Analisis Numerik Pengaruh Posisi Blade Yang Berdekatan Pada Turbin Angin Savonius Konfigurasi Tandem Di Samping Gedung Dengan Variasi Kecepatan Angin 3 - 5 m/s

Ridho, Mohammad Hikmatul (2026) Analisis Numerik Pengaruh Posisi Blade Yang Berdekatan Pada Turbin Angin Savonius Konfigurasi Tandem Di Samping Gedung Dengan Variasi Kecepatan Angin 3 - 5 m/s. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia memiliki potensi energi angin yang besar, namun sebagian besar wilayahnya memiliki kecepatan angin relatif rendah (3–6 m/s), sehingga diperlukan turbin yang mampu beroperasi secara optimal pada kondisi tersebut. Turbin Savonius merupakan salah satu jenis Vertical Axis Wind Turbine (VAWT) yang sesuai untuk kondisi angin rendah, tetapi memiliki efisiensi yang rendah akibat gaya hambat pada returning blade. Salah satu upaya peningkatan performa dilakukan melalui konsep Building-Augmented Wind Turbine (BAWT) dengan konfigurasi tandem. Namun, pengaruh posisi blade yang berdekatan (adjacent blade position) pada konfigurasi tersebut masih belum banyak dikaji. Oleh karena itu, penelitian ini bertujuan menganalisis secara numerik pengaruh posisi blade yang berdekatan terhadap karakteristik aerodinamika dan performa turbin Savonius konfigurasi tandem di samping gedung pada kecepatan angin 3–5 m/s. Penelitian ini menggunakan metode Computational Fluid Dynamics (CFD) dengan ANSYS Fluent 2024 R2 menggunakan solver 2D Planar, PressureBased, Transient, metode Dynamic Mesh, dan model turbulensi Realizable k-ε dengan Enhanced Wall Treatment. Model numerik divalidasi menggunakan data eksperimen Sakti et al. (2021) dengan galat relatif kurang dari 1%, serta uji independensi mesh menggunakan 112.179 elemen dengan galat 2,6%. Simulasi dilakukan pada tiga konfigurasi posisi blade dan variasi kecepatan angin 3, 4, dan 5 m/s. Analisis meliputi distribusi kecepatan, distribusi tekanan, pressure coefficient, intensitas turbulensi, karakteristik wake, Cp, Cm, dan TSR. Hasil simulasi menunjukkan bahwa konfigurasi 3 menghasilkan performa aerodinamis terbaik. Turbin upstream mencapai performa optimum pada TSR 1 dengan Cp 0,53 dan Cm 0,53 pada kecepatan angin 5 m/s, sedangkan turbin downstream mencapai performa optimum pada TSR 2 dengan Cp 0,89 dan Cm 0,445. Peningkatan performa dipengaruhi oleh nozzle effect yang meningkatkan percepatan aliran dan perbedaan tekanan pada blade. Dengan demikian, konfigurasi 3 berpotensi menjadi acuan dalam pengembangan sistem Building-Augmented Wind Turbine (BAWT) untuk kondisi angin rendah.
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Indonesia has considerable wind energy potential; however, most regions experience relatively low wind speeds (3–6 m/s), requiring wind turbines that can operate efficiently under such conditions. The Savonius wind turbine, a type of Vertical Axis Wind Turbine (VAWT), is suitable for low wind speeds but has relatively low efficiency due to the high drag force on the returning blade. One approach to improving its performance is the Building-Augmented Wind Turbine (BAWT) concept using a tandem configuration. However, the effect of the adjacent blade position in this configuration remains insufficiently studied. Therefore, this study numerically investigates the effect of the adjacent blade position on the aerodynamic characteristics and performance of a tandem Savonius wind turbine installed beside a building at wind speeds of 3–5 m/s. The study employed Computational Fluid Dynamics (CFD) using ANSYS Fluent 2024 R2 with a 2D Planar, Pressure-Based, Transient solver, the Dynamic Mesh approach, and the Realizable k-ε turbulence model with Enhanced Wall Treatment. The numerical model was validated against the experimental data of Sakti et al. (2021) with a relative error below 1%. A mesh independence test using 112,179 elements yielded an error of 2.6%. Simulations were conducted for three adjacent blade position configurations at wind speeds of 3, 4, and 5 m/s. The evaluated parameters included velocity and pressure distributions, pressure coefficient, turbulence intensity, wake characteristics, coefficient of power (Cp), coefficient of moment (Cm), and tip speed ratio (TSR). The results show that Configuration 3 achieved the best aerodynamic performance. The upstream turbine reached its optimum performance at TSR = 1, with a Cp of 0.53 and a Cm of 0.53 at 5 m/s, while the downstream turbine achieved its optimum performance at TSR = 2, with a Cp of 0.89 and a Cm of 0.445. The improved performance was attributed to the nozzle effect, which enhanced flow acceleration and increased the pressure difference across the blades. These findings indicate that Configuration 3 is the most favorable arrangement and provides a promising reference for the development of Building-Augmented Wind Turbine (BAWT) systems under low wind speed conditions.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Turbin Savonius, Building-Augmented Wind Turbine (BAWT), Konfigurasi tandem, Adjacent blade position, Computational Fluid Dynamics (CFD), Performa aerodinamis. Savonius wind turbine, Adjacent blade position, Building-Augmented Wind Turbine (BAWT), Tandem configuration, Computational Fluid Dynamics (CFD), Aerodynamic performance.
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. T Technology > TJ Mechanical engineering and machinery > TJ820 Wind power T Technology > TJ Mechanical engineering and machinery > TJ828 Wind turbines
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Mohammad Hikmatul Ridho
Date Deposited:	31 Jul 2026 00:49
Last Modified:	31 Jul 2026 00:49
URI:	http://repository.its.ac.id/id/eprint/140122

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