scholarly journals Accuracy Improvement in One-day Ahead Wind Power Output Prediction by Computational Fluid Dynamics Calculation

2012 ◽  
pp. 317-321
Author(s):  
T. Kumano
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Power ◽  
Power Output ◽  
Accuracy Improvement ◽  
Dynamics Calculation

scholarly journals Computational fluid dynamics modeling of the millisecond methane steam reforming in microchannel reactors for hydrogen production

RSC Advances ◽  
2018 ◽  
Vol 8 (44) ◽  
pp. 25183-25200 ◽  
Author(s):  
Junjie Chen ◽  
Xuhui Gao ◽  
Longfei Yan ◽  
Deguang Xu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Hydrogen Production ◽  
Steam Reforming ◽  
Power Output ◽  
Methane Steam Reforming ◽  
Dynamics Modeling ◽  
Computational Fluid Dynamics Modeling ◽  
Microchannel Reactors ◽  
Methane Steam

The potential of methane steam reforming to produce hydrogen at short contact times was explored. Operating windows were identified, and engineering maps were constructed to achieve the desired power output.

scholarly journals Computational Fluid Dynamics calculation of a planar solid oxide fuel cell design running on syngas

2017 ◽  
Vol 38 (4) ◽  
pp. 513-521
Author(s):  
Paulina Pianko-Oprych ◽  
Tomasz Zinko ◽  
Zdzisław Jaworski
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Gas Flow ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ansys Fluent ◽  
Dynamics Calculation ◽  
Shift Reaction

Abstract The present study deals with modelling and validation of a planar Solid Oxide Fuel Cell (SOFC) design fuelled by gas mixture of partially pre-reformed methane. A 3D model was developed using the ANSYS Fluent Computational Fluid Dynamics (CFD) tool that was supported by an additional Fuel Cell Tools module. The governing equations for momentum, heat, gas species, ion and electron transport were implemented and coupled to kinetics describing the electrochemical and reforming reactions. In the model, the Water Gas Shift reaction in a porous anode layer was included. Electrochemical oxidation of hydrogen and carbon monoxide fuels were both considered. The developed model enabled to predict the distributions of temperature, current density and gas flow in the fuel cell.

scholarly journals Wind Energy Prediction in Highly Complex Terrain by Computational Fluid Dynamics

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1311 ◽  
Author(s):  
Daniel Tabas ◽  
Jiannong Fang ◽  
Fernando Porté-Agel
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Power ◽  
Complex Terrain ◽  
Wind Farm ◽  
Turbulence Models ◽  
Domain Size ◽  
Electricity Production ◽  
Power Prediction ◽  
Energy Prediction

With rising levels of wind power penetration in global electricity production, the relevance of wind power prediction is growing. More accurate forecasts reduce the required total amount of energy reserve capacity needed to ensure grid reliability and the risk of penalty for wind farm operators. This study analyzes the Computational Fluid Dynamics (CFD) software WindSim regarding its ability to perform accurate wind power predictions in complex terrain. Simulations of the wind field and wind farm power output in the Swiss Jura Mountains at the location of the Juvent Wind Farm during winter were performed. The study site features the combined presence of three complexities: topography, heterogeneous vegetation including forest, and interactions between wind turbine wakes. Hence, it allows a comprehensive evaluation of the software. Various turbulence models, forest models, and wake models, as well as the effects of domain size and grid resolution were evaluated against wind and power observations from nine Vestas V90’s 2.0-MW turbines. The results show that, with a proper combination of modeling options, WindSim is able to predict the performance of the wind farm with sufficient accuracy.

scholarly journals Numerical optimisation of a micro-wave rotor turbine using a quasi-two-dimensional CFD model and a hybrid algorithm

Shock Waves ◽  
2021 ◽  
Author(s):  
S. Tüchler ◽  
C. D. Copeland
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Power Output ◽  
Wide Spectrum ◽  
Pressure Ratio ◽  
Hybrid Genetic Algorithm ◽  
Shape Optimisation ◽  
Two Dimensional ◽  
Wave Rotor ◽  
Shaft Power

AbstractWave rotors are unsteady flow machines that exchange energy through pressure waves. This has the potential for enhancing efficiency over a wide spectrum of applications, ranging from gas turbine topping cycles to pressure-gain combustors. This paper introduces an aerodynamic shape optimisation of a power generating non-axial micro-wave rotor turbine and seeks to enhance the shaft power output while preserving the wave rotor’s capacity to function as a pressure-exchanging device. The optimisation considers six parameters including rotor shape profile, wall thickness, and number of channels and is done using a hybrid genetic algorithm that couples an evolutionary algorithm with a surrogate model. The underlying numerical model is based on a transient, reduced-order, quasi-two dimensional computational fluid dynamics model at a fixed operating condition. The numerical results from the quasi-two-dimensional optimisation indicate that the best candidate design increases shaft power by a factor of 1.78 and imply a trade-off relationship between torque generation and pressure exchange capabilities. Further evaluation of the optimised design using three-dimensional computational fluid dynamics simulations confirms the increase in power output at the cost of increased entropy production. It is further disclosed that increased incidence losses during the initial opening of the channel to the high-pressure inlet duct compromise the shock strength of the primary shock wave and account for the decrease in pressure ratio. Finally, the numerical trends are validated using experimental data.

Observation on sloshing flow and hydrodynamic pressures on cylindrical liquefied natural gas tank with swash bulkhead

2020 ◽  
pp. 147509022095999
Author(s):  
Jeoungkyu Lee ◽  
Yangjun Ahn ◽  
Jieung Kim ◽  
Yonghwan Kim ◽  
Kyung-Kyu Yang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Resonance Frequency ◽  
Frequency Ratio ◽  
Internal Flow ◽  
Liquefied Natural Gas ◽  
Frequency Range ◽  
Type C ◽  
Dynamics Calculation ◽  
The Impact

In this study, a series of sloshing model tests were conducted for type-C tanks, particularly to observe the effects of the inner bulkhead and rings. In regular pitch motion, the internal flow by swash bulkhead and rings located inside the tank was observed. The frequency range near the resonance frequency was checked at filling heights of 70%, and sloshing-induced impact pressures were investigated. Through this study, the global flows inside the tank and local flows during impact occurrence at the hemispherical end of the tank were systematically observed, and the impact pressure pattern for each frequency ratio was compared. Due to the swash bulkhead located in the center of the tank, the flow does not move at once and the velocity of the flow is reduced by the inner rings. The flows passing through the swash bulkhead proceed with a time difference, overlapping with the first wave, generating various types of sloshing impact. The results of computational fluid dynamics calculation and the experiment were also compared for limited conditions.

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