Interface-Capturing Method for Free-Surface Plunging and Breaking Waves

Zhu, Lixing; Goraya, Shoaib A.; Masud, Arif

doi:10.1061/(asce)em.1943-7889.0001641

Cited by 19 publications

(5 citation statements)

References 33 publications

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“…Investigations on other types of FOWT motion are underway, which will be presented in future work. These interactions between the wind, the FOWT and the waves, which can be solved using fully coupled two-phase CFD solvers (Li et al 2019;Zhu, Goraya & Masud 2019;Gatin et al 2020;Zhu & Masud 2021), are not considered, and will also be studied in a systematic way in future work. actuator surface model .…”

Section: Discussionmentioning

confidence: 99%

Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

Dong

Yang

2022

J. Fluid Mech.

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Wind turbine wakes, being convectively unstable, may behave as an amplifier of upstream perturbations and make downstream turbines experience strong inflow fluctuations. In this work, we investigate the effects of the side-to-side motion of a floating offshore wind turbine (FOWT) on wake dynamics using large-eddy simulation and linear stability analysis (LSA). When the inflow turbulence intensity is low, simulation results reveal that the turbine motion with certain Strouhal numbers $St = fD/U_\infty \in (0.2,0.6)$ (where $f$ is the motion frequency, $D$ is the rotor diameter, and $U_\infty$ is the incoming wind speed), which overlap with the Strouhal numbers of wake meandering induced by the shear layer instability, can lead to wake meandering with amplitudes being one order of magnitude larger than the FOWT motion for the most unstable frequency. For high inflow turbulence intensity, on the other hand, the onset of wake meandering is dominated by the inflow turbulence. The probability density function of the spanwise instantaneous wake centres is observed being non-Gaussian and closely related to that of the side-to-side motion. This complements the existing wake meandering mechanisms, that the side-to-side motion of an FOWT can be a novel origin for the onset of wake meandering. It is also found that LSA can predict the least stable frequencies and the amplification factor with acceptable accuracy for motion amplitude $0.01D$ . Effects of nonlinearity are observed when motion amplitude increases to $0.04D$ , for which the most unstable turbine oscillations shift slightly to lower frequencies and the amplification factor decreases.

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Section: Discussionmentioning

confidence: 99%

Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

Dong

Yang

2022

J. Fluid Mech.

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“…Interface-capturing method has advantages for problems with large interface deformation, because it can automatically deal with topological changes. Interface-capturing method has been applied to challenging engineering problems in marine engineering, 16,17 jet atomization 18 and bubble dynamics. [19][20][21] In this paper, we utilize the level set interface-capturing method based on a large-scale finite element framework for modeling free-surface flows.…”

Section: Introductionmentioning

confidence: 99%

A finite element level set method based on adaptive octree meshes for thermal free‐surface flows

Zhu

Fernando

et al. 2022

Numerical Meth Engineering

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We develop a parallel finite element computational framework based on the level set method and adaptive octree meshes for free‐surface flows. The discretized governing formulations are stabilized using a residual‐based variational multiscale method. We redistance the level set field and restore mass conservation after each time step. The octree mesh is adaptively refined according to the interface location, and the load is rebalanced across processes. The adaptive octree‐based level set method is verified and validated using a canonical problem of dam break without obstacle, and a mesh convergence study is carried out in this problem. The surface tension is further considered via a continuum surface force model in the method and validated using a problem of single bubble rising in ambient liquid. A parallel scaling analysis of this method is also performed for the bubble rising problem. The energy equation and Marangoni effect are finally considered in the method and validated using a problem of thermocapillary droplet migration with and without gravity. This work illustrates the ability of the framework to accurately model and predict free‐surface flows under various scenarios.

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“…On the basis of this approach, new models for many more complicated problems were also further proposed, e.g. the models for premixed combustion problem [22], multiphase flows with surface tension [23][24][25], fluid-structure interaction in the free-surface flows [26][27][28][29][30][31] and stratified turbulent flows [32].…”

Section: Introductionmentioning

confidence: 99%

Turbulent kinetic dissipation analysis for residual-based large eddy simulation of incompressible turbulent flow by variational multiscale method

Chen

Hulshoff

Dong

2022

Computer Methods in Applied Mechanics and Engineering

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Interface-Capturing Method for Free-Surface Plunging and Breaking Waves

Cited by 19 publications

References 33 publications

Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

Onset of wake meandering for a floating offshore wind turbine under side-to-side motion

A finite element level set method based on adaptive octree meshes for thermal free‐surface flows

Turbulent kinetic dissipation analysis for residual-based large eddy simulation of incompressible turbulent flow by variational multiscale method

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