Proceedings of the 22nd International Towing Tank Conference, ITTC'99, Seoul, Korea & Shanghai, China, September 5-11, 1999, Volume II (summary)

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Volume II

22nd

INTERNA TIONAL

TOWING TANK

CONFERENCE

Proceedings

Volume II

Seoul, Korea & Shanghai, China

September 5-11, 1999

Korean Towing Tank Conference

The Society of Naval Architects

of Korea

Chinese Towing Tank Conference

The Chinese Society of Naval

Architects and Marine Engineers

INTERNATIONAL

TOWING TANK

CONFERENCE

Proceedings

Volume II

Seoul, Korea & Shanghai, China

September 5-11, 1999

Korean Towing Tank Conference

The Society of Naval Architects

ofKorea

Chinese Towing Tank Conference

The Chinese Society of Naval

Architects and Marine Engineers

22nd

INTERNATIONAL

TOWING TANK

CONFERENCE

Organizing Committee

Prof. Choung M. Lee(Chair), Pohang University of Science & Technology Prof. Hong Cui Shen(Vice Chair), China Ship Scientific Research Center Dn Seung-II Yang(Secretary), Korea Research Institute of Ships & Ocean Engineering

Prof. Hang Shoon Choi, Seoul National University

Dr. Jin-Tae Lee, Korea Research Institute of Ships & Ocean Engineering Prof. Seung Hee Lee, Inha University

Dr. Keh-Sik Min, Hyundai Maritime Research Institute Prof. Key Pyo Rhee, Seoul National University Prof. Shi-Tang Dong, China Ship Scientific Research Center

Prof. Guo-Qiang Wang, Shanghai Jiao-Tong University Prof. Yan-Yiug Wang, Dalian University of Technology

Prof. Xiu-Heng Wu, Wuhan Transportation University

Sponsors

Korea Research Foundation

Korea Research Institute of Ships & Ocean Engineering The Society of Naval Architects of Korea

The Chinese Society of Naval Architects and Marine Engineers Hyundai Heavy Industries Co., Ltd.

Samsung Heavy Industries Co., Ltd.

Editor

Dr. Seung-Il Yang

On behalf of Chinese Towing Tank Conference and Korean Towing Tank Conference, I take great pleasure in welcoming the 22nd Intemational Towing Tank Conference to Seoul and Shanghai. During the last three years, the members of the technical committees, Advisory Council, and Executive Committee have all contributed their precious time and efforts in carrymg out the assigned tasks, thus raismg the state of the arts in the marine hydrodynamic technology. It would be very difficult to find an intemational professional organization such as ITTC which has been nm with harmoneous cooperations among the member organizations for as long as sixty six years.

The 22nd ITTC witnessed extensive activites of the technical committees. A l l together seventeen committees, five more than in the previous conference, are reporting their accomplishments of the past three years at this meeting. Significant technical achievements are made in the wide areas of marine hydrodynamics which are of fundamental and current interest to the tankery business. The emphasis on the uncertainty analyses for experimental and numerical results are intensified and, for the first time, a review of the qualificatins of one half of the Advisory Council member organizations was carried out, and a manual of ITTC recommended procedures is published. To keep in pace with the information era, the ITTC home page was created which describes in detail the objectives, functions and activities of the ITTC. A l l of these efforts are oriened toward strengthening the quality of the ITTC.

As the demand for efficient, safe and economic marine transportations increases, the challenge to shipbuilding industry becomes more stringent. Thus, ITTC has to fimction as a coordinating body to harness all the advanced technical knowledges and informations to meet the challenges. To advance the technologies in design and prediction of performance of marine vehicles and stmctures and therefore to offer better

technical services to the marine industry, we have laid out the tasks to be performed by

the technical committees of the 23rd ITTC. I am confident that the Committees, following the past tradition, will perform their tasks satisfactorily.

As was the case for the 21st Conference, the venue for the 22nd Conference is not one. One half of the conference v^ll be held in Seoul and the rest of the half will be in Shanghai. Although, the time to be spent for transition fi-om Seoul to Shanghai may seem tedious, I hope it will offer worthwhile experiences to the participants fi-om the Occident in learning more about the oriental culture and it may help all of us to understand reality that we all have to live together as one global community.

