Novel Design of Vertical Axis Current Turbine for Low Current Speed via Finite Volume Method

2015 ◽  
Vol 74 (5) ◽  
Author(s):  
Fatemeh Behrouzi ◽  
Adi Maimun ◽  
Yasser M. Ahmed ◽  
Mehdi Nakisa
Keyword(s):  
Experimental Data ◽  
Energy Demand ◽  
Fossil Fuel ◽  
Vertical Axis ◽  
Computational Fluid Dynamics Cfd ◽  
Volume Method ◽  
Current Turbine ◽  
Novel Design ◽  
Static Torque ◽  
Good Agreement

Now a day, increasing energy demand and environmental effect of fossil fuel cause to replacing fossil fuel with renewable energy. This paper presented novel design of turbine to generate more torque to capture more energy of water and hence cause to high output power. In this work Computational Fluid Dynamics (CFD) using realize k-e turbulence model, have been used to analyses the effect of arm on the static torque and the contours of pressure in different angle of direction for vertical vane turbine. Investigation of arm effect on static torque of vertical vane turbine and comparison between turbine with arm and without arm showed the average torque in vertical vane turbine is higher than without arm. The model settings of validation study was accomplished by comparing simulation of performance of turbine Cp and Cm with the experimental data taken from Hayashi and Hara (2005),that showed realize k-e has good agreement with experimental data.

Numerical Simulations of Ground Simulation for a Realistic Generic Car Model

2014 ◽  
Author(s):  
E. Guilmineau
Keyword(s):  
Experimental Data ◽  
Major Change ◽  
Front Wheel ◽  
Flow Solver ◽  
Vortical Structures ◽  
Car Model ◽  
Computational Fluid Dynamics Cfd ◽  
Drag And Lift ◽  
Volume Method ◽  
Good Agreement

Investigations of the aerodynamic influence of rotating wheels and moving ground on a realistic generic car model are presented. For this study, Computational Fluid Dynamics (CFD) are carried out with the flow solver ISIS-CFD, which is based on a finite-volume method. This paper presents the effects of ground simulation (GS) for the realistic car model DrivAer. Comparisons of the pressure between experimental data and numerical results show a good agreement. A moving ground and rotating wheels reduces the drag and the lift. Though the forces decreases at the front wheel due to the wheel rotation locally, the major change in drag and lift happens directly on the car body itself. The main vortical structures that develop around the wheels are also presented.

Analysis and Numerical Simulation of no Reacting Swirling Flow by Using URANS Approach

2021 ◽  
Vol 57 ◽  
pp. 67-79
Author(s):  
Merouane Habib ◽  
Senouci Mohammed
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Swirling Flow ◽  
Navier Stokes ◽  
Governing Equations ◽  
Simulation Based ◽  
Classical Models ◽  
Recirculation Zones ◽  
Computational Fluid Dynamics Cfd ◽  
Volume Method

In this paper, we investigate the no-reacting swirling flow by using the numerical simulation based to the unsteady Reynolds-averaged Navier-Stokes approach. The numerical simulation was realized by using a computational fluid dynamics CFD code. The governing equations are solved by using the finite volume method with two classical models of turbulence K-epsilon and Shear Stress K-ω. The objective of this paper is therefore to evaluate the performance of the two models in predicting the recirculation zones in a swirled turbulent flow. The current models are validated by comparing the numerical results of the axial, radial and tangential velocities to the experimental data from literature.

A Duct Optimization Study for a Vertical Axis Hydro-current Turbine Model

2011 ◽  
Vol 134 (2) ◽  
Author(s):  
M. Alidadi ◽  
V. Klaptocz ◽  
G. W. Rawlings ◽  
Y. Nabavi ◽  
S. Calisal
Keyword(s):  
Power Output ◽  
Numerical Optimization ◽  
Vertical Axis ◽  
Experimental Results ◽  
Maximum Power Output ◽  
Numerical Predictions ◽  
Optimization Study ◽  
Current Turbine ◽  
Turbine Model ◽  
Good Agreement

A numerical optimization study is used to design a duct for a model of vertical axis hydro-current turbine. The effects of this duct on the power output and torque fluctuations of the turbine model are then examined numerically and experimentally. Relatively good agreement was obtained between the experimental results and numerical predictions especially at higher tip speed ratios. Experimental results show an 85% increase in the maximum power output when the turbine is placed inside the duct. The numerical and experimental torque curves for the turbine also show substantial reductions in the torque fluctuations as a result of ducting.

