Masrur, Muhammad (2016) Simulasi Numerik 3d Pengaruh Penambahan Triangular Bump Pada Aliran Backward-Facing Step. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian ini untuk mengetahui karakteristik aliran pada backward-facing
step dengan penambahan triangular bump. Aliran pada backward-facing step
dimulai lapisan batas upstream terpisahkan pada tepi ujung backward-facing step
yang berkembang menjadi shear layer yang tipis. Struktur turbulen pada daerah
shear layer ini meningkat menyebabkan pembentukan resikulasi kecepatan rendah
dan memberikan preasure drop pada daerah tersebut. Daerah resikulasi kecepatan
rendah sangatlah tidak diinginkan sehingga dilakukanlah manipulasi atau kontrol
medan aliran, salah satunya dengan penambahan triangular bump pada variasi jarak
yang berbeda. Penelitian ini bertujuan untuk mengetahui berapa jarak yang
optimum untuk memperkecil daerah resikulasi kecepatan rendah.
Penelitian ini dilakukan secara numerik 3D steady-RANS menggunakan
software commercial CFD dengan turbulence model realizable k-ε dan near wall
treatment berupa non equilibrium wall functions. Geometri backward-facing step
yang disimulasikan memiliki ekspansi rasio 1.125 dan triangular bump yang
diletakkan pada sisi upstream memiliki ketinggian
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This study to determine the flow characteristics using a backward-facing step with
the addition of triangular bump. The flow in the backward-facing step begins upstream
boundary layer integral to the trailing edge of the backward-facing step that develops into a
thin shear layer. The structure of turbulent shear layer in this area led to the formation
recirculation increased low speed and provides pressure drop in the area. Recirculation
regions low speed is not desirable to perform the manipulation or control of the flow field, one
of them with the addition of triangular bump on a variety of different distances. This study aims
to determine how far the distance is optimum for low speed recirculation region.
This research was carried out numerically 3D steady-rans using commercial CFD
software with turbulence realizable k - ε models and the near wall treatment in the form of nonequilibrium
wall functions. Geometry backward-facing step is simulated has an expansion
ratio (Er) of 1.125 and a triangular bump that is placed on the upstream side has a height
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTM 629.134 32 Mas s |
| Uncontrolled Keywords: | backward-facing step, triangular bump, turbulence model k-ε, sisi upstream, shear layer. |
| Subjects: | Q Science > QC Physics > QC151 Fluid dynamics |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | EKO BUDI RAHARJO |
| Date Deposited: | 21 May 2020 05:56 |
| Last Modified: | 21 May 2020 05:58 |
| URI: | http://repository.its.ac.id/id/eprint/76023 |
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