Choung M . Lee Chairman, Executive Committee, 22nd ITTC

vi

Table of Contents

Proceedings of the 22"^ ITTC

Volume I I

Preface •

Table of Contents "

Report of the Specialist Committee on Unconventional Propulsors 311

1. Membership and Meetings 311 2. Task set from the 21 st ITTC 311

3. Infroduction 311 4. Model Scale and Full Scale Results of Various Extrapolation Methods

For Unconventional Propulsors 312 5. Description of Extrapolation Methods and Test Procedures 326

6. Discussion of Extrapolation Methodologies 341 7. Draft Conclusions and Recommendations 343

References 344

Report ofthe Specialist Committee on Ice 349

1. General 349 2. Measurement Procedures for Model Ice Properties 350

3. Model Test Procedures for Deformed Ice 361 4. Model Test Procedures for Structures 364 5. Up-dated List of Ice Tank Facilities 365 6. Bibliography of Ships and Structures m Ice 1996-1998 369

7. Comments for the ITTC Reconmiended Procedures 370

General Technical Conclusions 372 Recommendations to the Conference 372 Recommendations for Future Work 372 References

Report of the Specialist Committee on Deep Water Mooring 375

1. Membership and Meetings 375 2. Committee Tasks and Contents of the Reports 375

4. Numerical Models 383 5. Physical Models 389 6. Evaluation of Numerical and Experimental Techniques General Technical 391

Conclusions 394 7. Recommendations to the Conference 394

9. Recommendations for Future work 394 10. References „ 395 Report of the Specialist Committee on Stability 399

1. Introduction 399 2. Background 34Q 3. State of the Art Review of Intact Stability 341

4. State ofthe Art Review of Damage Stability 345 5. Techniques for Numerical Modelling of Intact Stability 348

6. Techniques for Numerical Modelling of Damage Stability 350

7. Guidelines for Benchmark Tests 352 8. Conclusions and Recommendations 355 9. References and Nomenclature 355

Appendix A: Guidelines for Experimental Testing of Intact and Damage

Stability 257

Report ofthe Specialist Committee on Computational Methods for

Propeller Cavitation 433

1. General 4^3 2. Introduction 434 3. Overview of Cavitation Phenomena 434

4. Results of the Questionnaire 438 5. Lifting Surface Methods 44Q 6. Boundary Element Methods 445 7. Euler, RANS and Two-Phase Flow Cavitation Modelling 453

8. General Technical Conclusions

9. Guide for Selection of Methods ! ^ T . . " 457

10. Recommendations for Future Work " , 4 5 7 11. References

Report of the Specialist Committee on Trials and Monitoring 465

1. Membership and Meetings .'..'.*.* 465

2. Tasks of the Specialist Committee 465

3. Introduction "" 4. Taskl: Speed/Power Trials and Analysis . . . 466

5. Task 2: Maneuvering Trials and Analysis . . 479 6. Task 3: Seakeeping Trials and Analysis . . . " 484

7. Task 4: Performance Monitoring System 489

8. Task 5: Use of GPS in Sea Trials 490 9. SC Contribution to ISO Standards for Speed Trials' Evaluation 492

10. General Conclusions

12. Recommendations for Future Work 493

13. Reference List 493 Appendix I Suggested Procedure for Speed / Power Trials 497

Appendix I I Suggested Procedures for Maneuvering Trials 498 Appendix III Suggested Procedure for Seakeeping Trials 505

Report of the Specialist Committee on Model Test of High Speed Marine Vehicles ... 507

1. General 507 2. Introduction ^08 3. Questionnaire on Model Tests of High Speed Marine Vehicles 508

4. Survey of Existing Test Techniques and Procedures 509

5. General Technical Conclusions 539 6. Recommendation to the Conference 541 7. Recommendations for Future Work 541

8. Acknowledgements 542

9. References 542

Report of the Specialist Committee on Cavitation Induced Pressure Fluctuations .... 547

1. Membership and Meetings 547

2. Introduction 548 3. Review of Some Fimdamentals 549

4. Computational Methods for Induced Hull Pressures 552 5. Full Scale Measurements on Propeller Induced Unsteady Pressures 555

6. Model Scale Measurements on Propeller Liduced Unsteady Pressures 562 7. Methods for Reducing Propeller Excitation • 568 8. Outline of Problems and Special Difficulties Including Round Robin Test

Results 573 General Technical Conclusions 577

Recommendations to the Conference on Procedures 578

Recommendations for Future Work 578 List of References

Report of the Specialist Committee on Waterjets 587

1. General 587 2. Literature Update 590

3. Recommended Power Prediction Methods for Waterjet Propulsion Systems 593

4. Waterjet Self-Propulsion Standardization Test 594

5. Conclusions and Recommendations 599 6. References

Appendix A Waterjet Self-Propulsion Standardization Experiment

Report of the Specialist Committee on Safety of High Speed Marine Vehicles 615

1. General 615 2. The Safety of High Speed Craft and the ITTC 616

3. Research into the Safety of High Speed Craft 617

4. Conclusions and Recommendations 640

5. References 641 Report of the Specialist Committee on Environmental Modelling 651

1. General 651 2. Introduction 652 3. Survey and Recommendation of Techniques 652

4. Evaluation of Realistic Wave Time Histories Modelling 665

5. Uncertainties in Full Scale to Model Scale 671

General Conclusions 675 Recommendations to the Conference 676

Recommendations for Future Work 676