Direct numerical simulation of reactor two-phase flows enabled by high-performance computing

Fang, Jun; Cambareri, Joseph J.; Brown, C. S.; Feng, Jinyong; Gouws, Andre; Li, Mengnan; Bolotnov, Igor A.

doi:10.1016/j.nucengdes.2018.02.024

Cited by 43 publications

(9 citation statements)

References 37 publications

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“…More recently, a slug-to-churn flow regime transition study reported favorable agreement between PHASTA results and the existing experimental and analytical results for complex two-phase flow regimes (Zimmer and Bolotnov, 2019). The two-phase flow simulation capability can also be extended to even larger engineering problems, such as nuclear reactor subchannels (Fang et al, 2017(Fang et al, , 2018(Fang et al, , 2020.…”

Section: Flow Solver and Interface Capturing Approachmentioning

confidence: 64%

Complex bubble deformation and break-up dynamics studies using interface capturing approach

Fan

Fang

Bolotnov

2020

Exp. Comput. Multiph. Flow

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The dynamics of bubble deformation has significant impacts on two-phase flow fundamentals such as bubble induced turbulence and flow regime transition. Despite the significant progress achieved by experimental studies on bubble deformation, certain limitations still exist especially for wide-range datasets. To significantly expand the flow conditions available from experiments, direct numerical simulation (DNS) is utilized to study the bubble-liquid interactions using finiteelement solver with level-set interface capturing method. Different from conventional investigations of bubble rising and deforming in stagnant liquids, a proportional-integral-derivative (PID) bubble controller is leveraged to maintain the bubble location in uniform liquid flow. This paper evaluates the reliability and reproducibility of the PID bubble controller for complex bubble deformation studies through a comprehensive set of verification and validation studies. An improved bubble deformation map is developed, based on Weber number and bubble Reynolds number, showing six zones for different deformation and break-up mechanisms. This research aims at producing virtual experiment level data source using interface resolved DNS and shedding light into the physics of interface dynamics. The insights obtained can be further incorporated in improved multiphase CFD models to guide the engineering designs and industrial processes where bubble deformation and break-up play a pivotal role.

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Section: Flow Solver and Interface Capturing Approachmentioning

confidence: 64%

Complex bubble deformation and break-up dynamics studies using interface capturing approach

Fan

Fang

Bolotnov

2020

Exp. Comput. Multiph. Flow

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“…The magnitude of the turbulence enhancement increased with the liquid turbulent intensity and the relative velocity [155]. Apart from the direct study of turbulence, DNS plays an indispensable role in evaluating and developing turbulence models [156][157][158][159][160][161] and in providing complementary information for experimental study [162][163][164].…”

Section: Dns Approachmentioning

confidence: 99%

Mathematical Methodology and Metallurgical Application of Turbulence Modelling: A Review

Wang

Cao

Cheng

et al. 2021

Metals

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This paper focusses on three main numerical methods, i.e., the Reynolds-Averaged Navier-Stokes (RANS), Large Eddy Simulation (LES), and Direct Numerical Simulation (DNS) methods. The formulation and variation of different RANS methods are evaluated. The advantage and disadvantage of RANS models to characterize turbulent flows are discussed. The progress of LES with different subgrid scale models is presented. Special attention is paid to the inflow boundary condition for LES modelling. Application and limitation of the DNS model are described. Different experimental techniques for model validation are given. The consistency between physical experimentation/modelling and industrial cases is discussed. An emphasis is placed on the model validation through physical experimentation. Subsequently, the application of a turbulence model for three specific flow problems commonly encountered in metallurgical process, i.e., bubble-induced turbulence, supersonic jet transport, and electromagnetic suppression of turbulence, is discussed. Some future perspectives for the simulation of turbulent flow are formulated.

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“…After coupling with the level-set method, two-phase flow modeling becomes available in PHASTA [23]. A broad range of two-phase phenomena including the interaction between bubbles and flow [24], reactor bubbly flow [25] and two-phase heat transfer problems [26,27], bubble release frequency [28,29] can be simulated and investigated using PHASTA.…”

Section: Phasta Overviewmentioning

confidence: 99%

Nucleate boiling simulation using interface tracking method

Moortgat

Bolotnov

2020

Nuclear Engineering and Design

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Direct numerical simulation of reactor two-phase flows enabled by high-performance computing

Cited by 43 publications

References 37 publications

Complex bubble deformation and break-up dynamics studies using interface capturing approach

Complex bubble deformation and break-up dynamics studies using interface capturing approach

Mathematical Methodology and Metallurgical Application of Turbulence Modelling: A Review

Nucleate boiling simulation using interface tracking method

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