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CFD Simulation of Motion Response of a Trimaran in Regular Head Waves 三体船在规则头波中运动响应的CFD模拟

Royal Institution of Naval Architects Transactions Pub Date : 2020-03-01 DOI: 10.3940/rina.ijme.2020.a1.595

L. Nowruzi, H. Enshaei, J. Lavroff, S. Kianejad, Davis

{"title":"CFD Simulation of Motion Response of a Trimaran in Regular Head Waves","authors":"L. Nowruzi, H. Enshaei, J. Lavroff, S. Kianejad, Davis","doi":"10.3940/rina.ijme.2020.a1.595","DOIUrl":"https://doi.org/10.3940/rina.ijme.2020.a1.595","url":null,"abstract":"CFD has proved to be an effective method in solving unsteady Reynolds–Averaged Navier-Stokes (RANS) \u0000equations for analysing ships in free surface viscous flow. The research reported in this paper is intended to \u0000develop a better understanding of the parameters influencing high-speed trimaran motions responses. Gridding \u0000system, time step and reliability analysis were performed in solving RANS equations. Different turbulence \u0000models were investigated, and the SST Menter K Omega turbulence model proved a more accurate model than \u0000Realizable K-epsilon model. In order to validate the CFD method, the results of the motions response of a highspeed \u0000trimaran are compared against a set of experimental and numerical results from a 1.6 m trimaran model \u0000tested in various head seas conditions. The results suggest that CFD offers a reliable method for predicting pitch \u0000and heave motions of trimarans in regular head waves when compared to traditional Strip Theory methods. \u0000Unlike strip theory, the effect of breaking waves, hull shape above waterline and green seas are considered in \u0000CFD application. A wave resonance phenomenon was observed and Wave deformation as a result of wave-current-wind interaction in CFD was identified as the main source of discrepancy. The results from this work \u0000form the basis for future analysis of trimaran motions in oblique seas for developing a better understanding of \u0000the parameters influencing the seakeeping response, as well as passenger comfort.","PeriodicalId":108988,"journal":{"name":"Royal Institution of Naval Architects Transactions","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130917408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Preparing a wave adaptive modular vessel for automation 准备一种自动化的波浪自适应模块化船

Royal Institution of Naval Architects Transactions Pub Date : 1900-01-01 DOI: 10.3940/RINA.IJSCT.2016.B2.190TN

Keane, J. Duffy, M. Haase, S. Randeni, Hr Hubbert, Rl Kent, A. Forrest, K. Sammut, A. Lammas, J. Wheare, D. Battle

{"title":"Preparing a wave adaptive modular vessel for automation","authors":"Keane, J. Duffy, M. Haase, S. Randeni, Hr Hubbert, Rl Kent, A. Forrest, K. Sammut, A. Lammas, J. Wheare, D. Battle","doi":"10.3940/RINA.IJSCT.2016.B2.190TN","DOIUrl":"https://doi.org/10.3940/RINA.IJSCT.2016.B2.190TN","url":null,"abstract":"The ride control systems of high-speed vessels frequently use active stern tabs for both motion control and maintenance of correct trim at various speeds and sea conditions. This paper investigates the effect of water depth on the lift force provided by stern mounted trim tabs, of the type fitted to INCAT high speed wave-piercer catamaran vehicle ferries and similar vessels. This investigation was carried out at model scale with the use of a test apparatus in a flume tank in the University of Tasmania hydraulics laboratory. The lift force magnitude and location were measured over a range of tab angles and flow depths. This was used to calculate the lift coefficient of the tab and asses the performance of the tab over the range of flow depths. It was found that the lift force increased and the force location progressed further forward of the hinge as flow depth decreased. The lift curve slope of the stern tab increased by a factor of over 3 relative to the deep water value when the water depth below the hull was approximately equal to the tab chord. The deep water lift curve slope appears to be approached only when the water depth exceeded 4 or more tab chord lengths. The centre of pressure of the lift force was more than two chord lengths ahead of the tab hinge, showing that most of the lift produced by the tab was under the hull rather than on the surface of the tab itself.","PeriodicalId":108988,"journal":{"name":"Royal Institution of Naval Architects Transactions","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117046747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Capsizing of Small Vessels in Breaking Waves 小船在破浪中倾覆

Royal Institution of Naval Architects Transactions Pub Date : 1900-01-01 DOI: 10.3940/RINA.IJSCT.2004.B2.31041

Renilson, P. Hardon, W. Al-Nassar, Ka Al-Salem

引用次数: 0