Comparative Study of Different Turbulence Models for Cavitational Flows around NACA0012 Hydrofoil

Zhao, Minsheng; Wan, Decheng; Gao, Yangyang

doi:10.3390/jmse9070742

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…In CFD problems, k-ω and k-ɛ are the predominant most used turbulent models. The main difference between these valid alternatives is that the k-Epsilon model resolves the viscous layer less precisely than the k-Omega model [7]. Moreover, changing to a different turbulence model cannot rectify a poor-quality mesh, particularly if the alternative model also employs wall functions.…”

Section: Solver Settingmentioning

confidence: 99%

Preliminary Analysis and Optimization via CFD of a Liquid Hydrogen Pressure Regulating Piston Valve

Safaei,

Dalla Vedova,

Maggiore

2024

J. Phys.: Conf. Ser.

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Due to their high reliability and precision, piston valves are frequently used for pressure regulating applications. Particularly in the aerospace industry, where cryogenic fluids such as liquid hydrogen are frequently used, the design and operation of piston valves become crucial. The current state of advancement of this technology in the cryogenic field is still in its early stages, owing to the difficulties in designing such complex systems in harsh environments. This justifies the need for further in-depth studies and analysis using CFDs tools and predictive models. In order to ensure an optimal and efficient use of a piston pressure regulating valve in cryogenic environment, it is necessary to understand the strengths and limitations of this technology in an extreme thermal and mechanical condition. The presented work concentrates therefore on a preliminary analysis and optimization of a piston valve operating in liquid hydrogen flow field, for pressure regulating applications. Particular focus will be dedicated to the overall dynamics of the main body of the piston, in terms of robustness and controllability of the desired response of the system. The dynamics of the piston within an extremely low-viscous flow, as well as the thermodynamic and fluid dynamic aspects of the valve system, will be discussed. Simulations of the flow field will be performed through CFD tool, crossing the results with the dynamics of the simulated system response through and implemented Simulink model. The obtained results will be then critically analysed in order to suggest possible optimization of the valve in the locations where the system is most affected from a thermal and mechanical standpoint.

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Section: Solver Settingmentioning

confidence: 99%

Preliminary Analysis and Optimization via CFD of a Liquid Hydrogen Pressure Regulating Piston Valve

Safaei,

Dalla Vedova,

Maggiore

2024

J. Phys.: Conf. Ser.

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“…To set up governing equations and boundary conditions for open water characteristics of the propeller, steady state simulation is used with rotating frame of reference. Governing Equations included RANS Equation with Reynolds averaging, which are expressed in [63] as;…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…This model utilizes the advantages of K-omega in the near wall and the effectiveness of K-epsilon in free stream in which standard K-omega gets overly sensitive. This model is similar to the standard K-epsilon model with few refinements, which make SST model more suitable for a wider class of flows, especially those that include adverse pressure gradient as in propeller case [63].…”

Section: Mathematical Modelingmentioning

confidence: 99%

Design Optimization of Marine Propeller using Elitist Particle Swarm Intelligence

Khan

Shoukat

Shah

et al. 2023

Preprint

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Marine transportation is still the primary source of global transportation. The propeller, which is a critical componentof the propulsion system, must be designed with multiple constraints and objectives to satisfy the need. Recent studies propose that utilizing an improved optimization algorithm and computational analysis would explore better designs than conventionalmethods. In the present study, Elitist Particle Swarm Optimization (EPSO) technique is implemented to optimize the design ofa marine propeller. Potsdam’s Conventional Propeller VP 1304 is used as a benchmark design case. Reynold’s Averaged NavierStokes equation based Computational Fluid Dynamics (CFD) along with Vortex Lattice Method (VLM) and Fluid StructureInteraction (FSI) model is used for computational analysis. The results obtained in this study are validated against the previously published experimental data. An optimized propeller design is proposed based on the Elitist Particle Swarm Optimization technique.It is observed that the proposed design shows improved open water performance for lower advance coefficient (J) valuesbased on the given constraints. It’s also observed that open water efficiency is improved by 7 percent for J=0.6 compared tothe original design. The one-way Fluid Structure Interaction analysis shows that the proposed design is structurally stable underopen water test conditions

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“…This approach allows the determination of the horizontal eddy viscosity through the Smagorinsky formulation, whereas the vertical eddy viscosity is obtained from the one-dimensional k-ε model. Despite some issues when dealing with strong anisotropic or curve flows, irrotational strains, stagnation flow, and near the boundary layers flow separation points, there are several advantages to using k-ε-based models [47][48][49]. The first one concerns the isotropic eddy viscosity, a simple concept.…”

Section: Introductionmentioning

confidence: 99%

Using Different Classic Turbulence Closure Models to Assess Salt and Temperature Modelling in a Lagunar System: A Sensitivity Study

Lopes

2022

JMSE

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Turbulence modelling is an important issue when dealing with hydrodynamic and transport models for better simulation of the transport of dissolved or suspended substances in a body-water. It controls processes involving physical balances (salt and water temperature) and, therefore, the ecosystem equilibrium. The study arises from the need to model the turbulence more efficiently when dealing with extreme situations on the Ria de Aveiro (Portugal), a coastal lagoon shallow water system dominated by tidal transport. Because the turbulence model is coupled to the hydrodynamic and transport models, a correct estimation of the eddy viscosity is important in simulating the salt and the heat transports. The aim is to assess the performance of four turbulence schemes/models (k, k-ε, Smagorinsky’s, and k-ε/Smagorinsky’s (k-ε/Sma), where k is turbulent kinetic energy and ε the dissipation rate of the turbulent kinetic energy) associated to a coupled hydrodynamic and transport models to simulate the eddy viscosity, the salinity, and the temperature. Overall, the results point out that among the different models/schemes used, the is the one which provides a more realistic value of the eddy viscosity within the range (1–6) m2 s−1, but most probably (1–3) m2 s−1. The application of the sensitivity analysis to some non-universal k-ε/Sma parameters evidenced significant sensitivity for the eddy viscosity and the salinity and moderate sensitivity for the water temperature. A 100% adjustment of the parameter values relative to the reference, translated into variations within the range of (1, 4) m2 s−1, (0, 13) PSU, and (1, 2.20) °C, for the eddy viscosity, salinity, and water temperature, respectively.

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Comparative Study of Different Turbulence Models for Cavitational Flows around NACA0012 Hydrofoil

Cited by 12 publications

References 22 publications

Preliminary Analysis and Optimization via CFD of a Liquid Hydrogen Pressure Regulating Piston Valve

Preliminary Analysis and Optimization via CFD of a Liquid Hydrogen Pressure Regulating Piston Valve

Design Optimization of Marine Propeller using Elitist Particle Swarm Intelligence

Using Different Classic Turbulence Closure Models to Assess Salt and Temperature Modelling in a Lagunar System: A Sensitivity Study

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