A combined level set/ghost cell immersed boundary representation for floating body simulations

Bihs, Hans; Kamath, Arun

doi:10.1002/fld.4333

Cited by 55 publications

(50 citation statements)

References 36 publications

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“…Expanding the computational domain towards the third dimension (i.e., along the banks) could point out the relevance of natural, three‐dimensional bathymetry on wave shoaling. The six degrees of freedom (6DOF) algorithm implemented in the employed CFD model offers the numerical simulation of fluid–solid interactions (Bihs & Kamath, ), which in present case could mean the numerical simulation of these wave events along a whole river reach. It would not only offer the hydrodynamic characterization of ship waves in much larger spatial scales but also could provide an efficient, site‐specific investigation tool to analyse the effects of various ship related (shape, draught, travelling speed, etc.)…”

Section: Discussionmentioning

confidence: 99%

A practical framework to assess the hydrodynamic impact of ship waves on river banks

Fleit

Baranya

Krámer

et al. 2019

River Research & Apps

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The temporal alteration of the hydrodynamic regime in rivers due to navigation has significant effects on riverine ecosystems. Most of the key mechanisms and interactions between hydrodynamic and ecological variables have already been revealed; however, the quantitative evaluation of biotic and abiotic variables still stands a challenge. This paper aims to present a thorough, spatiotemporal framework, involving field and computational tools, for the assessment of wave hydrodynamics in the littoral zone of rivers, where its ecological relevance is the most significant. The temporal variation of significant wave heights is derived from high-frequency pressure measurements, offering a well-comparable statistical evaluation of individual wave events considering the duration of different wave intensities. Acoustic Doppler velocimetry (ADV) is used for the assessment of near-bank velocities, from which the secondary wave-related components have been filtered offering relevant validation data for numerical modelling. The small footprint of the ADVs is extended with up-to-date computational fluid dynamics modelling. Wave spectra derived from the pressure measurements are used as boundary conditions for phase-resolved irregular wave modelling with the level set method based numerical model REEF3D. The properly validated model offers the assessment of the most relevant hydrodynamic variables (e.g., velocity or turbulent kinetic energy) in a spatially extended manner, from which the hydrodynamic footprint of the wave events can be interpreted in a statistical fashion. The implementation of the proposed framework is illustrated through a case study at a Hungarian section of the Danube River.

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Section: Discussionmentioning

confidence: 99%

A practical framework to assess the hydrodynamic impact of ship waves on river banks

Fleit

Baranya

Krámer

et al. 2019

River Research & Apps

View full text Add to dashboard Cite

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“…Some of the CFD-based NWTs in the current literature are those presented by Yang and Stern [1], Jacobsen et al [2] in OpenFOAM, Higuera et al [3] in OpenFOAM and REEF3D presented by Bihs et al [4]. These NWTs have been used to simulate different phenomena such as spilling breaking waves [5,6], plunging breaking waves [7], breaking wave forces [8][9][10], wave loads [11][12][13], wave interaction with permeable coastal structures [14,15] and wave interaction with floating bodies [16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Different Methods for Wave Generation and Absorption in a CFD-Based Numerical Wave Tank

Miquel

Kamath

Chella

et al. 2018

JMSE

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In this paper, the performance of different wave generation and absorption methods in computational fluid dynamics (CFD)-based numerical wave tanks (NWTs) is analyzed. The open-source CFD code REEF3D is used, which solves the Reynolds-averaged Navier-Stokes (RANS) equations to simulate two-phase flow problems. The water surface is computed with the level set method (LSM), and turbulence is modeled with the k-ω model. The NWT includes different methods to generate and absorb waves: the relaxation method, the Dirichlet-type method and active wave absorption. A sensitivity analysis has been conducted in order to quantify and compare the differences in terms of absorption quality between these methods. A reflection analysis based on an arbitrary number of wave gauges has been adopted to conduct the study. Tests include reflection analysis of linear, second-and fifth-order Stokes waves, solitary waves, cnoidal waves and irregular waves generated in an NWT. Wave breaking over a sloping bed and wave forces on a vertical cylinder are calculated, and the influence of the reflections on the wave breaking location and the wave forces on the cylinder is investigated. In addition, a comparison with another open-source CFD code, OpenFOAM, has been carried out based on published results. Some differences in the calculated quantities depending on the wave generation and absorption method have been observed. The active wave absorption method is seen to be more efficient for long waves, whereas the relaxation method performs better for shorter waves. The relaxation method-based numerical beach generally results in lower reflected waves in the wave tank for most of the cases simulated in this study. The comparably better performance of the relaxation method comes at the cost of larger computational requirements due to the relaxation zones that have to be included in the domain. The reflections in the NWT in REEF3D are generally lower than the published results for reflections using the active wave absorption method in the NWT based on OpenFOAM.

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“…The detailed information about the numerical model can be obtained in [11]. REEF3D has been used in the past for a wide range of marine applications, such as breaking wave forces [18,19], floating body dynamics [20], irregular wave analysis [21] and sediment transport [22].…”

Section: Reef3dmentioning

confidence: 99%

Computational Fluid Dynamics Investigations of Breaking Focused Wave-Induced Loads on a Monopile and the Effect of Breaker Location

Aggarwal

Tomaselli

Christensen

et al. 2019

Journal of Offshore Mechanics and Arctic Engineering

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The design of new offshore structures requires the calculation of the wave-induced loads. In this regard, the computational fluid dynamics (CFD) methodology has shown to be a reliable tool, in the case of breaking waves especially. In this paper, two CFD models are tested in the reproduction of the experimental spilling waves impacting a circular cylinder for four different wave impact scenarios for focused waves. The numerical and experimental free surface elevations at different locations around the cylinder are also compared to verify the both numerical models. The numerical results from the models are shown together with the experimental measurements. Both CFD models are able to model the impact forces with a reasonable accuracy. When the cylinder is placed at a distance of 0.7 m from the wave breaking point, the value of the measured wave impact forces is highest due to the overturning wave crest and air entrainment. The wave-induced impact forces decrease, when the monopile is placed at distances further away from the breaking location.

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A combined level set/ghost cell immersed boundary representation for floating body simulations

Cited by 55 publications

References 36 publications

A practical framework to assess the hydrodynamic impact of ship waves on river banks

A practical framework to assess the hydrodynamic impact of ship waves on river banks

Analysis of Different Methods for Wave Generation and Absorption in a CFD-Based Numerical Wave Tank

Computational Fluid Dynamics Investigations of Breaking Focused Wave-Induced Loads on a Monopile and the Effect of Breaker Location

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