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Alternative Title: The Numerical Research for the Effects of Bulb bow shape on Resistance of KCS

Abstract: The energy-saving problem is becoming more and more conspicuous in the process of ship design with the price of international crude oil continually increasing. So it is important to study lines with low resistance by adopting fast and advanced means, and as the bulbous bow have certain potential in reducing the ship resistance.
This thesis uses KCS as the research object is preliminary research the effect of 3 bulbous bow control parameters (the height parameter, the length parameter and the width parameter) on the KCS resistance with the help of CFD method to calculate the total resistance. Research results show that in each control parameter, the change of the length parameter has the greatest influence on the ship`s resistance.
Then this thesis uses orthogonal experiment methods to carry on the comprehensive selection combining with the reform scheme of the bulb bow and gets the best solution which reduces total resistance of the KCS by 1.034%.
The resistance calculations use the ANSYS workbench, which is general commercial software. And it uses Rhino for geometry modeling, ICEM for meshing, and CFX for calculation.
This thesis has a beneficial try for the application of CFD method in ship design. Research results indicate that the prediction of KCS by CFD is credible. Especially, it gives important guidance on the design of bulb bow lines and provide necessary basis for energy-saving development of new ships.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/1382
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001966791

Table Of Contents: Contents

Contents i
List of Figures iv
List of Tables v
Abstract vi

I. Introduction 1
1.1 Background 1
1.2 Overview 3
1.3 Objective of Study 5
1.4 Outline of the Thesis 6

Ⅱ. Fundamental of CFD 8
2.1 General 8
2.2 Equations of Fluid Mechanics 9
2.3 Fluid Dynamic Models 13
2.3.1 Direct Numerical Simulations 13
2.3.2 Large Eddy Simulation 14
2.3.3 Detached Eddy Simulation 15
2.3.4 RANS Turbulence Models 16
2.3.5 Unsteady RANS Turbulence Models 18
2.4 Boundary Conditions 19
2.5 Computational Fluid Dynamic Solver 21
2.6 Numerical Methods 23
2.6.1 Finite Difference Methods 23
2.6.2 Finite Element Methods 24
2.6.3 Finite Volume Methods 25

III.CFD Analysis using CFX 29
3.1 Introduction 29
3.2 Ship Model 29
3.3 Meshing Strategy 31
3.4 CFD setup 35
3.4.1 Creating Expressions for Initial and Boundary Conditions 35
3.4.2 Creating the Domain and Boundaries 36
3.5 Result of CFD Analysis 41

Ⅳ. The Research on Bulbous Bow Control Parameters 46
4.1 Introduction 46
4.2 Bulb Forms and Parameters 47
4.3 The Research on Remodeling Bulbous Bow 52
4.3.1 The Effect of Resistance about CZB 52
4.3.2 The Effect of Resistance about CLPR 58
4.3.3 The Effect of Resistance about CBB 60
4.4 Discussion 62

V. Comprehensive Selection of Reform Scheme by Orthogonal Design 63
5.1 Introduction 63
5.2 Design and Implementation 64

VI. Conclusion 68

국 문 요 약 70

References 72

Acknowledgements 74

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