Reporter: OddM. Faltinsen, Academician of Norwegian Academy of Sciences, Foreign academician of Chinese Academy of Engineering, foreign academician of American Academy of Engineering

Report topic:Slamming load effects on ships and marine structures

Lecture time: 14:00-15:00, September 11,2023 (Monday)

Lecture place: Conference Room 1013, Ship Marine Building (offline)

Brief introduction of the speaker

OddM. Faltinsen is a professor of the Department of Marine Technology at the Norwegian University of Science and Technology (NTNU), an academician of the Norwegian Academy of Sciences, a foreign academician of the Chinese Academy of Engineering, and a foreign academician of the American Academy of Engineering. Faltinsen Professor He has made outstanding academic contributions in many academic directions, such as single ship hydrodynamics, high-speed ship hydrodynamics, Marine platform hydrodynamics, Marine pasture hydrodynamics, liquid tank swinging, water elasticity, etc. He has published three English academic monographs, Sea loads on Ships and Offshore Structures, Hydrodynamics of High-Speed Marine Vehicles and Sloshing, and published nearly 500 scientific and technological papers.

Lecture summary

Slamming is of concern for structural design of ships, offshore platforms, lowering of subsea structures through the splash zone, accidentally dropped objects and launching of free-fall lifeboats from offshore platforms. Slamming on ships and sea structures causes both local and global structural response and ought to be coupled with structural mechanics to find important time scales of the many physical effects associated with slamming. Hydroelastic slamming has analogy to transient response of a mass-spring system. Important factors are the ratio between slamming duration and important structural natural periods, the time history of loading, added mass and slam damping. If the time scale of a fluid mechanic effect such as liquid compressibility or gas cavity oscillations is very small relative to the structural natural periods associated with maximum structural stress, the details of the fluid mechanic effect does not matter. Hydroelasticity of concrete shells, horizontal plates and wedge-shaped cross-sections during drop tests are theoretically discussed and partly compared with experiments. Both the water-entry and water-exit phase matter in describing the global load effect due to wetdeck slamming on catamarans and offshore platforms. Bow slamming and whipping of ships are discussed with emphasis on modelling of slamming in an engineering context. Sloshing-induced slamming in prismatic LNG tanks is perhaps the most complicated slamming problem because many fluid-mechanic and thermodynamic parameters as well as hydroelasticity may matter. Further, complicated in-flow scenarios of slamming may appear due to violent sloshing. The consequence is that both computational tools and model test scaling are limited.

host unit:

The Secretariat of the Science and Technology Association of Harbin Engineering University

Research Institute of Science and Technology of Harbin Engineering University

organizer:

The National International Joint Research Center of Shipbuilding and Marine Engineering Mechanics, School of Shipbuilding Engineering, Harbin Engineering University

Joint laboratory of international cooperation between Ship and Marine Engineering and Technology

Key Laboratory of Advanced Ship Materials and Mechanics Ministry of Ministry of Industry and Information Technology

Ship Structure Impact dynamics Laboratory, Heilongjiang Provincial Key Laboratory

Heilongjiang Provincial Key Laboratory of Marine Science and Technology

Talent and Education Academic Committee of China Shipbuilding and Engineering Society

Heilongjiang Provincial Shipbuilding and Engineering Society