Topic
Added mass
About: Added mass is a research topic. Over the lifetime, 2849 publications have been published within this topic receiving 47899 citations.
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TL;DR: In this article, a time domain Rankine source method incorporated with HOBEM is developed and applied to solve motion of ship advancing with steady forward speed in waves, and the results of added mass, damping coefficients, wave exciting forces and ship motions are in generally good agreement with related model tests data.
14 citations
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TL;DR: A one-way coupling Euler-Lagrange approach is used and the two-dimensional axi-symmetric results are in good agreement with experimentally observed structure of bubbles close to sonotrode.
14 citations
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TL;DR: In this paper, a series of underwater shaking table tests are conducted in the air and in water, and the dynamic characteristics affected by hydrodynamic pressure are discussed and the distribution of hyddynamic pressure is also analyzed.
Abstract: The fluid-structure interaction under seismic excitation is very complicated, and thus the damage identification of the bridge in deep water is the key technique to ensure the safe service. Based on nonlinear Morison equation considering the added mass effect and the fluid-structure interaction effect, the effect of hydrodynamic pressure on the structure is analyzed. A series of underwater shaking table tests are conducted in the air and in water. The dynamic characteristics affected by hydrodynamic pressure are discussed and the distribution of hydrodynamic pressure is also analyzed. In addition, the damage of structure is distinguished through the natural frequency and the difference of modal curvature, and is then compared with the test results. The numerical simulation and test of this study indicate that the effect of hydrodynamic pressure on the structure should not be neglected. It is also found that the presence of the damage, the location of the damage and the degree of the severity can be judged through the variation of structure frequency and the difference of modal curvature.
14 citations
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TL;DR: In this paper, an experiment was performed to investigate the fluid-structure-coupled dynamic characteristics of the under-water hexagonal fuel assemblies used in a fast reactor.
14 citations
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01 Jan 2010TL;DR: In this article, the effect of sloshing on the ship motion in oblique seas is quantified using a linear diffraction method and a time-domain simulation of the ship motions based on linear potential flow.
Abstract: Ships with partially filled liquid tanks, such as LNG carriers or FPSOs, are sensitive to sloshing in case they are exposed to waves. The effect of sloshing can have a pronounced effect on the ship motions, in particular roll in oblique seas. In this paper several methods are described which can be used to quantify this effect. The first is a linear diffraction method in which the effect of the liquid in the tank is modeled as a solid inertia of the fluid mass, an added mass and damping of the sloshing fluid and a hydrostatic free-surface correction to the GM. The response is easily computed in the frequency domain. The second is a time domain method in which the sloshing liquid in the tank is modeled with the CFD code ComFLOW. The forces exerted by the liquid on the tank walls are included in a time-domain simulation of the ship motions, based on linear potential flow for the outer domain (ship hull and ocean). The computed ship motions are again input for the motions of the liquid tank, generating a 2-way coupling between the dynamics of the tank and the ship. Both methods are applied to sloshing model tests, published by Molin (2008). In these tests, the response of a barge was measured with a completely filled and partially filled tank in beam seas. The results of the linear diffraction method agree reasonably well, but some differences in the roll response near the first sloshing mode are observed. The coupled time-domain method gives very good results for both low and high sea states.Copyright © 2010 by ASME
14 citations