CFD Code Validation against Stratified Air-Water Flow Experimental Data

Terzuoli, F.; Galassi, Maria Cristina; Mazzini, Davide; D'Auria, Francesco Saverio

doi:10.1155/2008/434212

Cited by 14 publications

(7 citation statements)

References 3 publications

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“…Therefore Holmås et al [10] concluded that the turbulence models had to be modified in order to correctly predict the turbulence at the gas-liquid interface. The same conclusion was drawn by Terzuoli et al [13], who used the commercial codes CFX 10.0 and Fluent 6.1 to simulate the experiment of air-water in a channel by Fabre et al [14]. The VOF method was employed, with the k-ω SST model for the turbulence.…”

Section: Introductionmentioning

confidence: 75%

Comparison of Computational Fluid Dynamics Simulations and Experiments for Stratified Air-Water Flows in Pipes

Chinello

Ayati

McGlinchey

et al. 2018

Journal of Fluids Engineering

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Stratified gas–liquid flow is a flow regime typically encountered in multiphase pipelines. The understanding and modeling of this regime is of engineering importance especially for the oil and gas industry. In this work, simulations have been conducted for stratified air–water flow in pipes. We solved the Reynolds-averaged Navier–Stokes (RANS) equations with the volume of fluid (VOF) method. The aim of this work was to evaluate the performance of the k–ω shear stress transport (SST) turbulence model with and without damping of the turbulence at the gas–liquid interface. Simulation results were compared with some of the latest experimental results found in the literature. A comparison between the simulated velocity and kinetic energy profiles and the experimental results obtained with the particle image velocimetry (PIV) technique was conducted. The characteristics of the interfacial waves were also extracted and compared with the experiments. It is shown that a proper damping of the turbulence close to the interface is needed to obtain agreement with the experimental pressure drop and liquid hold-up. In its current form, however, RANS with the k–ω turbulence model is still not able to give an accurate prediction of the velocity profiles and of the interface waves.

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Section: Introductionmentioning

confidence: 75%

Comparison of Computational Fluid Dynamics Simulations and Experiments for Stratified Air-Water Flows in Pipes

Chinello

Ayati

McGlinchey

et al. 2018

Journal of Fluids Engineering

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show abstract

“…( 5). Terzuoli et al [39] defined the lift force acting on a secondary phase p in a primary phase q as:…”

Section: Simulation Approachmentioning

confidence: 99%

Two-Phase Flow Development of R134a in a Horizontal Pipe: Computational Investigation

Mahmood¹,

Saleh²,

Musa³

et al. 2021

IJHT

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To improve the performance of vapor compression refrigeration systems that use vertical gravitational flash tank separators, the liquid separation efficiency of the vertical gravitational flash tank separator requires to be approved. To approach this improvement, the two-phase flow development and its behavior after the expansion device need to be investigated and predicted. For thus, this paper presents a three-dimensional computational investigation of the two-phase flow development of R134a after the expansion device in a horizontal pipe. Computational Fluid Dynamic (CFD) was used to predict the two-phase development and its behavior in the horizontal pipe. ANSYS 16.2 program was used to generates the geometry of the three-dimensional horizontal pipe of 2 meters long and 25 mm inner diameter. The hexahedral mesh was generated and it is assessed to obtain the optimum mesh size and number. Eulerian-Eulerian two-phase model was used with k-ɛ turbulence model. R134a was used as a working fluid in the horizontal pipe utilizing four different inlet diameters: 12, 12.5, 25, and 50.0 mm. Mass flux and vapor quality have been changed from 288 to 447 kg/m2.s and from 10 to 20% respectively. Results were validated against experimental results from the literature and revealed that the separation region length is affected by the initial phase velocities, inlet vapor quality, and inlet tube diameter. An empirical correlation to predict the expansion region length is proposed as a function of Froude, Webber, and Lockhart-Martinelli numbers.

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“…The mentioned code has been chosen because the CFX solver [24], which is part of ANSYS/CFX, has demonstrated satisfactory results during its verification by test simulations of the standard international problem ISP-47 and its analogs under an IAEA task order [2,13,25]. The second step is solving a model heat transfer problem, the sketch of which is shown in Figure 2.…”

Section: Accounting For the Effects Of The Containment's Steel Linermentioning

confidence: 99%

“…The paper describes an approach to fluid dynamics simulations of processes occurring inside the nuclear power plant (NPP) containment during operation of spray systems in severe accidents. This topic is relevant at the current stage of advancement in high-accuracy numerical simulations of NPP operation [1][2][3]. In the case of interest, accidental releases mostly occur as a result of a coolant leak or line rupture in the main coolant circuit of the reactor building.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Spray System Operation under Hydrogen and Steam Emissions in NPP Containment during Severe Accident

Seleznev¹,

Aleshin²,

Pryalov³

2011

Science and Technology of Nuclear Installations

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The paper describes one of the variants of mathematical models of a fluid dynamics process inside the containment, which occurs in the conditions of operation of spray systems in severe accidents at nuclear power plant. The source of emergency emissions in this case is the leak of the coolant or rupture at full cross-section of the main circulating pipeline in a reactor building. Leak or rupture characteristics define the localization and the temporal law of functioning of a source of emergency emission (or accrued operating) of warmed up hydrogen and steam in the containment. Operation of this source at the course of analyzed accident models should be described by the assignment of the relevant Dirichlet boundary conditions. Functioning of the passive autocatalytic recombiners of hydrogen is described in the form of the complex Newton boundary conditions.

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CFD Code Validation against Stratified Air-Water Flow Experimental Data

Cited by 14 publications

References 3 publications

Comparison of Computational Fluid Dynamics Simulations and Experiments for Stratified Air-Water Flows in Pipes

Comparison of Computational Fluid Dynamics Simulations and Experiments for Stratified Air-Water Flows in Pipes

Two-Phase Flow Development of R134a in a Horizontal Pipe: Computational Investigation

Modeling of Spray System Operation under Hydrogen and Steam Emissions in NPP Containment during Severe Accident

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