Salsabila Maulida Putri Darsono, . (2026) ANALISIS COMPUTATIONAL FLUID DYNAMIC TERHADAP PERFORMANSI NOZZLE HIGH-PRESSURE WATERJET PADA VARIASI GEOMETRI DAN KEKASARAN PERMUKAAN. Skripsi thesis, Universitas Pembangunan Nasional Veteran Jakarta.
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Abstract
As an archipelagic country, Indonesia has a high level of maritime activity and accident risk, which necessitates a fast, reliable, and efficient Search and Rescue (SAR) system. One propulsion technology widely used on high-speed SAR vessels is waterjet propulsion, whose performance is strongly influenced by the flow characteristics inside the high-pressure nozzle. The nozzle plays a crucial role in determining the resulting Thrust force; therefore, nozzle design optimization is essential for improving the performance of high-speed vessels. This study aims to analyze the effects of nozzle geometry variation and wall surface roughness on the performance of a high-pressure waterjet using a Computational Fluid Dynamics (CFD) approach. The investigated model is a two-dimensional (2D axisymmetric) convergent–cylindrical nozzle with contraction angles of 13°, 30°, and 60°. Wall surface roughness is varied in the form of equivalent sand-grain roughness converted from average roughness (Ra), while inlet pressure is varied within the range of 7–15 MPa. Performance parameters analyzed include Thrust force, flow coefficient (C_d), and outlet velocity. The simulation results indicate that increasing inlet pressure consistently increases outlet velocity and Thrust force for all geometric variations. A moderate contraction angle provides more stable flow characteristics compared to smaller or larger angles.
| Item Type: | Thesis (Skripsi) |
|---|---|
| Additional Information: | [No.Panggil: 2110313035 [Pembimbing: Fathin Muhammad Mahdhudhu, .] [Penguji 1: Fajri Ashfi Rayhan] [Penguji 2: Fakhri Akbar Ayub] |
| Uncontrolled Keywords: | high-pressure waterjet, Thrust force, surface roughness |
| Subjects: | V Naval Science > V Naval Science (General) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
| Divisions: | Fakultas Teknik > Program Studi Teknik Perkapalan (S1) |
| Depositing User: | SALSABILA MAULIDA PUTRI DARSONO |
| Date Deposited: | 10 Apr 2026 05:55 |
| Last Modified: | 10 Apr 2026 05:55 |
| URI: | http://repository.upnvj.ac.id/id/eprint/42515 |
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