TAILIEUCHUNG - Practical Ship Hydrodynamics Episode 6

Tham khảo tài liệu 'practical ship hydrodynamics episode 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Resistance and propulsion 91 double-body flow . Most computations especially those for practical design applications were limited to Reynolds numbers corresponding to model tests. Sometimes potential flow computations were used as preprocessors to determine trim and sinkage and the wave elevation before RANSE computations started with fixed boundaries. The basic techniques of RANSE codes have been discussed in section Chapter 1. Various applications to ship design and research applications are found in the literature. Representative for the state of the art for ship design applications are surveys by leading companies in the field such as Flowtech Larsson 1997 1998 or HSvA Bertram and Jensen 1994 Bertram 1998a . The state of the art in research is documented in validation workshops like the Tokyo 1994 workshop and the Gothenborg 2000 workshop. RANSE computations require considerable skill and experience in grid generation and should therefore as a rule be executed by experts usually found in special consulting companies or by using modern towing tanks. Problems for fast and unconventional ships Model testing has a long tradition for the prediction and optimization of ship performance of conventional ships. The scaling laws are well established and the procedures correlate model and ship with a high level of accuracy. The same scaling laws generally apply to high-speed craft but two fundamental problems may arise 1. Physical quantities may have major effects on the results which cannot be deduced from classical model tests. The physical quantities in this context are surface tension spray viscous forces and moments aerodynamic forces cavitation. 2. Limitations of the test facilities do not allow an optimum scale. The most important limitations are generally water depth and carriage speed. Fast and unconventional ships are often hybrid ships . they produce the necessary buoyancy by more than one of the three possible options buoyancy dynamic lift foils or

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