We have developed a new numerical scheme that combines a Eulerian scheme with Lagrangian particles to compute fluid-structure interaction caused by impact pressure. The proposed numerical model was applied to several problems such as interaction between a solid structure with dam breaking, and hydroelastic due to impact pressure acting on a vertical wall. The Lagrangian particles are useful and available to capture an interface between different phases. The model can estimate impact pressure acting on a vertical wall, its deformation, vibration, stress and strain. We made clear three dimensional impact pressure field of solid structure in space and time and advantageous effect of artificial stress term.
A small saury fishing vessel (19GT-type) is newly developed and evaluated the total performance in order to increase profits and to attract the younger generation of fishermen. On the basis of inquiring surveys to fisheries unions, shipowners and shipbuilders, problems and needs of saury fishing vessels are analyzed. Then, the performance of conventional fishing vessels is evaluated through model resistance tests in a circulating water channel. The hull form design for the fore-body is improved by the use of wave-making resistance theory. The aft-body is improved by the use of the Eulerian scheme with the Lagrangian particles. The general arrangement of the hull form improved vessel is developed to upgrade the habitability and fishing performance. The newly developed and advanced small saury fishing vessel can reduce the fuel consumption by half compared to the conventional vessels. An actual 19 GT saury fishing vessel, constructed based on the results of this study by using the present design method, demonstrates the superiority of performance.
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