Effects of fin stabilizer configurations on semi swath resistance

The installation of the fin stabilizers on the Semi Small Waterplane Area Twin Hulls (Semi SWATH) vessel reduces the disadvantages of its low restoring force. The important role of the fins in increasing the lift force on Semi SWATH brings the need for the hydrodynamic assessment, including the effe...

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Main Author:	Ali, Arifah
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/79249/1/ArifahAliPFKM2018.pdf
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id	my-utm-ep.79249
record_format	uketd_dc
spelling	my-utm-ep.792492018-10-14T08:39:50Z Effects of fin stabilizer configurations on semi swath resistance 2017 Ali, Arifah TJ Mechanical engineering and machinery The installation of the fin stabilizers on the Semi Small Waterplane Area Twin Hulls (Semi SWATH) vessel reduces the disadvantages of its low restoring force. The important role of the fins in increasing the lift force on Semi SWATH brings the need for the hydrodynamic assessment, including the effect of fins on the Semi SWATH resistance. In this thesis, the resistance and wake wash of the Semi SWATH model with separation over length ratio, 0.35 and 0.30 were investigated. The investigation considers the fin stabilizers’ configurations, which change the induced drag and lift and flow pattern around the hulls. Numerical simulation was carried out to examine the mentioned criteria using the ANSYS CFX software with build in Reynolds Average Navier-Stokes (RANS) code in deep and shallow water conditions. Validation of the numerical result was based on the experimental result, which was performed in towing tank at the Universiti Teknologi Malaysia. It was discovered that the computational result showed up to 11% maximum average error. This error is larger as compared with other catamaran computational cases, which is mainly caused by the limitation of the computational tools in producing good computational grid and simulating the turbulence free surface flow in the complex hull form. It was concluded that the fins’ installation angle changes the pressure distribution and wave propagation around the hulls, which increases the total resistance up to 70.9% in deep water and 40.3% in shallow water by average. The resistance increment from shallow water effect for the hulls with 15º fin angle showed 56.5% reduction compared to the bare hulls case. An extended parametric study in shallow water concluded that the total resistance enlargement can be avoided by 27.7% from the appropriate hull and fin parameters, including smaller water depth, larger hull separation distance and small angle of fore fin stabilizers. The findings of the research can be a guideline for the modification of the fin stabilizer configurations for the catamaran and the extending application of Semi SWATH in shallow water region. 2017 Thesis http://eprints.utm.my/id/eprint/79249/ http://eprints.utm.my/id/eprint/79249/1/ArifahAliPFKM2018.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Ali, Arifah Effects of fin stabilizer configurations on semi swath resistance
description	The installation of the fin stabilizers on the Semi Small Waterplane Area Twin Hulls (Semi SWATH) vessel reduces the disadvantages of its low restoring force. The important role of the fins in increasing the lift force on Semi SWATH brings the need for the hydrodynamic assessment, including the effect of fins on the Semi SWATH resistance. In this thesis, the resistance and wake wash of the Semi SWATH model with separation over length ratio, 0.35 and 0.30 were investigated. The investigation considers the fin stabilizers’ configurations, which change the induced drag and lift and flow pattern around the hulls. Numerical simulation was carried out to examine the mentioned criteria using the ANSYS CFX software with build in Reynolds Average Navier-Stokes (RANS) code in deep and shallow water conditions. Validation of the numerical result was based on the experimental result, which was performed in towing tank at the Universiti Teknologi Malaysia. It was discovered that the computational result showed up to 11% maximum average error. This error is larger as compared with other catamaran computational cases, which is mainly caused by the limitation of the computational tools in producing good computational grid and simulating the turbulence free surface flow in the complex hull form. It was concluded that the fins’ installation angle changes the pressure distribution and wave propagation around the hulls, which increases the total resistance up to 70.9% in deep water and 40.3% in shallow water by average. The resistance increment from shallow water effect for the hulls with 15º fin angle showed 56.5% reduction compared to the bare hulls case. An extended parametric study in shallow water concluded that the total resistance enlargement can be avoided by 27.7% from the appropriate hull and fin parameters, including smaller water depth, larger hull separation distance and small angle of fore fin stabilizers. The findings of the research can be a guideline for the modification of the fin stabilizer configurations for the catamaran and the extending application of Semi SWATH in shallow water region.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ali, Arifah
author_facet	Ali, Arifah
author_sort	Ali, Arifah
title	Effects of fin stabilizer configurations on semi swath resistance
title_short	Effects of fin stabilizer configurations on semi swath resistance
title_full	Effects of fin stabilizer configurations on semi swath resistance
title_fullStr	Effects of fin stabilizer configurations on semi swath resistance
title_full_unstemmed	Effects of fin stabilizer configurations on semi swath resistance
title_sort	effects of fin stabilizer configurations on semi swath resistance
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2017
url	http://eprints.utm.my/id/eprint/79249/1/ArifahAliPFKM2018.pdf
_version_	1747818182538690560

Effects of fin stabilizer configurations on semi swath resistance

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