Lattice Boltzmann modeling of water entry problems

Zarghami, Ahad; Falcucci, Giacomo; Jannelli, Elio; Succi, Sauro; Porfiri, Maurizio; Ubertini, Stefano

doi:10.1142/s0129183114410125

Cited by 37 publications

(16 citation statements)

References 33 publications

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“…Despite the capabilities of some of these analytical schemes to deal with complex geometries (Korobkin, 2006) and flexible bodies (Tassin et al, 2013;Qin and Batra, 2009), numerical models are foreseen to be preferred (Hirdaris and Temarel, 2009;Kapsenberg, 2011;Hughes et al, 2013) for their accuracy and versatility. Thus, many numerical models have been proposed for the analysis of water entry problems, ranging from traditional computational fluid dynamics (CFD) solvers (Colicchio et al, 2006;Sun and Faltinsen, 2006;Das and Batra, 2011) to meshless methods (Oger et al, 2006;Shao, 2009;Gong et al, 2009;Panciroli et al, 2012) and lattice Boltzmann solvers (De Rosis et al, 2014;Zarghami et al, 2014). The main challenges in the numerical analysis of water entry problems are associated with the impulsive nature of the impact, which may lead to large numerical oscillations (Hirsch, 2007), and the existence of a free surface, whose motion must be correctly tracked by the numerical solver.…”

Section: Introductionmentioning

confidence: 99%

Assessment of PIV-based analysis of water entry problems through synthetic numerical datasets

Facci

Ubertini

Porfiri

2015

Journal of Fluids and Structures

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a b s t r a c tThe phenomenon of hull-slamming, that is, the sudden impact of a solid body on the water surface, is critical in the design of naval structures. Thus, the development and validation of schemes to predict the slamming load and elucidate energy exchange during water entry are of fundamental importance in a wide range of engineering applications. Recent studies have demonstrated the possibility of using direct flow measurements from particle image velocimetry (PIV) to investigate the kinetics of water entry. Specifically, these efforts have contributed a first characterization of the hydrodynamic loading on impacting wedges and of the energy imparted to the water pile-up and the spray jets. Here, we seek to provide a thorough assessment of such a PIV-based approach through synthetic datasets, in which PIV parameters, such as the camera acquisition rate and the size of the interrogation area, are systematically varied, without experimental confounds. We implement a direct computational framework to study the two-dimensional flow physics generated during the water entry of a rigid wedge. Water and air are treated as immiscible phases and their relative motion is utilized to track the free surface dynamics. Our results show that the PIV-based methodology allows for an accurate reconstruction of the pressure field from the measured velocity field, except for early stages of the impact and for a small region close to the free surface. We also demonstrate that the reconstruction is only marginally affected by the spatial resolution, while a sufficiently high acquisition frequency is required to correctly predict the pressure field in the pile-up region. The proposed computational framework can also find application in the analysis of less studied aspects of water entry problems, such as cycling loading, flow transitions and separation, and formation of spray jets.

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Section: Introductionmentioning

confidence: 99%

Assessment of PIV-based analysis of water entry problems through synthetic numerical datasets

Facci

Ubertini

Porfiri

2015

Journal of Fluids and Structures

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“…The hydrodynamic forcing acting on the wetted length of the hull is schematically depicted in figure (1(a)) to highlight the presence of localized loading in the fluid pile-up region in which a high speed jet is generated. A comprehensive study regarding the simulation of wedges with a constant penetration velocity and the comparison of the numerical results with the available data and solutions in the literature has been presented in our previous work [21]. Here, we study the impact of a wedge-shaped mass on the free surface of placid water under the effect of gravity.…”

