3D CFD simulations of trailing suction hopper dredger plume mixing: Comparison with field measurements

Wit, Lynyrd de; Talmon, A.M.; Rhee, Cees van

doi:10.1016/j.marpolbul.2014.08.042

Cited by 16 publications

(3 citation statements)

References 40 publications

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“…Therefore, large eddy simulations can provide a wealth of insights into the structure and physical behavior of turbidity currents, in particular into the turbulence structure including turbulent kinetic energy and Reynolds stresses. The numerical model that we use has been applied earlier to gain insights into the complicated dredge plume behavior close to a dredging vessel where density differences, turbulent mixing and sediment settling play an important role [27][28][29]. The model has been validated for a wide range of flow cases relevant to the present study, such as the front speed of density currents radially spreading and density currents running over both flat and sloping beds, the deposition from high-concentration suspended sediment flow at a flat bed [30], and high sediment concentration conditions encountered in hopper sedimentation [31].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Breaching-Generated Turbidity Currents Using Large Eddy Simulation

Alhaddad

Wit

Labeur

et al. 2020

JMSE

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Breaching flow slides result in a turbidity current running over and directly interacting with the eroding, submarine slope surface, thereby promoting further sediment erosion. The investigation and understanding of this current are crucial, as it is the main parameter influencing the failure evolution and fate of sediment during the breaching phenomenon. In contrast to previous numerical studies dealing with this specific type of turbidity currents, we present a 3D numerical model that simulates the flow structure and hydrodynamics of breaching-generated turbidity currents. The turbulent behavior in the model is captured by large eddy simulation (LES). We present a set of numerical simulations that reproduce particular, previously published experimental results. Through these simulations, we show the validity, applicability, and advantage of the proposed numerical model for the investigation of the flow characteristics. The principal characteristics of the turbidity current are reproduced well, apart from the layer thickness. We also propose a breaching erosion model and validate it using the same series of experimental data. Quite good agreement is observed between the experimental data and the computed erosion rates. The numerical results confirm that breaching-generated turbidity currents are self-accelerating and indicate that they evolve in a self-similar manner.

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Section: Introductionmentioning

confidence: 99%

Modeling of Breaching-Generated Turbidity Currents Using Large Eddy Simulation

Alhaddad

Wit

Labeur

et al. 2020

JMSE

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“…Simulations are also used for designing and scaling up (industrial) processes involving erosion (De Wit, Talmon, & Van Rhee, 2014). In addition, numerical simulations have a role to play in the detailed analysis of the complex phenomena of granular bed erosion by revealing the nature and relative strength of the liquid-solid and particle-particle interactions.…”

Section: Introductionmentioning

confidence: 99%

Simulations of granular bed erosion due to a mildly turbulent shear flow

Derksen

2015

Journal of Hydraulic Research

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Three-dimensional, time-dependent simulations of the erosion of a granular bed consisting of monosized, non-cohesive spherical particles are reported. The simulations fully resolve the turbulence and the flow around each of the spheres (particle-resolved, direct simulations). The erosion is due to the turbulent flow of a Newtonian liquid in a planar channel with a Reynolds number based on wall shear velocity and channel height of 168. The main control parameter in the simulations is the Shields number that was varied between 0.03 and 0.60. The simulations were performed by means of a lattice Boltzmann scheme supplemented with an immersed boundary method to impose no-slip conditions at the particle surfaces. The results show the impact of the Shields number on the mobility of the particles at the top and above the bed. They also show a strong coupling between solids motion and the strength of the turbulent fluctuations in the liquid. Specifically, directly above the bed the particles significantly enhance turbulence at the lower end of the Shields number range investigated.

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“…For circumstances that are fundamentally different, advanced models exist to derive more appropriate values for aspects like the in-hopper settlement factor (f sett ), the overflow related passive plume fraction (s o ), etc. (cf Van Rhee, 2002;De Wit, 2010;De Wit et al, 2014a)…”

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confidence: 99%