CFD Investigation of Performance for Marine Current Turbine Based on RANS Simulations

2009 ◽  
Vol 419-420 ◽  
pp. 309-312 ◽  
Author(s):  
Rui Jun Fan ◽  
J.R. Chaplin ◽  
Guang Jun Yang
Keyword(s):  
Pitch Angle ◽  
Compressible Flows ◽  
Structured Grids ◽  
Numerical Predictions ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Simulation Results ◽  
Volume Method ◽  
Current Turbine ◽  
Blade Pitch Angle

This paper presents the 3D CFD computation of an 800mm diameter model of MCT based on structured grids, RANS equations and turbulence model. A time-accurate, upwind, finite volume method for computing compressible flows on structured grids is presented. Numerical predictions for a series of blade pitch angle settings and speeds are compared with the other simulation results of commercial software, verified by the experimental measurement of the model. Such results provide confidence in using the CFD computation tools to develop the forthcoming design of MCT.

Design and Analysis of a Marine Current Turbine

2017 ◽  
Author(s):  
T. Karthikeyan ◽  
E. J. Avital ◽  
N. Venkatesan ◽  
A. Samad
Keyword(s):  
Pitch Angle ◽  
Flow Simulation ◽  
Ocean Current ◽  
Power Coefficient ◽  
Design Parameters ◽  
Marine Current Turbine ◽  
Commercial Code ◽  
Marine Current ◽  
Current Turbine ◽  
Blade Pitch Angle

Ocean stores a huge amount of energy and ocean current energy can be a viable source in future. In this article, an axial marine current turbine has been optimized to enhance its power coefficient through numerical modeling. The blade pitch-angle and number of blades are the design parameters chosen for the analysis to find the optimal design. A commercial code for CFD simulations with in-house optimization code was used for the analysis. It was found that, changing the blade pitch-angle and reducing the number of blades can improve the turbine’s coefficient of power. This is due to increase in lift and reduction of losses caused by turbulence near the downstream of the turbine. The article presents flow-simulation difficulties and characteristic curves to identify the differences between the actual and optimized turbine. The detailed flow physics is discussed and pictured in the post processed plots.

Numerical Simulations in the Design of a New Tension-Tethered Marine Current Turbine

2014 ◽  
Author(s):  
David Fernandez ◽  
Jaime Moreu ◽  
Santiago de Guzman ◽  
Ronald W. Yeung ◽  
Manuel Moreu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Test Model ◽  
Pressure Distributions ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Computational Fluid Dynamics Cfd ◽  
Marine Currents ◽  
Simulation Results ◽  
Current Turbine

This paper focuses on the applicability of different Computational Fluid Dynamics (CFD) software for the design of marine current turbines. As part of the conceptual design process, Seaplace has carried out a detailed numerical and experimental hydrodynamic program to optimize a new Tension-Tethered Turbine concept for harnessing energy from marine currents. Three different codes have been assessed, based on the demands from each phase: OpenProp, TurbProp, and ANSYS® CFX®. The paper provides an extensive summary of the main outcomes from the turbine optimization process to achieve highest efficiencies. A description of the tested geometries and the implementation of TurbProp to account for inline turbine solutions is included. Simulations for the test-model and prototype scales have been performed, with the pressure distributions, flow streamlines and power coefficients presented as primary results. The influence of simulation results on the final turbine configurations is discussed.

Numerical Predictions and Experimental Verifications for the Hydrodynamic Performance of Horizontal Axis Marine Current Turbine

2013 ◽  
Vol 694-697 ◽  
pp. 635-638
Author(s):  
Rui Jun Fan ◽  
Hong Chao Gao ◽  
J. R. Chaplin
Keyword(s):  
Hydrodynamic Performance ◽  
Experimental Measurements ◽  
Hydrodynamic Conditions ◽  
Towing Tank ◽  
Numerical Predictions ◽  
Turbine Performance ◽  
Marine Current Turbine ◽  
Cavitation Tunnel ◽  
Marine Current ◽  
Current Turbine

