Sharp interface immersed-boundary/level-set method for wave–body interactions

Yang, Jianming; Stern, Frederick

doi:10.1016/j.jcp.2009.05.047

Cited by 158 publications

(106 citation statements)

References 54 publications

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“…The bubble was released at an initial position (x/R, y/R) = (6.0, 1.5). As the bubble rose, its deformation, vertical displacement and rising speed agreed with the results by Gueyffier et al (1999) and Yang & Stern (2009).…”

Section: Level Set Methodssupporting

confidence: 86%

“…In addition, two canonical interface tracking problems were also examined: the transport of Zalesak's disk (Zalesak 1979) and the rise of an air bubble in quiescent water (Gueyffier et al 1999;Yang & Stern 2009). In the case of the Zalesak's disk, the size of the computational domain was (L x , L y )=(100, 100) and the number of grid points was (N x ,N y )=(257, 257).…”

Section: Level Set Methodsmentioning

confidence: 99%

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The effect of a low-viscosity near-wall film on bypass transition in boundary layers

Jung

Zaki

2015

J. Fluid Mech.

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Bypass transition in a two-fluid boundary layer is examined using direct numerical simulations. A less viscous wall film is considered and the impact on transition location is evaluated at two different viscosity ratios and free-stream turbulence intensities. The less viscous wall film absorbs the mean shear from the outer stream, weakens the lift-up mechanism, and alters the disturbance field inside the boundary layer. These effects all favour a delay in the onset of bypass transition. However, the viscosity and mean-shear discontinuities across the two-fluid interface introduce a new mechanism for the generation of wall-normal vorticity in the boundary layer, and can therefore promote transition to turbulence. Conditionally-averaged statistics and streak tracking techniques are adopted in order to examine the impact of the wall film on the bypass transition process. It is shown that the weaker amplification of the streaks in the outer fluid can delay breakdown to turbulence, despite the additional disturbance generation at the two-fluid interface. The efficacy of the wall film in delaying transition is demonstrated at moderate level of free-stream turbulence intensity, but is reduced as the turbulence intensity is increased.

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Section: Level Set Methodssupporting

confidence: 86%

Section: Level Set Methodsmentioning

confidence: 99%

The effect of a low-viscosity near-wall film on bypass transition in boundary layers

Jung

Zaki

2015

J. Fluid Mech.

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“…A similar approach is used by van der Pijl et al in [221]. A finite difference method is used by Yang and Stern [232] for solving the NS equations by a fractional-step method, as well as the LS equation for tracking the interface, together with the GFM near the fluid-fluid interface. The solid-fluid interface is treated as an immersed boundary, and a Lagrangian Smagorinsky subgrid scale model is used for Large Eddy Simulations (LES).…”

Section: Fixed Discretization Methodsmentioning

confidence: 99%

Numerical Modeling and Experimental Validation of Free Surface Flow Problems

Cruchaga

Battaglia

Storti

et al. 2014

Arch Computat Methods Eng

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In this paper we present a summary of numerical methods for solving free surface and two fluid flow problems. We will focus the attention on level set formulations extensively used in the context of the finite element method. In particular, numerical developments to achieve accurate solutions are described. Specific topics of the algorithms, like mass preservation and interface redefinition, are evaluated. To illustrate these aspects, numerical strategies previously developed are applied to the solution of a sloshing and a water column collapse problems. To assess the capabilities of these techniques, the numerical results are compared against each other and with experimental data. Considering these aspects, the present work is aimed to outline some well reported aspects of level set-like formulations.Fil: Cruchaga, Marcela. Universidad de Santiago de Chile; ChileFil: Battaglia, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones En Metodos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones En Metodos Computacionales; ArgentinaFil: Storti, Mario Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones En Metodos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones En Metodos Computacionales; ArgentinaFil: D'elia, Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones En Metodos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones En Metodos Computacionales; Argentin

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“…The CFDShip-Iowa V6.2 [22] is an orthogonal curvilinear grid solver, which is extended from the sharp interface Cartesian grid solver (Version 6.1) for incompressible two-phase viscous flows recently developed at the University of Iowa [23]. In this solver, the interface is tracked by a new volume-of-fluid (VOF) method [24].…”

Section: Cfdship-iowa V62mentioning

confidence: 99%

URANS studies of hydrodynamic performance and slamming loads on high-speed planing hulls in calm water and waves for deep and shallow conditions

Mousaviraad

Wang

Stern

2015

Applied Ocean Research

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a b s t r a c t URANS capability for hydrodynamic performance and slamming of high speed planing crafts are assessed, using metrics specified for naval applications. Wedge drop validation studies using two different solvers, one single-phase and the other two-phase, shows good agreement with experimental data for time history of pressure gauges. Planing hull validation studies are carried out using the historical benchmark experiments of Fridsma. Simulation conditions include calm water in deep and shallow conditions with fixed and free to sinkage and trim motions, as well as regular and irregular head waves in deep water free to heave and pitch motions. For simulations in calm deep water free to sinkage and trim, grid studies show that refined grid density on the hull, especially over the spray root area, chines, and transom stern are necessary for accurate solutions. Detailed verification and validation studies are carried out with satisfactory results since monotonic convergence and validation are achieved for most of the variables. Additional assessment metrics are studied including wave rise, hull pressure distribution, surface streamlines, existence of porpoising, and main spray trajectory. The results are compared with empirical expressions with reasonably good agreement except for main spray trajectory. Resolving the details of the spray flow is beyond the scope of the current work since finer grid resolution and/or more advanced free surface modeling is required. For simulations in calm deep water with fixed sinkage and trim, the assessment metrics include drag and lift forces, pitch moment, drag-lift ratio, and center of pressure. The results agree well with empirical expressions. For simulations in shallow water, similar studies are carried out and reasonable comparison results are obtained. Seakeeping simulations in regular head waves are carried out and validated with experimental data for response amplitudes and phases, with good agreement. Simulations in irregular head waves are carried out for two different weight configurations and validated against experiments for mean and amplitudes of resistance, heave, pitch, and acceleration. Slamming load analysis is carried out, where both emerging and re-entering slams are detected, although the current experimental data lack slamming pressures for validation. More recent research provides additional studies for calm water motions, slamming pressures, and spray flow trajectory that supports current results.

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Sharp interface immersed-boundary/level-set method for wave–body interactions

Cited by 158 publications

References 54 publications

The effect of a low-viscosity near-wall film on bypass transition in boundary layers

The effect of a low-viscosity near-wall film on bypass transition in boundary layers

Numerical Modeling and Experimental Validation of Free Surface Flow Problems

URANS studies of hydrodynamic performance and slamming loads on high-speed planing hulls in calm water and waves for deep and shallow conditions

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