Naura, Dyanriza (2026) Studi Numerik Pengaruh Ketinggian Block Bump dan Domed-Block Bump terhadap Karakteristik Aliran di Atas Pelat Datar dengan Variasi Bilangan Reynolds. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Upaya efisiensi energi pada sektor transportasi sangat bergantung pada optimalisasi performa aerodinamika kendaraan, karena gaya hambat (drag) yang tinggi berkontribusi langsung pada peningkatan konsumsi bahan bakar. Gaya hambat dipengaruhi oleh fenomena lapisan batas (boundary layer) dan pemisahan aliran (flow separation) akibat gradien tekanan balik. Salah satu metode untuk mengendalikan transisi aliran dan menunda separasi adalah dengan menambahkan tonjolan kecil atau bump sebagai turbulator pada permukaan. Penelitian ini bertujuan untuk mengetahui pengaruh geometri dan ketinggian bump berbentuk block bump dan domed-block bump pada pelat datar dengan variasi ketinggian 5 mm dan 7 mm terhadap karakteristik aliran dan intensitas turbulensi. Simulasi dilakukan secara numerik dua dimensi (2D) menggunakan perangkat lunak ANSYS Fluent dengan model turbulensi k–ω SST. Variasi bilangan Reynolds yang digunakan adalah 1,3 × 104 dan 2,1 × 104. Data yang dianalisis meliputi profil kecepatan, koefisien tekanan (Cp), intensitas turbulensi, drag coefficient (Cd), serta shape factor (H) untuk mengidentifikasi karakteristik transisi aliran dari laminar ke turbulen. Hipotesis dalam penelitian ini adalah penambahan block bump dan domed-block bump mampu memicu transisi aliran lebih cepat dibandingkan pelat datar tanpa bump, di mana gangguan yang dihasilkan akan semakin besar seiring dengan peningkatan ketinggian bump dan bilangan Reynolds. Hasil penelitian ini diharapkan dapat memberikan pemahaman mendalam mengenai hubungan antara geometri bump dengan karakteristik aliran dalam upaya meningkatkan efisiensi aerodinamika.
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Energy efficiency efforts in the transportation sector are highly dependent on optimizing vehicle aerodynamic performance, as high drag directly contributes to increased fuel consumption. The resistance force is affected by the phenomenon of boundary layer and flow separation due to the reverse pressure gradient. One method to control the flow transition and delay separation is to add a small bump or bump as a turbulator to the surface. This study aims to determine the influence of the geometry and height of bumps in the form of block bumps and domed-block bumps on flat plates with height variations of 5 mm and 7 mm on flow characteristics and turbulence intensity. The simulation was performed numerically two-dimensional (2D) using ANSYS Fluent software with a turbulence model k ω SST. The variation of the Reynolds number used is 1,3 × 104and 2,1 × 104. The data analyzed included velocity profiles, pressure coefficient (Cp), turbulence intensity, drag coefficient (Cd), and shape factor (H) to identify the characteristics of flow transition from laminar to turbulent. The hypothesis in this study is that the addition of block bumps and domed-block bumps can trigger a faster flow transition than flat plates without bumps, where the resulting disturbance will be greater as the bump height and Reynolds number increase. The results of this study are expected to provide an in-depth understanding of the relationship between bump geometry and flow characteristics in an effort to improve aerodynamic efficiency.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Aerodinamika, Boundary Layer, CFD, Domed-Block Bump, Drag Coefficient, Reynolds Number, Aerodynamics, Boundary Layers, CFD, Domed-Block Bumps, Drag Coefficients, Reynolds Numbers. |
| Subjects: | T Technology > T Technology (General) > T57.62 Simulation T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Dyanriza Naura |
| Date Deposited: | 01 Aug 2026 06:09 |
| Last Modified: | 01 Aug 2026 06:09 |
| URI: | http://repository.its.ac.id/id/eprint/141461 |
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