This paper presents the numerical predictions of 3D CFD rotor computations of an 800mm diameter model of marine current turbine (MCT). In the paper CFD is applied to a rotor at stationary hydrodynamic conditions Simulations from the numerical prediction are compared with experimental measurements of the model of MCT which is experimented on in a cavitation tunnel and a towing tank. The experimental data includes measurements of power and thrust generated by the turbine, in both a cavitation tunnel and a towing tank, for a series of blade pitch settings and speeds. The numerical predictions show similar results and provide a satisfactory representation of the experimental turbine performance.

scholarly journals A Fuzzy Adaptative Backstepping Control Strategy for Marine Current Turbine under Disturbances and Uncertainties

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6550
Author(s):  
Xusheng Shen ◽  
Tao Xie ◽  
Tianzhen Wang
Keyword(s):  
Backstepping Control ◽  
Pi Control ◽  
Adaptive Backstepping ◽  
Adaptive Backstepping Control ◽  
Control Approach ◽  
Power Extraction ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Simulation Results ◽  
Current Turbine

Marine current energy is attracting more and more attention in the world as a reliable and highly predictable energy resource. However, conventional proportional integral (PI) control will be sensitive to the numerous challenges that exist in a marine current turbine system (MCTs) such as marine current disturbance, torque disturbance and other uncertain parameters. This paper proposes a fuzzy adaptive backstepping control (F-A-BC) approach for a marine current turbine system. The proposed F-A-BC strategy consisted of two parts. First, an adaptive backstepping control approach with the compensation of disturbance and uncertainty was designed to improve anti-interference of the MCT so that the maximum power point tracking (MPPT) was realized. Then, a fuzzy logic control approach was combined to adjust parameters of an adaptive backstepping control approach in real time. The effectiveness of the proposed controller was verified by the simulation of a direct-drive marine current turbine system. The simulation results showed that the F-A-BC has better anti-interference ability and faster convergence compared to the adaptive backstepping control, sliding mode control and fuzzy PI control strategies under disturbances. The error percentage of rotor speed could be reduced by 3.5% under swell effect compared to the conventional controller. Moreover, the robustness of the F-A-BC method under uncertainties was tested and analyzed. The simulation results also indicated that the proposed approach could slightly improve the power extraction capability of the MCTs under variable marine current speed.

Design optimization of a marine current turbine having winglet on blade

2021 ◽  
Vol 239 ◽  
pp. 109877
Author(s):  
Murali Kunasekaran ◽  
Shin Hyung Rhee ◽  
Nithya Venkatesan ◽  
Abdus Samad
Keyword(s):  
Design Optimization ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Current Turbine

Modeling of Aluminum Extrusion Process Using Non-Orthogonal Block Structured Grids Based FVM

2011 ◽  
Vol 189-193 ◽  
pp. 1749-1752
Author(s):  
Rui Wang ◽  
Hong Zhong Li
Keyword(s):  
Mathematic Model ◽  
Extrusion Process ◽  
Special Treatment ◽  
Aluminum Extrusion ◽  
Rigid Plastic ◽  
Structured Grids ◽  
Simulation Results ◽  
Flow Theories ◽  
Volume Method ◽  
Die Extrusion

The mathematic model of 3D aluminum extrusion processes using finite volume method (FVM) was established in this paper. The basic theories and rigid-plastic flow theories of this model were researched and built. Non-orthogonal structured grids were used to match complex geometric boundaries and local refinement of grids was also realized. The collocated arrangement is used to discretize the governing equations on non-orthogonal grids directly, pressure oscillations bring by this arrangement and error caused by grid’s non-orthogonality is eliminated by special treatment. A pocket die extrusion process was simulated using the program developed in this paper. The simulation results were also compared with that simulated by FEM software Deform in the same process, material and die conditions. The feasibility and efficiency of the mathematic model built in this paper was demonstrated by the simulation results and the comparison.

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