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Adanta, Dendy
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Sriwijaya, Ogan Ilir, Sumatera Selatan, Indonesia
Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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Journal : Journal of Mechanical Science and Engineering

 1 
COMPARISON OF CFD SIMULATION WITH 3 TURBULENCE MODELS FOR BREASTSHOT PICO HYDRO TURBINE Dendy Adanta
Journal of Mechanical Science and Engineering Vol 7, No 2 (2020): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

The breastshot waterwheels are suitable for low head condition because it offers a stable efficiency compared to other types of turbine. In some cases, computational fluid dynamics (CFD) was utilized to predict the performance, geometry optimization or physical phenomena of a breastshot waterwheel, CFD offers easiness in terms of energy, time and cost than doing experimental test. Turbulence modeling is a mathematical method to approach the evolution of turbulence. The aim of this study is to identify the suitable turbulence model for a breatshot waterwheel. These three turbulence models were utilized: k-? standard, k-? scalable near wall function and SST k-?. The braking preloads in simulation was varied, which were 75 N m, 150 Nm, 225 N m and 300 N m. Based on grid convergence index (GCI), the 123k elements of mesh and timestep size of 0.002 s were used and when compared to the exact value, an error below 2% was found. Moreover, the k-? scalable near wall function model and the turbulent SST k-? model give the similar result in torque. Therefore, the simulation test to find torque will be more efficient if using the standard k-? turbulent model because it has computational time which is lower than the turbulent SST k-? model. For the eddy viscosity and turbulence intensity contour k-? standard turbulent model and k-? near wall scalable gives no significant differences, but SST k-? model doe. The simulation test to find eddy viscosity and turbulence intensity contour will be more accurate if using SST k-? model, because this model has the mean rate-of-rotation tensor function, ? , and the blending functions, that makes SST k-? model have better accuracy on the near wall calculation.
Co-Authors Abd. Rasyid Syamsuri ahmad burhan Ahmad Irham Jambak AKBAR TEGUH PRAKOSO Akbar Teguh Prakoso Akbar Teguh Prakoso Amir Arifin Amir Arifin Astuti Astuti Barlin Barlin Barlin Oemar Budiarso Budiarso, Budiarso Dewi Puspita Sari Dewi Puspita Sari Dewi Puspita Sari Dewi Puspita Sari Dewi Puspita Sari Efri Meldianto ELLYANIE ELLYANIE Farhan Yadi Farhan Yadi Gunawan Gunawan Gunawan Gunawan Gunawan Gunawan GUSTINI GUSTINI Hardika Widi Satria HASAN BASRI Hendri Chandra Ihsan Asura Imam Syofi'i Imam Syofii Imam Syofii Imam Syofii Irsyadi Yani Ismail Thamrin krypton, arius M. A. Ade Saputra M. A. Ade Saputra M. A. Ade Saputra m. amri MARWANI MARWANI Mochamad Amri Santosa Mochamad Amri Santosa Muhammad Amsal Ade Saputra MUHAMMAD YANIS Naldo Naldo Naldo, Naldo Nura Muaz Muhammad Prakoso, Aji Putro Rudi Hermawan Satria, Hardika Wadirin Wadirin Wadirin Wadirin warjito warjito ZAINAL ABIDIN Zulkarnain Ali Leman ZULKARNAIN ZULKARNAIN