Proceedings of 26th ITTC – Volume I 11 The Resistance Committee Final Report and Recommendations to the 26th ITTC China Ship Scientific Research Centre (CSSRC), CHINA 1. INTRODUCTION 1.2 Meetings 1.1 Membership The committee met 4 times: Chairman: 13-15 January 2009, Madrid, Spain Dr. Joseph Gorski 15-16 September 2009, Busan, Korea Naval Surface Warfare Center, Carderock 18-19 May 2010, Nantes, France Division, UNITED STATES OF AMERICA 18-19 January 2011, Hamburg, Germany Secretary: Prof. Stephen Turnock 1.3 Tasks University of Southampton, UNITED KINGDOM Below we list the tasks carried out by the 26th resistance committee (RC), based on the Members: recommendations given by the 25th ITTC. Dr. Bertrand Alessandrini Ecole Centrale Nantes (ECN), FRANCE 1. Update the state-of-the-art for predicting the resistance of different ship concepts Dr. Ho-Hwan Chun emphasising developments since the 2008 Pusan National University, KOREA ITTC Conference. The committee report should include sections on: Dr. Uwe Hollenbach a) the potential impact of new Hamburg Ship Model Basin (HSVA), technological developments on the GERMANY ITTC, b) new experimental techniques and Dr. Tommi Mikkola extrapolation methods, Aalto University, FINLAND c) new benchmark data, d) the practical applications of Dr. Yusuke Tahara computational methods to resistance National Maritime Research Institute (NMRI), predictions and scaling, JAPAN e) the need for R&D for improving methods of model experiments, Dr. Jesús Valle numerical modelling and full-scale Escuela Técnica Superior de Ingenieros measurements. Navales (ETSIN), SPAIN 2. Review ITTC Recommended Procedures relevant to resistance (including procedures Dr. Liangmei Ying for uncertainty analysis). The Resistance Committee 12 a) Identify any requirements for changes Method. Liaise with the Propulsion in the light of current practice, and, if Committee. approved by the Advisory Council, 8. Continue the tests in the ITTC worldwide update them. series for identifying facility biases. b) Identify the need for new procedures Prepare a common calculation sheet to and outline the purpose and content of analyze the results of the tests. Check and these. record the model dimensions regularly. c) With the support of the Specialist Committee on Uncertainty Analysis, review and if necessary amend, 2. FACILITY BIAS WORLDWIDE Procedures 7.5-02-02-03, 04, 05 and CAMPAIGN 06 "Uncertainty Analysis spreadsheets for measurements of resistance, speed, The 24th ITTC Resistance Committee sinkage and trim and wave profile" and invited all the ITTC members to participate in a Procedure 7.5-0302-01 "Uncertainty worldwide series of comparative tests for Analysis in CFD Example for identifying facility biases under the framework Resistance and Flow to bring them into of ITTC procedures for uncertainty analysis. line with the ISO approach adopted by The tests were done during the 24th and 25th the ITTC. ITTCs and continued during the 26th ITTC 3. Identify the parameters that cause the period. largest uncertainties in the results of model experiments, numerical modelling and full- For these tests two geosims of the DTMB scale measurements related to resistance. 5415 Combatant with 5.720 and 3.048 meters 4. Survey and document the range of practices length, respectively, have been used. adopted for turbulence stimulation. Update parts of Recommended Procedure 7.5-01- The Committee created and distributed a 01-01, Model Manufacture which deal with technical procedure for identifying facility turbulence stimulation, paying particular biases, compiling model and test procedure attention to different kinds of bulbous bows information, including data submission and high-speed ships. Liaise with the guidance to preserve the confidentiality of the Specialist Committee on High-Speed Craft. data. 5. Review ITTC Recommended Procedures relevant to scaling and extrapolation Facility biases have been analysed for the methods including theoretical and following most typical towing tank tests: experimental investigations of the friction . Resistance line. Note: At the present time the ITTC . Sinkage and trim does not consider introducing a new . Wave profile and wave elevations friction line without extensive validation. 6. Make the concept of form factor consistent in all relevant ITTC procedures. Include the 2.1 Participants form factor in the formulation of the ITTC 1957 friction line as an option in ITTC In the 24th ITTC 20 institutions of 15 Recommended Procedure 7.5-02-02-01, countries participated in the worldwide "Resistance Tests". campaign. The number of institutions was 7. Review methods used for the scaling of increased during the 25th ITTC to 35 and the appendage resistance, especially in relation to the problem of pod drag scaling. Ensure number of countries to 19. The number of that the appendage drag scaling is treated participating institutions increased again during consistently for resistance, propulsion and the 26th ITTC to the number of 41 and the the 1978 Powering Performance Prediction number of countries to 20. Proceedings of 26th ITTC – Volume I 13 The tests for the 5.720 m length model been postponed. finished at the beginning of 2011, on time for the 26th ITTC. The participant institutions, The provisional schedule, indicating the their countries and the month of reception of month of reception of the model, is the model are shown in the following table. summarized in the following table. Table 1. 