Development of a CFD – LES model for the dynamic analysis of the DYNASTY natural circulation loop

Battistini, Alfredo; Cammi, Antonio; Lorenzi, Stefano; Colombo, Marco; Fairweather, Michael

doi:10.1016/j.ces.2021.116520

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…Where, S pp ( f ) is the sound pressure power spectral density, and p ref = 2 × 10 −5 Pa is the reference acoustic pressure value. The spectral density of sound power and sound power level is calculated as given as follows 28 :…”

Section: Methodsmentioning

confidence: 99%

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Investigation of aerodynamic and aeroacoustic behavior of bio-inspired airfoils with numerical and experimental methods

Güzey,

Aylı,

Kocak

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This article presents numerical and experimental studies on the aerodynamic and aeroacoustic characteristics of the NACA0012 profile with owl-inspired leading-edge serrations for aeroacoustic control. The leading-edge serrations under investigation are in a sinusoidal profile with two main design parameters of wavelength and amplitude. The noise-suppressing ability of sinusoidal serrations is a function of several parameters such as amplitude, wavelength, inflow speed, angle of attack, which are examined in this study. Amplitude (A) and wavelength (λ) of the serration are varied between 1.25 and 2.5, 20 < λ < 60, respectively. The corresponding Reynolds numbers are between 1 and 3 × 105. The angle of attack for each configuration is changed between 4° and 16°. Forty different configurations are tested. According to the results, owl-inspired leading-edge serrations can be used as aeroacoustic control add-ons in blade designs for wind turbines, aircraft, and fluid machinery. Results show that the narrower and sharper serrations have a better noise reduction effect. Overall sound pressure level (SPL) reduces up to 20% for the configuration with the largest amplitude and smaller wavelength. The results also showed that serration amplitude had a distinct effect on aeroacoustic performance, whereas wavelength is a function of amplitude. At the smaller angle of attack values, AOA < 8°, the lift and drag coefficients are almost the same for both clean and wavy profiles. On the other hand, typically for angle of attack values more than 12° (after stall), when the angle of attack is increased, serration adversely affects aerodynamic performance.

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Section: Methodsmentioning

confidence: 99%

“…The Large Eddy Simulation (LES) method is suitable for aeroacoustic problems, as it directly simulates the large eddies while the sub-scale eddies are modeled through the Sub-Grid (SGS) stress model. 28…”

Section: Methodsmentioning

confidence: 99%

Investigation of aerodynamic and aeroacoustic behavior of bio-inspired airfoils with numerical and experimental methods

Güzey,

Aylı,

Kocak

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The problem of natural circulation stability is a well-known and studied issue (Welander, 1967;Vijayan, 2002;Schmid and Brandt, 2014;Cammi et al, 2016b;Battistini et al, 2021). In natural circulation, the driving force is due to density gradients in the fluid which in turn are due to temperature differences.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, while DYNASTY can operate in three different heating configurations [horizontal heater horizontal cooler (HHHC), vertical heater horizontal cooler (VHHC), and distributed heating (DH)], eDYNASTY only operates in the VHHC configuration. The study of natural circulation on the single DYNASTY loop has already been tackled numerically with a 1D approach (Pini, 2017;Cauzzi, 2019;Benzoni et al, 2023) and a 3D one (Pini, 2017;Cauzzi, 2019;Battistini et al, 2021;Nalbandyan et al, 2022). The analysis of the DYNASTY facility has also been performed experimentally (Cauzzi, 2019;Benzoni et al, 2022a).…”

Section: Introductionmentioning

confidence: 99%

1D modelling and preliminary analysis of the coupled DYNASTY–eDYNASTY natural circulation loop

et al. 2023

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In the continuous strive to improve the safety of current-generation and next-generation nuclear power plants, natural circulation can be used to design passive safety systems to remove the decay heat during the shutdown. The Molten Salt Fast Reactor (MSFR) is a peculiar type of Gen-IV nuclear facility, where the fluid fuel is homogeneously mixed with the coolant. This design leads to natural circulation in the presence of an internally distributed heat source during the shutdown. Furthermore, to shield the environment from the highly radioactive fuel, an intermediate loop between the primary and the secondary loops, able to operate in natural circulation, is required. To analyze the natural circulation with a distributed heat source and to study the natural circulation of coupled systems and the influence of the intermediate loop on the behaviour of the primary, Politecnico di Milano designed and built the DYNASTY-eDYNASTY facility. The two facilities are coupled with a double-pipe heat exchanger, which siphons heat from DYNASTY and delivers it to the eDYNASTY loop. This work focuses on modelling the coupled DYNASTY-eDYNASTY natural circulation loops using DYMOLA2023®, an integrated development environment based on the Modelica Object-Oriented a-causal simulation language. The 1D Modelica approach allows for building highly reusable and flexible models easing the design effort on a complex system such as the DYNASTY-eDYNASTY case without the need to rewrite the whole model from scratch. The coupled models were developed starting from the already-validated single DYNASTY model and the double-pipe heat exchanger coupling. The models were tested during the whole development process, studying the influence of the numerical integration algorithm on the simulation behaviour. A preliminary analysis of both the adiabatic and the heat loss models analyzed the effect of the secondary natural circulation loop on the behaviour of the DYNASTY loop. The simulation results showed that the eDYNASTY loop dampens the behaviour of the primary DYNASTY loop. Furthermore, a parametric analysis of the DYNASTY and the eDYNASTY coolers highlighted the influence of the cooling configuration on the facility’s behaviour. Finally, the simulation results identified the most critical aspects of the models in preparation for an experimental comparison.

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“…Proper selection of process methods and parameters often results in better product yield and quality and fewer byproducts (including environmentally harmful ones) and often reduces the number of production stages required. Recently, computational models in combination with computational fluid dynamics (CFD) have been increasingly used for this purpose [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Disulphide Precipitation in Jet Reactors: Introduction of Kinetics Model for Computational Fluid Dynamics Calculations

Wojtalik¹,

Wojtas²,

Gołębiowska³

et al. 2022

Molecules

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In our previous work, we used the population balance method to develop a molybdenum disulphide kinetics model consisting of a set of differential equations and constants formulated to express the kinetics of complex chemical reactions leading to molybdenum disulphide precipitation. The purpose of the study is to improved the model to describe the occurring phenomena more thoroughly and have introduced computational fluid dynamics (CFD) modelling to conduct calculations for various reactor geometries. CFD simulations supplemented with our nucleation and growth kinetics model can predict the impact of mixing conditions on particle size with good accuracy. This introduces another engineering tool for designing efficient chemical reactors.

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Development of a CFD – LES model for the dynamic analysis of the DYNASTY natural circulation loop

Cited by 11 publications

References 26 publications

Investigation of aerodynamic and aeroacoustic behavior of bio-inspired airfoils with numerical and experimental methods

Investigation of aerodynamic and aeroacoustic behavior of bio-inspired airfoils with numerical and experimental methods

1D modelling and preliminary analysis of the coupled DYNASTY–eDYNASTY natural circulation loop

Molybdenum Disulphide Precipitation in Jet Reactors: Introduction of Kinetics Model for Computational Fluid Dynamics Calculations

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