Section: Resultsmentioning

confidence: 99%

Front-tracking lattice Boltzmann simulation of a wedge water entry

Zarghami¹,

Porfiri²,

Jannelli³

et al. 2015

AIP Conference Proceedings

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In this work, we present the implementation of a front-tracking variant of the lattice Boltzmann method to model water entry problems. In this method, the fluid is considered incompressible, the gas dynamics is neglected and the free surface is represented through a layer of interface cells, whose dynamics is described using the mass and momentum fluxes across it. The consistency and accuracy of the computations is demonstrated through comparisons with theoretical solutions and experimental data reported in the literature

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“…After initialization, the FSI sub-cycle, identified in the followings by the superscript n, begins with the calculation of the interface forces. Fluid force and moment are calculated through Equations (2) and (3) and then utilized to solve the system of Equations (5)- (9). The displacement of the points on the fluid-solid interface is then estimated as:…”

Section: Coupling Algorithmmentioning

confidence: 99%

“…Fluid structure interaction (FSI) studies the physical phenomena related to the motion of a solid body, possibly compliant, within an encompassing fluid [1]. The development of reliable models for FSI is relevant for several engineering fields [2,3], including naval or marine engineering [4][5][6][7][8][9][10][11][12], bio-engineering [13][14][15][16][17], fluid machinery [1,18], energy harvesting [16,[19][20][21][22][23], environmental engineering [24,25] and micro-mechanical systems and sensing devices [26][27][28][29] and a large scientific literature deals with the numerical evaluation of the fluid forces caused by the prescribed motion of a solid structure [9,10,[19][20][21][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the development of reliable numerical methods and experimental techniques to characterize such impulsive loading is crucial for the design of several kind of engineering devices, such as marine vessels and hydraulic structures. Several works are available in literature dealing with the simulation of fluid-structure interaction in the presence of a free surface [6,9,[35][36][37]. Different numerical models, alternative to Navier-Stokes, may be also employed to simulate the fluid flow with a free surface, such as Smoothed Particles Hydrodynamics (SPH) [54,55], Lattice Boltzmann Method (LBM) [8,56] and constrained interpolation profile (CIP) method [57,58].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluid Structure Interaction of Buoyant Bodies with Free Surface Flows: Computational Modelling and Experimental Validation

Facci

Falcucci

Agresta

et al. 2019

Water

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In this paper we present a computational model for the fluid structure interaction of a buoyant rigid body immersed in a free surface flow. The presence of a free surface and its interaction with buoyant bodies make the problem very challenging. In fact, with light (compared to the fluid) or very flexible structures, fluid forces generate large displacements or accelerations of the solid and this enhances the artificial added mass effect. Such a problem is relevant in particular in naval and ocean engineering and for wave energy harvesting, where a correct prediction of the hydrodynamic loading exerted by the fluid on buoyant structures is crucial. To this aim, we develop and validate a tightly coupled algorithm that is able to deal with large structural displacement and impulsive acceleration typical, for instance, of water entry problems. The free surface flow is modeled through the volume of fluid model, the finite volume method is utilized is to discretize the flow and solid motion is described by the Newton-Euler equations. Fluid structure interaction is modeled through a Dirichlet-Newmann partitioned approach and tight coupling is achieved by utilizing a fixed-point iterative procedure. As most experimental data available in literature are limited to the first instants after the water impact, for larger hydrodynamic forces, we specifically designed a set of dedicated experiments on the water impact of a buoyant cylinder, to validate the proposed methodology in a more general framework. Finally, to demonstrate that the proposed numerical model could be used for a wide range of engineering problems related to FSI in multiphase flows, we tested the proposed numerical model for the simulation of a floating body.

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Lattice Boltzmann modeling of water entry problems

Cited by 37 publications

References 33 publications

Assessment of PIV-based analysis of water entry problems through synthetic numerical datasets

Assessment of PIV-based analysis of water entry problems through synthetic numerical datasets

Front-tracking lattice Boltzmann simulation of a wedge water entry

Fluid Structure Interaction of Buoyant Bodies with Free Surface Flows: Computational Modelling and Experimental Validation

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