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, the effects of a tuned added mass on the aeroelastic stability of a single degree of freedom bluff body exposed to a steady flow are investigated, and the model captures the essential aspects of the behaviour of flexible structures equipped with Tuned Mass Dampers undergoing galloping oscillations.
40 citations
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TL;DR: In this paper, the authors investigated the influence of solid-to-fluid added mass ratio (μb) and viscous effects on the fluid-structure interaction (FSI) response and stability of a flapping foil in incompressible and turbulent flows using a recently presented efficient and stable numerical algorithm in time-domain, which couples an unsteady Reynolds Average Navier-Stokes solver with a two degrees-of-freedom structural model.
Abstract: It is important to understand and accurately predict the static and dynamic response and stability of flexible hydro/aero lifting bodies to ensure their structural safety, to facilitate the design/optimization of new/existing concepts, and to test the feasibility of using advanced materials The present study investigates the influence of solid-to-fluid added mass ratio (μb) and viscous effects on the fluid-structure interaction (FSI) response and stability of a flapping foil in incompressible and turbulent flows using a recently presented efficient and stable numerical algorithm in time-domain, which couples an unsteady Reynolds Average Navier-Stokes solver with a two degrees-of freedom structural model The new numerical coupling method is able to stably and accurately simulate the FSI behavior of light foils in dense fluids: a limit which is known to be numerically difficult to study with classical FSI coupling methods The studied FSI responses include static/dynamic divergence and flutter instabilities, which are compared with inviscid, linear potential theory predictions obtained with both time and frequency domain formulations, as well as with several published experimental data In general, the results show that the critical reduced flutter velocities and reduced divergence velocities both decrease as μb decreases, and are captured with good accuracy using the viscous FSI solver for a wide range of relative mass ratios that are typical to air/hydrofoils The comparative analyses showed that the classic frequency-domain linear potential theory is severely unconservative for predicting the flutter velocity for cases with μb 2), flutter tends to occur prior to divergence In addition, in between the regions governed by static divergence (μb 2), there is a dynamic divergence region, where the foil deformations oscillate with an increasing mean amplitude, and the oscillation frequency decreases toward zero as the deformation increases; this region could only be captured by using a viscous FSI solver
40 citations
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TL;DR: In this paper, a solution of the two-dimensional potential problem associated with harmonic oscillations of a twin-hull body in a free surface is presented, which can be used as a guidance to estimate the hydrodynamic characteristics of catamarans.
Abstract: This paper presents a solution of the two-dimensional potential problem associated with harmonic oscillations of a twin-hull body in a free surface. The body considered has two identical, rigidly connected, circular cylindrical hulls, semisubmerged, performing small vertical oscillations. Results of the added-mass and damping coefficients are presented as functions of the oscillation frequency. Data presented can be used as a guidance to estimate the hydrodynamic characteristics of catamarans.
40 citations
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TL;DR: In this paper, the vibrational behavior of a cracked cantilever beam carrying end mass and rotary inertia is investigated through the crack model and the values of the ratio between the cracked and uncracked beam natural frequencies, the frequency ratio, are examined and are shown to follow well-defined trends with respect to the crack parameters and end mass.
40 citations
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TL;DR: In this article, a model for the dynamic behavior of a deepwater drilling platform riser system under emergency evacuation conditions is developed, and the model is discretized in a finite element approach and solved using Newmark's method.
40 citations