5.720 m length model tests. Table 2. Schedule for the 3.048 m length Reception model. Institution Country month Reception Institution Country CEHIPAR Spain Jun 2004 month INSEAN Italy Sep 2004 CEHINAV Spain Feb 2005 Helsinki University of LSMH/NTUA Greece Apr 2005 Finland Nov 2004 Technology Inha University Korea Dec 2005 Krylov Shipbuilding Research Russia Feb 2005 Seoul National University Korea Jan 2006 Institute Pusan National University Korea Feb 2006 ICEPRONAV S.A. Romania Sep 2005 Ulsan University Korea Mar 2006 Vienna Model Basin Austria Dec 2005 Harbin Engineering University China ------- Huazhong University of Science China ------- and Technology University Teknologi Malaysia Malaysia Sep 2006 CSSRC China Sep 2007 Australian Maritime College Australia Nov 2006 Canal de Experiencias de Samsung Ship Model Basin Korea Dec 2007 Argentina Feb 2007 Arquitectura Naval MOERI Korea Feb 2008 University of Iowa – IIHR USA Jul 2007 Pusan National University Korea Apr 2008 Stevens Institute of Technology USA Jan 2009 Akashi Laboratory Japan First Memorial University Canada Sep 2009 IHI Corporation Japan Institute for Ocean Technology Canada Nov 2009 Universal Zosen Japan Aug 2008 IPT – Instituto de Pesquisas Brazil Apr 2010 Akisima Laboratory Japan Tecnológicas do Estado Ship Research Center (NMRI) Japan University of Glasgow and UK Postponed Osaka University Japan Strathclyde Naval Surface Warfare Center USA Mar 2009 University of Liège – ANAST Belgium Postponed Institute for Ocean Technology Canada Sep 2009 Ecole Centrale de Nantes France Postponed QinetiQ UK Apr 2010 Istanbul Technical University Turkey Postponed Bassin d’Essais des Carenes France Aug 2010 INSEAN Italy Postponed CEHIPAR Spain Mar 2011 CEHIPAR Spain Postponed The tests for the 3.048 m length model did not finish on time for the 26th ITTC due to the 2.2 Dimensional Control of the Model following causes: . The accumulated delays, the internal In order to guarantee the quality of the planning and the amount of work of the results the dimensions of the model were institutions increased the testing periods. controlled in some facilities. Minor scratches . The required time to move the models and paint failures were detected for both between institutions was longer than models and they were repaired when necessary. predicted. There were not important deformations of the . There was a problem sending the model model. from Brazil to the United Kingdom. When these proceedings were written the model A complete comparison of the dimensions was still retained in the customs and that is of the 5.720 m length model was done at the reason why the remaining tests have CEHIPAR, comparing the measurements of the The Resistance Committee 14 model after the tests with the original data facilities participating in the experience, was used to manufacture the model. There were not detailed in the Proceedings of the 25th ITTC. important deviations which could affect the tests. 2.5 Analysis Program 2.3 Testing Procedure and Data Submission Due to the number of calculations and the great amount of data used in the analysis Each institution has tested the model in 4 method, a computer program has been created different sessions, in order to change the test to facilitate the analysis. conditions and obtain better uncertainty analysis results. All the Institutions have used A new version of the program with their standard techniques to test the models and corrected bugs is available on the ITTC web have corrected their results taking into account page. The user manual, the submitted data for the blockage effects, using their standard both models and the program installer are procedures. included in the following files: . Manual.pdf During each session, 10 runs were done, . DataForLargeModel.zip with Froude numbers 0.10, 0.28 and 0.41. DataForSmallModel.zip . ITTC Setup.msi The results of the tests have been submitted to the Resistance Committee using ASCII When these proceedings were written, the neutral files. The content of these files is submitted data for both models was not specified in the technical procedure for complete, so only analysis of the existing data identifying facility biases and the proceedings has been done. The entire data set for the of the 25th ITTC. analysis will be actualized in the ITTC web page by changing the following files. DataForLargeModel.zip 2.4 Analysis Method . DataForSmallModel.zip In January 2008, the Resistance Committee and the Uncertainty Analysis Committee had 2.6 Submitted Data their first meetings in Madrid. That was a good opportunity to meet together and discuss the During the 25th ITTC only 9 data sets were analysis method to be used for the facility bias received, 4 for the large model and 5 for the worldwide campaign.