Comparative Simulations of Free Surface Flows Using VOF-Methods and a New Approach for Multi-Scale Interfacial Structures

Hänsch, Susann; Lucas, Dirk; Höhne, Thomas; Krepper, Eckhard; Montoya, Gustavo

doi:10.1115/fedsm2013-16104

Cited by 9 publications

(9 citation statements)

References 14 publications

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“…The corresponding models for a i and C D are given in Table 1. The special model term for bubbles, droplets and interfaces is correlated by weighting functions of the three flow morphologies [5,7,15].…”

Section: The Algebraic Interfacial Area Density Modelmentioning

confidence: 99%

“…Within the framework of the Euler-Euler approach or the two-fluid model [2,3], there is one set of balance equations for each phase of the two-phase flows, which depend on the phase fraction. Currently, the detection of phase interfaces at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) is carried out using both the AIAD (Algebraic Interfacial Area Density) [4][5][6] and the GENTOP (GENeralized TwO-Phase flow) model [7].…”

Section: Introductionmentioning

confidence: 99%

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Validation of AIAD Sub-Models for Advanced Numerical Modelling of Horizontal Two-Phase Flows

Höhne

Porombka

Sáez

2020

Fluids

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In this work, the modelling of horizontal two-phase flows within the two-fluid Euler–Euler approach is investigated. A modified formulation of the morphology detection functions within the Algebraic Interfacial Area Density (AIAD) model is presented in combination with different models for the drag force acting on a sheared gas–liquid interface. In the case of free surface flows, those closure laws are often based on experimental correlations whose applicability is limited to certain flow regimes. It is investigated here whether the implementation of the modified blending functions in ANSYS CFX avoids this limitation. The influence of the new functions on the prediction of turbulence parameters in free surface flows is also examined quantitatively for the k-ω and k-ε two-equation turbulence models. Transient simulations of the WENKA counter-current stratified two-phase flow experiment were performed for validation. A prediction of the correct flow pattern as observed in the experiment improved dramatically when a turbulence damping term was included in the standard two-equation models. Using the k-ω and a modified k-ε turbulence model with damping terms close to the interface, better agreement with the experimental data was achieved. The morphology detection mechanism of the unified blending functions within the AIAD is seen as an improvement with respect to the detection of sharp interfaces. Satisfactory quantitative agreement is achieved for the modified free surface drag. Furthermore, it is demonstrated that turbulence dampening has to be accounted for in both turbulence models to qualitatively reproduce the mean flow and turbulence quantities from the experiment.

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Section: The Algebraic Interfacial Area Density Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of AIAD Sub-Models for Advanced Numerical Modelling of Horizontal Two-Phase Flows

Höhne

Porombka

Sáez

2020

Fluids

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“…1, the scheme shows antidiffusive behavior, in fact, when b = 2, it is as antidiffusive as the first-order upwind scheme is diffusive. 42 According to the nature of the problem, the simulations have been conducted in a steady-state condition and stopped when a favorable convergence of lift and resistance is achieved. When such physical convergence criterion is satisfied, the relative residuals of the continuity and momentum equations (as numerical convergence criteria) have always been under 10 25 .…”

Section: Numerical Model and Test Casesmentioning

confidence: 99%

“…The compressiveness of the scheme comes from the fact that for β > 1, the scheme shows antidiffusive behavior, in fact, when β = 2, it is as antidiffusive as the first-order upwind scheme is diffusive. 42…”

Section: Numerical Model and Test Casesmentioning

confidence: 99%

Numerical study on interference effects and wetted area pattern of asymmetric planing catamarans

Yengejeh

Amiri

Mehdigholi

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part M:

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Asymmetrical planing catamarans are increasingly used in moderate to very high-speed applications due to some tempting qualities such as less wetted surface and better seakeeping behavior. The present numerical study attempts to provide new insight into hydrodynamics of such vessels by highlighting the distinguishing aspects and employing novel appropriate approaches to deal with them. A systematic investigation has been carried out on a prismatic geometry at various demihull separations (including zero separation, that is, symmetric monohull) and different trim angles in a wide range of speed coefficients, using a computational fluid dynamics solver. Obtained numerical results of steady-state resistance and lift forces are compared against different empirical methods. In order to offer an adequate explanation about the nature of forces and interference mechanisms, an analysis has been performed on viscous and pressure resistance components. Furthermore, the ability of the employed numerical method in estimation of wetted area pattern at the bottom of the planing hulls has been evaluated to provide explanation for some observed hydrodynamic behaviors of the asymmetric planing catamarans. It is seen that a significant reduction is reached in wetted surface area of catamaran configuration in comparison with corresponding monohull.

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“…A modification of the method, namely PLIC-VOF (Piecewise-Linear Interface Calculation), is proposed, according to which a free surface in a control volume is represented as a set of arbitrary oriented segments. The PLIC-VOF method has been successfully applied for two-dimensional flows in [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Simulation of a Tank Filling With a Viscous Fluid Using the VOF Method

Борзенко

Hegaj

2020

Journal of Siberian Federal University. Mathematics &Amp; Physics

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This paper presents the results of 3D modeling of a Newtonian fluid flow with a free surface. The PLIC-VOF algorithm, which is developed to solve the problems of two-dimensional fluid flows with a free surface, is generalized to the case of three-dimensional flows. Efficiency of the developed algorithm and reliability of the obtained results are justified by comparing with available data in literature and by testing approximation convergence. Parametric calculations of a rectangular channel filling show that the free surface assumes a steady convex shape over time and then moves along the channel at a constant velocity. As a result of parametric studies, the dependences of geometric characteristics of the free surface shape on problem parameters have been plotted

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Comparative Simulations of Free Surface Flows Using VOF-Methods and a New Approach for Multi-Scale Interfacial Structures

Cited by 9 publications

References 14 publications

Validation of AIAD Sub-Models for Advanced Numerical Modelling of Horizontal Two-Phase Flows

Validation of AIAD Sub-Models for Advanced Numerical Modelling of Horizontal Two-Phase Flows

Numerical study on interference effects and wetted area pattern of asymmetric planing catamarans

Three-Dimensional Simulation of a Tank Filling With a Viscous Fluid Using the VOF Method

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