A dynamic interface compression method for VOF simulations of high-speed planing watercraft

Lee, Heebum; Rhee, Shin Hyung

doi:10.1007/s12206-015-0405-6

Cited by 25 publications

(14 citation statements)

References 2 publications

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“…where α is 1 in the water phase, 0 in the air phase, and 0 < α < 1 in the interface region. The third term is an anti-diffusion source term that artificially reduces the solution smearing of the volume fraction transport equation [10][11][12]. In this study, the value of 0.5 was used.…”

Section: Governing Equationsmentioning

confidence: 99%

Platform Motions and Mooring System Coupled Solver for a Moored Floating Platform in a Wave

2021

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In advance of building moored floating offshore platforms, in recent years, there has been a greater demand for two-way coupled simulations between a motion solver based on the viscous flow theory and a mooring line model, including cable dynamics. This paper introduces open-source libraries such as MoorDyn (the lumped-mass mooring line model) and OpenFOAM (the computational fluid dynamics libraries). It describes the methods by which they can be coupled bi-directionally. In each time step, the platform motions calculated by OpenFOAM are transferred to MoorDyn as the boundary conditions for the mooring system analysis. In contrast, MoorDyn calculates the restoring force and moment due to the mooring system and transfers them to OpenFOAM. The restoring force and moment act on the platform as the external force and moment for the platform motions in the next time step. The static tension and profile of the mooring system, dynamic tension of the mooring system, and free decay motions of the floating buoy in the still water were simulated to check the accuracy of OpenFOAM and MoorDyn. The coupled solver was used to produce simulations of the moored decay motions of the floating buoy in the still water and the moored motions with the Stokes 5th order wave. All simulation results were compared and showed good agreement with the numerical solution and experiment results. In addition, the characteristics of each solver were investigated.

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Section: Governing Equationsmentioning

confidence: 99%

Platform Motions and Mooring System Coupled Solver for a Moored Floating Platform in a Wave

2021

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“…Anez et al [25] switched the IC coefficient using two criteria: the ratio between minimum interface and actual interface and the grid dependent based on interface resolution quality. Lee and Rhee [26] implemented a dynamic IC method, which is currently drawing much attention, into SNUFOAM-6DOF, which can calculate the 6 degrees of freedom of a ship's motion to derive the IC coefficient from cell size and flow velocity. However, there are still no strategies to define the general IC coefficient [27].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on an Interface Compression Method for the Volume of Fluid Approach

Okagaki

Yonomoto

Ishigaki

et al. 2021

Fluids

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Many thermohydraulic issues about the safety of light water reactors are related to complicated two-phase flow phenomena. In these phenomena, computational fluid dynamics (CFD) analysis using the volume of fluid (VOF) method causes numerical diffusion generated by the first-order upwind scheme used in the convection term of the volume fraction equation. Thus, in this study, we focused on an interface compression (IC) method for such a VOF approach; this technique prevents numerical diffusion issues and maintains boundedness and conservation with negative diffusion. First, on a sufficiently high mesh resolution and without the IC method, the validation process was considered by comparing the amplitude growth of the interfacial wave between a two-dimensional gas sheet and a quiescent liquid using the linear theory. The disturbance growth rates were consistent with the linear theory, and the validation process was considered appropriate. Then, this validation process confirmed the effects of the IC method on numerical diffusion, and we derived the optimum value of the IC coefficient, which is the parameter that controls the numerical diffusion.

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“…This is done by adding an artificial compressive term to the VOF equation [21,22], which is active only near the interface. This method is used in OpenFOAM software [23] and further advances are made to this method to ensure correct compressive flux [24,25]. In this paper, the interface compression methodology is adopted as it fits naturally within the underlying framework.…”

Section: Introductionmentioning

confidence: 99%

Modified HLLC-VOF solver for incompressible two-phase fluid flows

Bhat,

Mandal

2019

Preprint

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A modified HLLC-type contact preserving Riemann solver for incompressible two-phase flows using the artificial compressibility formulation is presented. Here, the density is omitted from the pressure evolution equation. Also, while calculating the eigenvalues and eigenvectors, the variations of the volume fraction is taken into account. Hence, the equations for the intermediate states and the intermediate wave speed are different from the previous HLLC-VOF formulation [Bhat S P and Mandal J C, J. Comput. Phys. 379 (2019), pp. 173-191]. Additionally, an interface compression algorithm is used in tandem to ensure sharp interfaces. The modified Riemann solver is found to be robust compared to the previous HLLC-VOF solver, and the results produced are superior compared to non-contact preserving solver. Several test problems in two-and three-dimensions are solved to evaluate the efficacy of the solver on structured and unstructured meshes.

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A dynamic interface compression method for VOF simulations of high-speed planing watercraft

Cited by 25 publications

References 2 publications

Platform Motions and Mooring System Coupled Solver for a Moored Floating Platform in a Wave

Platform Motions and Mooring System Coupled Solver for a Moored Floating Platform in a Wave

Numerical Study on an Interface Compression Method for the Volume of Fluid Approach

Modified HLLC-VOF solver for incompressible two-phase fluid flows

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