OJFD  Vol.2 No.3 , September 2012
CFD Simulations for Sensitivity Analysis of Different Parameters to the Wake Characteristics of Tidal Turbine
ABSTRACT
This paper investigates the sensitivity of width proximity and mesh grid size to the wake characteristics of Momentum Reversal Lift (MRL) turbine using a new computational fluid dynamics (CFD) based Immersed Body Force (IBF) model. This model has been added as a source term into the large eddy simulation (LES), which is developed for solving two phase fluids. The open source CFD code OpenFOAM was used for the simulations. The simulation results showed that the grid size and width proximity have had massive impact on the flow characteristics and the computational cost of the tidal turbine. A fine grid size and large width inflicted longer computational time. In contrast, a coarse grid size and small width reduced the computational time but showed poor description of the flow features. In addition, a close proximity of the domain’s wall boundary to the turbine affected the free surface, the air body, and the flow characteristics at the interface between the two phases. These results showed that careful investigation of a suitable grid size and spacing between the wall boundary and the turbine is important to minimise the effect of these parameters on the simulation results.

Cite this paper
M. Gebreslassie, G. Tabor and M. Belmont, "CFD Simulations for Sensitivity Analysis of Different Parameters to the Wake Characteristics of Tidal Turbine," Open Journal of Fluid Dynamics, Vol. 2 No. 3, 2012, pp. 56-64. doi: 10.4236/ojfd.2012.23006.
References
[1]   R. Bedard, M. Previsic, O. Siddiqui, G. Hagerman and M. Robinson, “Survey and Characterization Tidal in Stream Energy Conversion (Tisec) Devices,” EPRI Final Report, 2005.

[2]   G. Hagerman, B. Polagye, C. R. Bedard and M. Previsic, “Methodology for Estimating Tidal Current Energy Resources and Power Production by Tidal in-Stream Energy Conversion (TISEC) Devices,” 2006.

[3]   B. Andrew, “Phase II Tidal Stream Energy Assessment,” Technical Report, 2005.

[4]   S. Draper, G. T. Houlsby, M. L. G. Oldfield and A. G. L. Borthwick, “Modelling Tidal Energy Extraction in a Depthaveraged Coastal Domain,” Renewable Power Generation, Vol. 4, No. 6, 2010, pp. 545-554. Hdoi:10.1049/iet-rpg.2009.0196

[5]   M. E. Harrison, W. M. J. Batten, L. E. Myers and A. S. Bahaj, “Comparison between CFD Simulations and Experiments for Predicting the Far Wake of Horizontal Axis Tidal Turbines,” Renewable Power Generation, Vol. 4, No. 6, 2010, pp. 613-627. Hdoi:10.1049/iet-rpg.2009.0193

[6]   L. E. Myers and A. S. Bahaj, “Experimental Analysis of the Flow Field around Horizontal Axis Tidal Turbines by Use of Scale Mesh Disk Rotor Simulators,” Ocean Engineering, Vol. 37, No. 2-3, 2010, pp. 218-227. Hdoi:10.1016/j.oceaneng.2009.11.004

[7]   S. Gant and T. Stallard, “Modelling a Tidal Turbine in Unsteady Flow,” Proceedings of the Eighteenth International Offshore and Polar Engineering Conference, 2008, pp. 473-479.

[8]   X. Sun, J. P. Chick and I. G. Bryden, “Laboratory-Scale Simulation of Energy Extraction from Tidal Currents,” Renewable Energy, Vol. 33, No. 6, 2008, pp. 1267-1274. Hdoi:10.1016/j.renene.2007.06.018

[9]   M. G. Gebreslassie, G. R. Tabor and M. R. Belmont, “CFD Simulations for Investigating the Wake States of a New Class of Tidal Turbine,” Journal of Renewable Energy and Power Quality, Vol. 10, No. 241, 2012.

[10]   J. H. Ferziger and M. Peric, “Computational Methods for Fluid Dynamics,” Springer, Berlin, 1999.

[11]   http://www.openfoam.com/docs/user/

[12]   Z. Xie and I. P. Castro, “Les and Rans for Turbulent Flow over Arrays of Wall-Mounted Obstacles,” Flow, Turbulence and Combustion, Vol. 76, No. 3, 2006, pp. 291-312. Hdoi:10.1007/s10494-006-9018-6

[13]   A. Leonard, “Energy Cascade in Large-Eddy Simulations of Turbulent Fluid Flows,” Advances in Geophysics, Vol. 18, 1975, pp. 237-248.

[14]   A. Yoshizawa and K. Horiuti, “A Statistically-Derived Subgrid-Scale Kinetic Energy Model for the Large-Eddy Simulation of Turbulent Flows,” Journal of the Physical Society of Japan, Vol. 54, No. 8, 1985, pp. 2834-2839. Hdoi:10.1143/JPSJ.54.2834

[15]   C. Yang, R. Lohner and H. Lu, “An Unstructuredgrid Based Volume-of-Fluid Method for Extreme Wave and Freely-Floating Structure Interactions,” Journal of Hydrodynamics, Vol. 18, No. 3, 2006, pp. 415-422.

[16]   C. Yang, R. Lohner and S. C. Yim, “Development of a Cfd Simulation Method for Extreme Wave and Structure Interactions,” International Conference on Offshore Mechanics and Arctic Engineering (OMAE), Halkidiki, 2005.

[17]   G. Chen, C. Kharif, S. Zaleski and J. Li, “Two Dimensional Navier-Stokes Simulation of Breaking Waves,” Physics of Fluids, Vol. 11, No. 1, 1999, p. 121. Hdoi:10.1063/1.869907

[18]   X. He, S. Chen and R. Zhang, “A Lattice Boltzmann Scheme for Incompressible Multiphase Flow and Its Application in Simulation of Rayleigh-Taylor Instability,” Journal of Computational Physics, Vol. 152, No. 2, 1999, pp. 642-663. Hdoi:10.1006/jcph.1999.6257

[19]   C. W. Hirt and B. D. Nichols, “Volume of Fluid (VOF) Method for the Dynamics of Free Boundaries,” Journal of Computational Physics, Vol. 39, No. 1, 1981, pp. 201225. Hdoi:10.1016/0021-9991(81)90145-5

[20]   L. Gordon, “Mississippi River Discharge,” RD Instruments, San Diego, 1992.

[21]   S. Q. Yang, S. K. Tan and S. Y. Lim, “Velocity Distribution and Dip-Phenomenon in Smooth Uniform Open Channel Flows,” Journal of Hydraulic Engineering, Vol. 130, No. 12, 2004, p. 1179. Hdoi:10.1061/(ASCE)0733-9429(2004)130:12(1179)

[22]   M. H. Chaudhry, “Open-Channel Flow,” Springer Verlag, Berlin, 2008. Hdoi:10.1007/978-0-387-68648-6

[23]   C. L. Chiu and N. C. Tung, “Maximum Velocity and Regularities in Open-Channel Flow,” Journal of Hydraulic Engineering, Vol. 128, No. 4, 2002, pp. 390-399. Hdoi:10.1061/(ASCE)0733-9429(2002)128:4(390)

 
 
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