Numerical simulation of wave damping over porous seabeds

Karunarathna, S. A. S. A.; Lin, Pengzhi

doi:10.1016/j.coastaleng.2006.05.003

Cited by 41 publications

(26 citation statements)

References 18 publications

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“…The water depth d was 0.15 m. The porous bed was constructed by stones with mean diameter of 3.07 cm and the seabed thickness was 0.15 m. Figure 3 shows the comparison of the present numerical results with experimental and other numerical results. The other numerical results come from Cheng et al [7], and Karunarathna and Lin [16]. The figure shows a good agreement between the numerical results and experimental data, which indicates that the proposed numerical model can accurately simulate the wave interaction with porous seabed.…”

Section: Model Validationsupporting

confidence: 61%

A dynamic coupling numerical model for pollutant transport under wave condition

Lin

Zhen

2015

Acta Mech Sin

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In order to study the diffusion, migration, and distribution of pollutants among overlying water-body and porous seabed under wave conditions, a dynamic coupling numerical model is proposed. In this model, the coupling between wave field of overlying water-body and seepage of porous bed, the capture and release of pollutants in porous media, and the transport process between the two different regions are taken into account. We use the unified equations for pressure correction and pollutant concentration to solve the numerical model, which avoids repeated iteration on the interface boundary. The model is verified by several case studies. Afterwards, the processes involving release of pollutant from porous seabed and transportation to overlying water-body under different wave conditions are investigated. The results show that the water depth, wave height, and wave period have great influences on the release, capture, and transport processes for phosphorus pollutant.

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Section: Model Validationsupporting

confidence: 61%

A dynamic coupling numerical model for pollutant transport under wave condition

Lin

Zhen

2015

Acta Mech Sin

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“…(4) represent the effect of fixed porous solid skeleton, with the linear term representing the low Reynolds number flow and nonlinear term representing the high Reynolds number flow, respectively, by following Huang et al (2003;. Karunarathna and Lin (2006) had also derived various nonlinear frictional forces for the high Reynolds number flows. According to Huang et al (2003;, if the porosity w n and stone size d of the porous materials are known, the intrinsic permeability P K can be determined by the following empirical formula as   1 57 3 7 50 0 2 0 1 643 10 0 01m 1…”

Section: Equations For Flow Inside Porous Mediamentioning

confidence: 99%

“…To solve the governing equations, they employed the resistance force formulas proposed by van Gent (1995) and calibrated the linear coefficient against simple physical experiments, while keeping the inertial and original nonlinear frictional coefficients unchanged. Similarly Hsu et al (2002) used the Volume-Averaged RANS (VARANS) equations to describe the flow motion around the porous structure, and Karunarathna and Lin (2006) applied their VARANS model to study wave damping over a porous seabed. Garcia et al (2004) and Lara et al (2006) used the numerical model of Liu et al (1999) to investigate wave interactions with a low-crested permeable breakwater and validated their models with the laboratory measurements.…”

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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“…The phenomenon is called wave damping or energy dissipation (Karunarathna and Lin, 2006). The penetration of seabed induced the energy loss is the dominant component.…”

Section: Introductionmentioning

confidence: 99%

“…For flow through a porous and coarse sediment, the quadratic term with flow velocity and the time-dependent term are added in the original Darcy's low. It is widely applied to simulate the porous flow in the arbitrary flow regions and the wave dissipation in the wave-porous structures interaction with high permeability (Gu and Wang, 1991;Van Gent, 1995;Karunarathna and Lin, 2006).…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation of Wave-Uniform Current Over a Rigid Porous Media With Finite Thickness

Lin

Hsu

Yu³

et al. 2014

Int. Conf. Coastal. Eng.

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The linear wave theory and the nonlinear-unsteady porous flow model are applied to analyze the energy dissipation and the bed pore water pressure induced by the interaction of wave, uniform current and porous bottom without considering the nonlinear waves and the viscosity effect inside the boundary layer. In this model, the linear, inertial and turbulent resistances are combined into a linearized resistance coefficient and the present system can be analyzed by a linear boundary value problem. The numerical result is quite agreement with the existing experimental data. It shows that the energy dissipation is reduced by the Doppler shift and the distribution of energy loss moves to the lower relative water depth region in the wave-following current. On the other hand, the bed pore water pressure in the wave-following current is always lager than that in the pure wave and the wave-opposing current.Keywords：wave-current interaction, rigid porous medium, nonlinear-unsteady porous flow model, energy dissipation 1.IntroductionThe Doppler shift is the relative motion which is the change in the frequency of waves for an observer moving relative to the source. In the water wave, it represents the wave-current interaction. Non-uniform or uniform currents influence the characteristics of waves. The speed and wavelength are increased in waves encountering a favorable current and vice verse for the opposing current (Nielsen, 2012).A lot of theoretical and experimental studies for wave-varying current interaction in the infinite and finite water depth with the smooth impermeable seabed had been performed. Typical samples are found in Stewart(1960,1961), Jonsson et al.(1970Jonsson et al.( ,1978, Jonsson(1977), Peregrine(1976), Thomas(1981Thomas( ,1990, Baddourand Song (1990), Groeneweg and Battjes (2003) (2013, 2014) used the perturbation approach to analyze the high-order nonlinear wave-current interaction in 3D Lagrangian scheme, and the mass transport velocity and the particle orbit both were measured in the 1D wave-current tank. In the laboratory experiment (Huang et al.,1972), it displayed the relative importance of wave-current interaction is decided by the nondimensional parameter 0 / U C with U as the current velocity and 0 C the wave speed without the current. The kinematics of the strong interaction in the wave-current motion were measured by Lai et al.(1989). Their results confirmed the critical 0 / U C with the currents induced the blockage of waves is -0.25. Soares and Pablo (2006) carried out an experimental study for the wave-current motion, and determined the change of wave spectra due to the coexistence of wave-current in the 3D wave basin. The experimental results showed that the energy absorbed by waves in the opposing current is impossible to continue the growth, and it is up to a certain limit, eventually resulting in wave breaking. However, the porous seabed and the energy dissipation are not considered in there existing studies.The experiment for the wave-current interaction over a rough bed was perfo...

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Numerical simulation of wave damping over porous seabeds

Cited by 41 publications

References 18 publications

A dynamic coupling numerical model for pollutant transport under wave condition

A dynamic coupling numerical model for pollutant transport under wave condition

Incompressible SPH simulation of wave interaction with porous structure

Energy Dissipation of Wave-Uniform Current Over a Rigid Porous Media With Finite Thickness

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