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ITS » Undergraduate Theses » Teknik Kelautan
Posted by dee@its.ac.id at 07/12/2011 09:24:16  •  1354 Views


ANALISA PENAMBAHAN BATANG KAWAT PADA SISI LUAR PIPA RISER SEBAGAI PEREDUKSI GAYA FLUIDA DAN VORTEX-INDUCED VIBRATION VIV

ANALYSIS OF THE TRIPPING RODS ADDITION ON THE OUTSIDE OF THE RISER AS A REDUCING FLUID FORCE AND VORTEX-INDUCED VIBRATION VIV

Author :
HAQIQI, IHWAN ARIF  ( 4306100006 )




ABSTRAK

Salah satu masalah pada riser akibat interaksinya dengan arus laut adalah fenomena vortex-induce vibration VIV yang mana dapat memperbesar induksi gaya fluida. Bertambahnya induksi gaya fluida menyebabkan defleksi dan vibrasi dari riser bertambah dan berpotensial menyebabkan kelelahan pada pipa riser. Salah satu cara untuk meredam terjadinya VIV pada riser yaitu dengan menambahkan perangkat VIV passive control seperti streamline fairings atau helical strakes. Namun dengan penambahan perangkat tersebut menyebabkan membesarnya induksi gaya fluida. Tugas akhir ini memaparkan tentang hasil penelitian tentang perangkat VIV passive control alternatif dengan menggunakan batang kawat untuk mengurangi induksi gaya drag dan VIV pada riser. Penelitian ini dilakukan secara numerik dengan menggunakan metode computational fluids dinamic CFD. Silinder dengan diameter 0.5m digunakan dengan empat variasi diameter batang kawat. Digunakan rasio diameter dD of 0.01 0.02 0.08 dan 0.10 dengan variasi rasio gap sebesar gD of 0.1-0.5. Selain itu digunakan variasi pemasangan batang kawat dengan sudut 20o 30o 45o 60o dan 90o. Arus searah digunakan untuk pengujian pada variasi Re 5.8E5 2E4 dan 1E3 subcritical Reynolds number. Validasi model menunjukkan hasil yang sesuai dengan eksperimen. Setelah penambahan batang kawat pengujian dengan Re 5.8E5 2E4 menunjukkan pola peredaman gaya drag dan VIV yang baik namun kurang efektif pada Re 1E3.


ABSTRACT

One problem on the riser due to its interaction with the ocean current is that the vortex-induce vibration VIV phenomenon occurred which enlarge the induced fluid forces. Consequently both deflection and vibration of the riser increase and potentially lead to fatigue failure on the riser. Traditionally the way to suppress the VIV of the riser is to add VIV passive control devices such as streamline fairings or helical strakes on it. Unfortunately the drag force increases due to the devices. This paper presents the results of a study on the use of an alternative vortex suppression device by means of the use of tripping rods in order to reduce induced drag force acting on the riser. The study was conducted numerically by using Computational Fluid Dynamic CFD method. A cylinder model of 0.5m in diameter D was used with four different diameters d of the tripping rods. The diameter ratio dD of 0.01 0.02 0.08 and 0.10 were used as well as the gap ratio gD of 0.1-0.5. In addition the angle between each rod of 20o 30o 45o 60o and 90o were used. A uniform current was applied on each case run to form a Re of 5.8E5 2E4 and 1E3 subcritical Reynolds number. Model validation showed a good agreement with other existing experimental work. After the addition of tripping rods Re 5.8E5 2E4 shows the pattern of testing with the drag force and VIV reduction are effective but less effective at Re 1E3.



KeywordsVortex-induced Vibration (VIV); Passive control devices; Tripping rods; Drag force; fluid forces; Computational Fluids Dynamic (CFD).
 
Subject:  Pipanisasi; Teknik perpipaan
Contributor
  1. Prof. Ir. Paul Indiyono, M.Sc., Ph.D.
  2. Dr. Eng. Rudi Walujo Prastianto, ST., MT.
Date Create: 07/02/2010
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100011043232
Collection ID: 3100011043232
Call Number: RSKe 665.544 Haq a


Source
Undergraduate Thesis of Offshore Engineering, RSKe 665.544 Haq a, 2011

Coverage
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Rights
Copyright @2010 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




[ Download - Open Access ]

  1.  ITS-Undergraduate-16589-Abstract_id.pdf - 189 KB
  2.  ITS-Undergraduate-16589-Abstract_en.pdf - 188 KB
  3.  ITS-Undergraduate-16589-Conclusion-193447.pdf - 189 KB
  4.  ITS-Undergraduate-16589-4306100006-Paper.pdf - 1578 KB




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