swash zone boundary layer dynamics

Incompressible SPH simulation of wave interaction with porous structure

Investigations on the porous resistance coefficients for fishing net structures

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