Studi Eksperimental Aliran Melintasi Silinder Sirkular Tunggal Dengan Penempatan Plat Splitter Pada Bagian Downstream "Studi Kasus Jarak Gap Dan Ketebalan Plat Splitter"

Amornanta Wirasena, Gregorius Raka (2026) Studi Eksperimental Aliran Melintasi Silinder Sirkular Tunggal Dengan Penempatan Plat Splitter Pada Bagian Downstream "Studi Kasus Jarak Gap Dan Ketebalan Plat Splitter". Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Aliran fluida yang melewati silinder sirkular menghasilkan fenomena wake dan vortex shedding yang dapat meningkatkan gaya hambat serta menurunkan performa aerodinamis. Salah satu metode pasif untuk mengendalikan fenomena tersebut adalah dengan penambahan plat splitter di bagian hilir silinder. Penelitian ini bertujuan untuk menganalisis pengaruh variasi jarak dan ketebalan splitter terhadap karakteristik aliran, khususnya terhadap distribusi kecepatan, tekanan, dan koefisien drag tekanan (CDP). Eksperimen dilakukan menggunakan terowongan angin pada bilangan Reynolds sebesar 2,53 × 10⁴. Variasi yang digunakan meliputi jarak splitter terhadap silinder (g/D = 0,14; 0,28; 0,42; dan 0,55) serta ketebalan splitter (t/D = 0,08 dan 0,14). Parameter yang dianalisis meliputi distribusi tekanan permukaan, profil kecepatan aliran, dan nilai koefisien drag tekanan yang dihitung berdasarkan hasil pengukuran tekanan. Hasil penelitian menunjukkan bahwa penambahan splitter mampu mengurangi defisit kecepatan dan meningkatkan kestabilan aliran di daerah wake. Peningkatan jarak splitter menghasilkan penurunan nilai CDP pada jarak yang optimal, yaitu dengan konfigurasi terbaik untuk menurunkan drag pada L/D = 1,5, g/D = 0,55 serta dengan ketebalan tipis t/D = 0,08. Hasil ini menunjukkan bahwa penggunaan plat splitter merupakan metode pasif yang efektif untuk mengendalikan karakteristik aliran dan menurunkan gaya hambat pada silinder sirkular pada jarak tertentu dengan ketebalan tertentu.
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The flow around a circular cylinder is commonly associated with wake formation and vortex shedding, which can significantly increase aerodynamic drag. One effective passive method to control this phenomenon is the use of a splitter plate placed downstream of the cylinder. This study investigates the effect of splitter plate installation on the flow characteristics and pressure drag of a circular cylinder. The experiments were conducted in a wind tunnel at a Reynolds number of 2.53 × 10⁴. Variations of splitter plate distance (g/D = 0.14, 0.28, 0.42, and 0.55) and splitter thickness (t/D = 0.08 and 0.14) were examined. The flow characteristics were analyzed through velocity profiles, pressure distribution measurements, and calculation of the pressure drag coefficient (CDP). The results show that the addition of a splitter plate has a significant influence on the wake structure behind the cylinder. Increasing the splitter distance reduces the velocity deficit and stabilizes the wake region. The lowest pressure drag coefficient was obtained at a splitter distance of g/D = 0.55 and with a length of L/D = 1.5, indicating a more stable and symmetric flow structure. The splitter thickness shows that the thin splitter plate with t/D = 0.08 has more reduction in the drag pressure effect on a big gap from the cylinder. Overall, the results demonstrate that the use of a splitter plate is an effective passive flow control method for reducing aerodynamic drag and improving flow stability around a circular cylinder.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Silinder sirkular, Splitter plate, Aliran turbulen, Koefisien drag, Wake, Kontrol aliran, Distribusi tekanan, Terowongan angin, Circular cylinder, Splitter plate, Turbulent flow, Wake, Drag coefficient, Flow control, Wind tunnel
Subjects:	T Technology > TH Building construction > TH900+ Construction equipment in building construction T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines. T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Gregorius Raka Amornanta Wirasena
Date Deposited:	03 Feb 2026 07:14
Last Modified:	03 Feb 2026 07:14
URI:	http://repository.its.ac.id/id/eprint/131689

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