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A Simulation Model for A Single Point Moored Tanker – PhD Thesis

  


A Simulation Model for A Single Point Moored Tanker – PhD Thesis

TOC

1. INTRODUCTION

2. LOW VELOCITY DEPENDENT WAVE DRIFT FORCES
2.1 Introduction
2.2 Equations of motion for a tanker in head waves
2.3 Displacement and velocity dependency of the hydrodynamic forces
2.4 Experimental verification of the velocity dependency of the mean wave drift force in regular waves
2.4.1 Test set-up and measurements
2.4.2 Extinction tests in still water and in waves
2.4.3 Towing tests
2.4.4 Evaluation of results of extinction tests and towing tests
2.4.5 Deviation from linearity at higher forward speeds
2.5 The mean wave drift force in regular waves combined with current
2.5.1 Towing speed versus current speed
2.5.2 Regular waves travelling from an area without current into an area with current
2.6 Computation of the low velocity dependent wave drift forces
2.6.1 Introduction
2.6.2 Theory
2.6.2.1 Linear ship motions at forward speed
2.6.2.2 Wave drift force at low forward speed
2.6.3 Results of computations and model tests
2.6.4 Evaluation of results
2.7 The low frequency components of the wave drift forces and the wave drift damping coefficient
2.7.1. Introduction
2.7.2. Wave  drift  forces at zero speed
2.7.3. The approximation of the Low frequency components
2.7.4. Total wave drift force in irregular waves without current
2.7.5. Stability of the solution and contribution of the oscillating wave drift damping coefficient
2.7.6. Total wave drift force in irregular waves combined with current
2.7.7. Evaluation of results in irregular waves

3. HYDRODYNAMIC VISCOUS DUPING FORCES CAUSED BY THE LOW FREQUENCY MOTIONS OF A TANKER I N THE HORIZONTAL PLANE
3.1. Introduction
3.2. Equations of the low frequency motions
3.3. Hydrodynamic viscous damping forces in still water
3.3.1. Equations of motion in still water
3.3.2. Test set-up and measurements
3.3.3. Viscous damping i n the surge mode of motion
3.3.4. Viecous damping due to sway and yaw motions
3.4. Hydrodynamic viscous damping forces in current
3.4.1 Equations of motion in current
3.4.2. Test set-up and measurements
3.4.3. Current force/moment coefficients
3.4.4. Relative current velocity concept for the surge mode of motion
3.4.5. Relative current velocity concept for the sway mode of motion
3.4.6. The dynamic current contribution
3.4.7. Evaluation of the semi-empirical mathematical models in current

4. EVALUATION OF THE LOW FREQUENCY SURGE MOTIONS IN IRREGULAR HEAD WAVES
4.1 Introduction
4.2. Frequency domain computations in irregular head waves without current
4.2.1. Theory
4.2.2. Computations
4.2.3. Model tests
4.2.4. Evaluation of results
4.3. Time domein computations in irregular head waves with and without current
4.3.1. Theory
4.3.2. Computed wave drift forces and mean wave drift damping coefficient
4.3.3. Computed motions
4.3.4. Model tests
4.3.5. Evaluation of results

5. EVALUATION OF THe LOW FREQUENCY HYDRODYNAMIC VISCOUS DAMPING FORCES AND LOW FREQUENCY MOTIONS IN THE HORIZONTAL PLANE
5.1. Introduction
5.2. Tanker moored by a bow haweer exposed to regular waves
5.2.1. Introduction
5.2.2. Computations
5.2.3. Model tests
5.2.4. Evaluations of results
5.3. Tanker moored by a bow hawser exposed to current
5.3.1. Introduction
5.3.2. Computations
5.3.3. Model tests
5.3.4. Evaluation of results
5.4 . Tanker moored by a bow hawser exposed to current and wind
5.4.1. Dynamic stability of a tanker moored by a bow hawser
5.4.2. Determination of the stability criterion
5.4.3. Computations
5.4.4. Model teste
5.4.5. Evaluation of results

6. SIMULATION OF THE LOW FREQUENCY MOTIONS OF A TANKER MOORED BY A BOW HAWSER IN IRREGULAR WAVES. WIND AND CURRENT
6.1. Introduction
6.2. Equations of motion
6.3. Computations
6.4. Model tests
6.5. Evaluation of results

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