Study of Civil-Plane High-Lift Model Using Omni-Tree Cartesian Grids

2012 ◽  
Vol 249-250 ◽  
pp. 1019-1024
Author(s):  
Chao Xi ◽  
Wei Min Sang
Keyword(s):  
Experimental Data ◽  
Numerical Method ◽  
Finite Volume Method ◽  
Cartesian Grid ◽  
High Lift ◽  
Face To Face ◽  
Time Stepping ◽  
Dual Time Stepping ◽  
Volume Method ◽  
Good Agreement

We developed a CFD code applies the omni-tree Cartesian grid to simulate the flow fields around one civil-plane high-lift model using the multi-zone technique. With a face-to-face algorithm, the flow control equations are solved numerically, in combination with the cell-center finite volume method and dual-time stepping scheme. The computed results are in good agreement with the experimental data and show preliminarily that numerical method is effective.

Arm Effect on Performance of Vertical Axis Current Turbine Using RANS Simulation

2014 ◽  
Vol 554 ◽  
pp. 531-535
Author(s):  
Fatemeh Behrouzi ◽  
Adi Maimun Abdul Malik ◽  
Mehdi Nakisa ◽  
Yasser Mohamed Ahmed
Keyword(s):  
Electricity Generation ◽  
Fossil Fuel ◽  
Vertical Axis ◽  
Water Current ◽  
Small Scale ◽  
Hydro Power ◽  
Renewable Energy Technologies ◽  
Fuel Prices ◽  
Energy Technologies ◽  
Current Turbine

Climate changing, electrical demands, rising diesel fuel prices, as well as fossil fuel-based energy is limited and in fact is depleting ,are subjects to use of renewable technologies. Among the different renewable energy technologies, hydro power generation (large and small scale) is the prime choice in terms of contribution to the world's electricity generation by using water current turbines.CFD simulation using two equations turbulence model was carried out to compare performance of conventional savonius turnine and new consept of vertical axis turbine. This study was coducted to reach suitable desigh of vertical axis turbines for capturing more kineticenergy of current via of others esspecially,low current speed.

Model Testing and CFD Analysis of 2D Profiles Towards Offshore Applications

2013 ◽  
Author(s):  
Lucas do Vale Machado ◽  
Antonio Carlos Fernandes ◽  
Gustavo César Rachid Bodstein
Keyword(s):  
Experimental Data ◽  
Experimental Measurements ◽  
Cfd Analysis ◽  
Two Dimensional ◽  
Reference Simulation ◽  
Sst Turbulence Model ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
Naca 0015 ◽  
Good Agreement

In this paper we present numerical and experimental work motivated by the study of a rudder profile with significant levels of lift that provides better performance for the maneuvering and stabilization of a ship. This is the so-called Schilling profile. The analysis of the two-dimensional subsonic steady flow over four profiles was carried out using computational fluid dynamics (CFD) tools with a κ-ω SST turbulence model. We consider three Schilling profiles with different thicknesses and the classical NACA 0015 profile, taken as a reference. Simulation results were compared to our experimental measurements at various angles of attack and two orders of magnitude of the Reynolds number, 5.45 × 104 and 1.09 × 105. The numerical results show general good agreement with experimental data and highlight the distinct behavior of Schilling profile.

