Journal ArticleDOI
Validation of closure models for interfacial drag and turbulence in numerical simulations of horizontal stratified gas–liquid flows
Thomas Höhne,Jan-Peter Mehlhoop +1 more
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In this article, an algebraic interfacial area density (AIAD) approach was used to predict key flow features like liquid hold-up and free surface waviness, and an evaluation of the velocity and turbulence fields predicted by the AIAD model against experimental data was done.About:
This article is published in International Journal of Multiphase Flow.The article was published on 2014-06-01. It has received 68 citations till now. The article focuses on the topics: Turbulence kinetic energy & Turbulence.read more
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A strategy for the qualification of multi-fluid approaches for nuclear reactor safety
Dirk Lucas,Roland Rzehak,Eckhard Krepper,Thomas Ziegenhein,Yixiang Liao,Shl Sebastian Kriebitzsch,Pavel Apanasevich +6 more
TL;DR: In this paper, the authors propose a baseline model for polydisperse bubbly flows which is presently developed at HZDR and demonstrate that a modification of the baseline model will only be done if it bases on physical considerations and improves the overall performance of the model.
Journal ArticleDOI
Numerical research on thermal mixing characteristics in a 45-degree T-junction for two-phase stratified flow during the emergency core cooling safety injection
TL;DR: In this paper, the feasibility of two-phase CFD models is validated by the experimental data obtained from the XJTU-ECC experimental apparatus and an empirical correlation is proposed to predict the condensation rate in case that the thermodynamic ratio is lower than 0.55.
Journal ArticleDOI
A large scale interface multi-fluid model for simulating multiphase flows
TL;DR: The scope of the Eulerian Multiphase model in STAR-CCM+ is extended to simulate multi-scale two-phase flows using Large Scale Interface (LSI) model, which provides a criteria based on local phase-distribution to distinguish between regimes characterized by small and large scale interfaces.
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Simulation of bubbly flows with special numerical treatments of the semi-conservative and fully conservative two-fluid model
TL;DR: In this paper, the authors investigated the two-fluid model (TFM) under challenging conditions such as phase segregation and inversion, and presented a robust methodology for semi-conservative and fully conservative formulations.
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Reynolds-averaged modeling of turbulence damping near a large-scale interface in two-phase flow
TL;DR: In this paper, the Egorov approach is extended to the k- e model, which may be relevant for a large array of engineering applications in which the k − e model is more effective than the k - ω model.
References
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Journal ArticleDOI
Two-equation eddy-viscosity turbulence models for engineering applications
TL;DR: In this paper, two new two-equation eddy-viscosity turbulence models are presented, which combine different elements of existing models that are considered superior to their alternatives.
Journal ArticleDOI
Fronts propagating with curvature-dependent speed: algorithms based on Hamilton-Jacobi formulations
Stanley Osher,James A. Sethian +1 more
TL;DR: The PSC algorithm as mentioned in this paper approximates the Hamilton-Jacobi equations with parabolic right-hand-sides by using techniques from the hyperbolic conservation laws, which can be used also for more general surface motion problems.
Journal ArticleDOI
Volume of fluid (VOF) method for the dynamics of free boundaries
C.W Hirt,B. D. Nichols +1 more
TL;DR: In this paper, the concept of a fractional volume of fluid (VOF) has been used to approximate free boundaries in finite-difference numerical simulations, which is shown to be more flexible and efficient than other methods for treating complicated free boundary configurations.
Journal ArticleDOI
Numerical Calculation of Time‐Dependent Viscous Incompressible Flow of Fluid with Free Surface
Francis H. Harlow,J. Eddie Welch +1 more
TL;DR: In this paper, a new technique is described for the numerical investigation of the time-dependent flow of an incompressible fluid, the boundary of which is partially confined and partially free The full Navier-Stokes equations are written in finite-difference form, and the solution is accomplished by finite-time step advancement.