COMPARISON OF STANDARD k-epsilon AND SST k-omega TURBULENCE MODEL FOR BREASTSHOT WATERWHEEL SIMULATION
DOI:
https://doi.org/10.36706/jmse.v7i2.44Keywords:
Picohydro, Breastshot, Waterwheel, Computational, Turbulent ModelAbstract
Currently, Computational Fluid Dynamics (CFD) was utilized to predict the performance, geometry optimization or physical phenomena of a breastshot waterwheel. The CFD method requires the turbulent model to predict the turbulent flow. However, until now there is special attention on the effective turbulent model used in the analysis of breastshot waterwheel. This study is to identify the suitable turbulence model for a breatshot waterwheel. The two turbulence models investigated are: standard k-epsilon model and shear stress transport (SST) k-omega. Pressure based and one degrees of freedom (one-DoF) feature was used in this case with 75 Nm, 150 Nm, 225 Nm and 300 Nm as preloads. Based on the results, the standard k-epsilon model gave similar result with the SST k-omega model. Therefore, the simulation for breastshot waterwheel will be efficient if using the standard k-epsilon model because it requires lower computational power than the SST k-omega model. However, to study about physical phenomenon, the SST k-omega model is recommend.
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References
Warjito, D. Adanta, Budiarso, and A. P. Prakoso, “The Effect of Bucket Number on Breastshot Waterwheel Performance,” in IOP Conference Series: Earth and Environmental Science, 2018, p. 12031.
B. Ho-Yan, “Design of a Low Head Pico Hydro Turbine for Rural Electrification in Cameroon,” University of Guelph, 2012.
D. Adanta, Budiarso, Warjito, and A. I. Siswantara, “Assessment of Turbulence Modelling for Numerical Simulations into Pico Hydro Turbine,” Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, vol. 45, pp. 21–31, 2018.
P. Adhikari, U. Budhathoki, S. R. Timilsina, S. Manandhar, and T. R. Bajracharya, “A Study on Developing Pico Propeller Turbine for Low Head Micro Hydropower Plants in Nepal,” Journal of the Institute of Engineering, vol. 9, no. 1, pp. 36–53, 2014.
S. J. Williamson, B. H. Stark, and J. D. Booker, “Low Head Pico Hydro Turbine Selection Using a Multi-Criteria Analysis,” Renewable Energy, vol. 61, pp. 43–50, 2014, doi: 10.1016/j.renene.2012.06.020.
G. Muller and C. Wolter, “The Breastshot Waterwheel: Design and Model Tests,” ICE Proceedings-Engineering Sustainability, pp. 203–211, 2004.
M. Gotoh, H. Kowata, T. Okuyama, and S. Katayama, “Damming-up Effect of a Current Water Wheel Set in a Rectangular Channel,” World Renewable Energy Congress VI, pp. 1615–1618, Jan. 2000, doi: 10.1016/B978-008043865-8/50333-0.
E. Quaranta and R. Revelli, “Optimization of Breastshot Water Wheels Performance Using Different Inflow Configurations,” Renewable Energy, vol. 97, pp. 243–251, 2016, doi: 10.1016/j.renene.2016.05.078.
E. Quaranta and R. Revelli, “Performance Characteristics, Power Losses and Mechanical Power Estimation for a Breastshot Water Wheel,” Energy, vol. 87, pp. 315–325, 2015, doi: http://dx.doi.org/10.1016/j.energy.2015.04.079.
E. Quaranta and R. Revelli, “CFD Simulations to Optimize the Blades Design of Water Wheels,” Drinking Water Engineering and Science Discussions, pp. 1–8, Jan. 2017, doi: 10.5194/dwes-2017-2.
E. Quaranta and R. Revelli, “Hydraulic Behavior and Performance of Breastshot Water Wheels for Different Numbers of Blades,” Journal of Hydraulic Engineering, vol. 143, no. 1, p. 4016072, 2016.
Warjito, D. Adanta, Budiarso, and A. P. Prakoso, “The Effect of Bucketnumber on Breastshot Waterwheel Performance,” in IOP Conference Series: Earth and Environmental Science, 2018, vol. 105, no. 1, p. 12031.
Budiarso, Warjito, J. S. PPS, A. P. Prakoso, and D. Adanta, “Influence of Bucket Shape and Kinetic Energy on Breastshot Waterwheel Performance,” in 2018 4th International Conference on Science and Technology (ICST), 2018, pp. 1–6.
T. Saad, “Turbulence Modeling for Beginners,” University of Tennessee space institute, 2011.
H. Tennekes and J. L. Lumley, A first course in turbulence. MIT press, 1972.
L. Davidson, Fluid mechanics, turbulent flow and turbulence modeling. Chalmes University of Technology, 2015.
B. E. Launder and D. B. Spalding, “The Numerical Computation of Turbulent Flows,” Computer Methods in Applied Mechanics and Engineering, vol. 3, no. 2, pp. 269–289, 1974, doi: 10.1016/0045-7825(74)90029-2.
ANSYS, “Turbulence,” in ANSYS FLUENT 12.0 Teory Guide, 2009, pp. 2-1-4–46.
F. R. Menter, “Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications,” AIAA journal, vol. 32, no. 8, pp. 1598–1605, 1994.
F. R. Menter, “Improved Two-Equation k-Omega Turbulence Models for Aerodynamic Flows,” 1992.