Aerodynamic Simulation of Vertical-Axis Wind Turbines

2013 ◽  
Vol 81 (2) ◽  
Author(s):  
A. Korobenko ◽  
M.-C. Hsu ◽  
I. Akkerman ◽  
Y. Bazilevs
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Vertical Axis ◽  
Time Dependent ◽  
Computational Results ◽  
Vertical Axis Wind Turbine ◽  
Vertical Axis Wind Turbines ◽  
Moving Domain ◽  
Aerodynamic Simulation ◽  
Good Agreement

Full-scale, 3D, time-dependent aerodynamics modeling and simulation of a Darrieus-type vertical-axis wind turbine (VAWT) is presented. The simulations are performed using a moving-domain finite-element-based ALE-VMS technique augmented with a sliding-interface formulation to handle the rotor-stator interactions present. We simulate a single VAWT using a sequence of meshes with increased resolution to assess the computational requirements for this class of problems. The computational results are in good agreement with experimental data. We also perform a computation of two side-by-side counterrotating VAWTs to illustrate how the ALE-VMS technique may be used for the simulation of multiple turbines placed in arrays.

Influence of Jordanian zeolite on the performance of a solar still: experiments and CFD simulation studies

2016 ◽  
Vol 16 (6) ◽  
pp. 1700-1709 ◽  
Author(s):  
Yazan Taamneh
Keyword(s):  
Experimental Data ◽  
Phase Change ◽  
Cfd Simulation ◽  
Volume Fraction ◽  
Solar Still ◽  
Cfd Simulations ◽  
Two Phase ◽  
Vof Model ◽  
Computational Fluid Dynamics Cfd ◽  
Good Agreement

Computational fluid dynamics (CFD) simulations were performed for experiments carried out with two identical pyramid-shaped solar stills. One was filled with Jordanian zeolite-seawater and the second was filled with seawater only. This work is focused on CFD analysis validation with experimental data conducted using a model of phase change interaction (evaporation-condensation model) inside the solar still. A volume-of-fluid (VOF) model was used to simulate the inter phase change through evaporation-condensation between zeolite-water and water vapor inside the two solar stills. The effect of the volume fraction of the zeolite particles (0 ≤ ϕ ≤ 0.05) on the heat and distillate yield inside the solar still was investigated. Based on the CFD simulation results, the hourly quantity of freshwater showed a good agreement with the corresponding experimental data. The present study has established the utility of using the VOF two phase flow model to provide a reasonable solution to the complicated inter phase mass transfer in a solar still.

scholarly journals Numerical Study of Turbulent Secondary Flows in Curved Ducts

1990 ◽  
Vol 112 (2) ◽  
pp. 205-211 ◽  
Author(s):  
N. Hur ◽  
S. Thangam ◽  
C. G. Speziale
Keyword(s):  
Experimental Data ◽  
Turbulent Flow ◽  
Secondary Flow ◽  
Cross Section ◽  
Numerical Study ◽  
Secondary Flows ◽  
Fully Developed Turbulent Flow ◽  
Volume Method ◽  
Curved Ducts ◽  
Good Agreement

The pressure driven, fully developed turbulent flow of an incompressible viscous fluid in curved ducts of square cross-section is studied numerically by making use of a finite volume method. A nonlinear K -1 model is used to represent the turbulence. The results for both straight and curved ducts are presented. For the case of fully developed turbulent flow in straight ducts, the secondary flow is characterized by an eight-vortex structure for which the computed flowfield is shown to be in good agreement with available experimental data. The introduction of moderate curvature is shown to cause a substantial increase in the strength of the secondary flow and to change the secondary flow pattern to either a double-vortex or a four-vortex configuration.

CFD Study of Tidal Current Turbine Shroud for Initial Design Evaluation

2014 ◽  
Vol 679 ◽  
pp. 35-38 ◽  
Author(s):  
Azim Arshad ◽  
Shahrani Anuar ◽  
Ahmmad Shukrie ◽  
Rosdi Hussin
Keyword(s):  
Experimental Data ◽  
Tidal Current ◽  
Cfd Simulation ◽  
Ansys Fluent ◽  
Commercial Code ◽  
Simulation And Experiment ◽  
Tidal Current Turbine ◽  
Coefficient Of Velocity ◽  
Current Turbine ◽  
Good Agreement

CFD simulation of a tidal current turbine shroud was performed using Ansys FLUENT commercial code and comparison was made with experimental data. The simulation result obtained was in good agreement with the experimental data. The coefficient of velocity, Cv was in the range of approximately 1.2 to 1.4 for both simulation and experiment. The present study gave useful information on the viability of CFD simulation for the initial evaluation of shroud design performance.

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