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| Prevosto, Marc; Soulard, Thomas. |
| When Newman's approximation is used to calculate the low frequency part of the nonlinear transfer between the waves and the forces on an LNG carrier, the CPU time to make the time series reconstruction of wave loads is a small part of the total. However, using full QTF-matrices increases the required work by a factor equal to the number of wave components in the sea states and the total simulation time can be increased by 5 or 10. Moreover, if we consider the multi-directional sea, the double summation becomes a quadruple summation at second order which is extremely time-consuming. There is a way to accelerate this computation by making an algebraic or system approximation of the QTF. The aim of this report is to present the solutions, the problems and the... |
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| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00239/34986/33520.pdf |
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| Marty, Antoine; Berhault, Christian; Damblans, Guillaume; Facq, Jean-valery; Gaurier, Benoit; Germain, Gregory; Soulard, Thomas; Schoefs, Franck. |
| This document describes the experimental set-up of OMDYN2 and LEHERO-MG projects. The study aims to quantify the impact of biofouling on the dynamic behaviour of an underwater power cable by analysing the hydrodynamic coefficients, such as drag and added mass coefficients. Experiments have been carried out in the wave and current basin of IFREMER, located at Boulogne-sur-mer, in order to compare the dynamics of several cylinders with or without roughness. Three cylinders are tested, two cylinders with different roughnesses and one smooth cylinder. The studied roughnesses concern realistic marine growth and have therefore significantly bigger dimensions (like mussels) than roughness studied in the research literature on the subject. Tests are conducted... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00660/77245/78697.pdf |
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