Modeling of Wave-Induced Sediment Transport Around Obstacles

Grilli, Stéphan T.; Harris, Jeffrey C.; Greene, Nathanael

doi:10.1142/9789814277426_0136

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…This 3D-NWT was initially based on combining a 3 rd -order BEM, based on a free-space Green's function in the physical space, with an explicit time updating based on 2 nd -order Taylor series expansions, in a Mixed Eulerian-Lagrangian (MEL) formulation [19][20][21]. To improve the computational efficiency, the method was later extended [4,[21][22][23][24]] to using a Fast Multipole Algorithm (FMA). The method used for solving the BEM algebraic system was Generalized Minimal Residual (GMRES).…”

Section: Background Of Fnpf Theory Andmentioning

confidence: 99%

“…Grilli, et al [24] extended this 2D wavemaker generation to arbitrary irregular waves, based on a target wave energy spectrum (such as a JONSWAP spectrum), and the possibility to correct the wavemaker stroke function for reflection in the NWT. In the 3D-NWT, Brandini and Grilli [19] implemented a snake flap wavemaker to model 3D wave focusing (see also, [21]).…”

Section: Piston Wavemaker Motion and Wave Generationmentioning

confidence: 99%

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An Efficient 3-D FNPF Numerical Wave Tank for Virtual Large-Scale Wave Basin Experiment

Nimmala

Yim

Grilli

2012

Volume 4: Offshore Geotechnics; Ronald W. Yeung Honoring Symposium on Offshore and Ship Hydrodynamics

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This paper presents an accurate and efficient threedimensional computational model (3D numerical wave tank), based on fully nonlinear potential flow (FNPF) theory, and its extension to incorporate the motion of a laboratory snake piston wavemaker, to simulate experiments in a large-scale 3D wave basin (i.e. to conduct "virtual" or numerical experiments). The code is based on a higher-order boundary element method combined with a Fast Multipole Algorithm (FMA). Particular efforts were devoted to make the code efficient for large-scale simulations using high-performance computing platforms to complement experimental 3D wave basins. The numerical simulation capability can serve as an optimization tool at the experimental planning and detailed design stages. To date, waves that can be generated in the NWT include solitary, Cnoidal, and Airy waves. In this paper, we detail the model, mathematical formulation, and wave generation. Experimental or analytical comparisons with NWT results are provided for several cases to assess the accuracy and applicability of the numerical model to practical engineering problems. INTRODUCTIONOver the past decade, as modern computing platforms gradually increased in power, accurate and efficient threedimensional (3D) computational wave-basins (called numerical wave tanks or simply NWTs in this paper) have been developed and refined, which simulate complex processes of ocean wave generation, propagation over arbitrary bottom topography, interaction with ocean structures, and dissipation over sloping beaches. These computational tools allow researchers to conduct "virtual" or numerical experiments. Until recently, fluid dynamic phenomena had been mostly investigated by performing laboratory experiments in large-scale 3D wave basins, which are both expensive and time consuming to operate. While not intended

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Section: Background Of Fnpf Theory Andmentioning

confidence: 99%

Section: Piston Wavemaker Motion and Wave Generationmentioning

confidence: 99%

An Efficient 3-D FNPF Numerical Wave Tank for Virtual Large-Scale Wave Basin Experiment

Nimmala

Yim

Grilli

2012

Volume 4: Offshore Geotechnics; Ronald W. Yeung Honoring Symposium on Offshore and Ship Hydrodynamics

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“…Here we simulate wave-induced flows over vortex ripples using a previously developed and validated hybrid hydrodynamic model in which a "near-field" Large Eddy Simulation (LES) model, solving Navier-Stokes (NS) equations, is forced by a "far-field" model, solving inviscid Euler equations (Grilli et al, 2009;Harris and Grilli, 2012). Additionally, in the present work, wave-induced sediment suspension and transport, forced by the computed flow, are simulated with a model combining a semi-empirical reference concentration along the seabed and a standard equation simulating sediment transport and accretion.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of sediment transport over rippled beds

Harris

Grilli

2014

Nonlin. Processes Geophys.

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Abstract. Wave-induced boundary layer (BL) flows over sandy rippled bottoms are studied using a numerical model that applies a one-way coupling of a "far-field" inviscid flow model to a "near-field" large eddy simulation (LES) NavierStokes (NS) model. The incident inviscid velocity and pressure fields force the LES, in which near-field, wave-induced, turbulent bottom BL flows are simulated. A sediment suspension and transport model is embedded within the coupled flow model. The numerical implementation of the various models has been reported elsewhere, where we showed that the LES was able to accurately simulate both mean flow and turbulent statistics for oscillatory BL flows over a flat, rough bed. Here we show that the model accurately predicts the mean velocity fields and suspended sediment concentration for oscillatory flows over full-scale vortex ripples. Tests show that surface roughness has a significant effect on the results. Beyond increasing our insight into wave-induced oscillatory bottom BL physics, sophisticated coupled models of sediment transport such as that presented have the potential to make quantitative predictions of sediment transport and erosion/accretion around partly buried objects in the bottom, which is important for a vast array of bottom deployed instrumentation and other practical ocean engineering problems.

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“…Most papers referred to various mathematical models of wave-wave interaction in shallow water, wave run-up on sloping beaches, conical obstacles or vertical cylinders, respectively [16][17][18][19][20][21][22][23][24][25]. Some of these papers compare experimental setup results with results obtained from numerical simulation for validation purposes.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of tsunamis generated by asteroid impact in the Black Sea

Isvoranu

Badescu

2012

Open Physics

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Abstract:Two-dimensional and one-dimensional models are used to evaluate the seashore effects of the tsunami generated by an asteroid hitting the deep water in the Eastern region of the Black Sea. The shallow water theory has been used to describe tsunami propagation. The distance between the impact point and the nearest coast is about 150 km. The effects on the coastal regions depend on many factors among which the most important is asteroid size. The tsunami generated by a 250 m asteroid reaches the nearest dry land location in 20 minutes and needs about two hours to hit all over the Black Sea coast. The horizontal inundation length is also known as run-in or run-off distance, according to the direction of water movement.The run-up values may be up to 39 m in the Eastern basin and a more than ten times smaller in the Western region. The Northern part of the Black Sea coast is not affected by the tsunami. The run-in values of a tsunami generated by a 1000 m diameter asteroid are sensibly larger than the similar values associated to a 250 m diameter asteroid. The run-in strongly depends on the distance from the impact position to the shore and on coastal topographical profile. For instance, the run-in distance in case of a tsunami generated by a 250 m size asteroid is 0.1 km (at Varna), 0.5 km (Ordu), 0.7 km (Yalta) and 1.4 km (Sochi). In case of the 1000 m diameter asteroid the run-in distance is 0.7 km (at Varna) and 2.9 km (Yalta). The results accuracy is also discussed. PACS

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Modeling of Wave-Induced Sediment Transport Around Obstacles

Cited by 8 publications

References 14 publications

An Efficient 3-D FNPF Numerical Wave Tank for Virtual Large-Scale Wave Basin Experiment

An Efficient 3-D FNPF Numerical Wave Tank for Virtual Large-Scale Wave Basin Experiment

Large eddy simulation of sediment transport over rippled beds

Hydrodynamics of tsunamis generated by asteroid impact in the Black Sea

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