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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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Journal Article
TL;DR: Based on CFD theory, a method including both numerical simulation and analysis for ship added mass and damping was outlined for ship oscillating in waves as discussed by the authors, which agree well with the corresponding ones of potential theory.
Abstract: The computation of ship added mass and damping is crucial to accurately predict ship motion in wavesBased on CFD theory,a method including both numerical simulation and analysis for ship added mass and damping was outlined for ship oscillating in wavesThe computational results of added mass and damping coefficients of ship sections were obtained which agree well with the corresponding ones of potential theoryIt is of great significance to further analyze and predict ship motion in waves

15 citations

Proceedings ArticleDOI
01 Jan 2009
TL;DR: In this article, the authors used the Large Eddy Simulation (LES) technique to compute the instantaneous pressure and velocity fields inside the fluid as well as the shear stress and the pressure along the walls.
Abstract: Turbulent-induced vibrations of fuel assemblies in PWR power plants is a potential cause of deformation and of fretting wear damage. Because of the complexity of a 17 × 17 rod assembly with a length exceeding four meters, the prediction of its vibrations is still a challenging task as regards computer simulation. The Large Eddy Simulation (LES) technique provides the instantaneous pressure and velocity fields inside the fluid as well as the shear stress and the pressure along the walls. EDF inhouse open source CFD tool Code_Saturne is used in the present work with a 8 million cells grid to compute the flow along four sub-channels all around one fuel rod by taking into account only one mixing grid. The computations are carried out on 1024 processors of a BlueGene/L supercomputer. Hence, the overall turbulent excitation upon one single rod is estimated numerically, taking into account the specific influence of the deflectors. As regards the structure, using the forces provided by the CFD computation, a linear model of the rod based on Euler beam theory and simplified boundary conditions is proposed. The first natural modes of the structure are hence obtained, and the modal forces are estimated using the standard techniques of modal projection and joint acceptance. Estimations of the vibration amplitude of rod induced by the local flow are finally obtained, using simplified expressions of the added mass and of the damping coefficient. The amplitudes are significant for the first mode essentially, and reach a value of the order of the μm, with a maximum around 6 μm.Copyright © 2009 by ASME

15 citations

Journal ArticleDOI
TL;DR: In this article, the added mass of an array of discs spaced at regular intervals along the pipe is computed, and is related to the pressure gradient along the manifold of the pipe, and the results show that added mass per particle increases as the pipe diameter is reduced relative to the particle size.
Abstract: The flow of inviscid fluid around a disc in a pipe is computed, and the results are used to determine the added mass of the accelerating disc in the frame in which the mixture velocity is zero. The added mass of an array of discs spaced at regular intervals along the pipe is then computed, and is related to the pressure gradient along the pipe. Some flow profiles are also presented. The results show that the added mass per particle increases as the pipe diameter is reduced relative to the particle size. The added mass per particle decreases as the number density of particles increases, but the added mass per unit length of the pipe nevertheless increases. Thus an increase of either the particle size or number density leads to a tighter coupling between the liquid and the particles; this result should hold for other particle shapes and configurations. Results are also presented for the drift, i.e., the displacement of fluid particles caused by the motion of an isolated disc along the axis of the pipe. If the diameter of the pipe is sufficiently small, the added mass of the disc is modified from that in unbounded fluid, and the background drift at the walls of the pipe can no longer be estimated from the added mass of the disc.

15 citations

Journal ArticleDOI
TL;DR: In this paper, a finite element method is used to obtain values of the drag and virtual mass coefficients for face-centered cubic granular materials with three different porosities and compare their numerical results to Biot's analytical solutions.
Abstract: The Biot theory for the acoustics of porous media contains drag and virtual mass coefficients that depend on the physical properties of the fluid and solid constituents, the frequency, and the microstructure of the porous medium. Biot derived an equation for the drag coefficient as a function of frequency by assuming cylindrical pores. In this paper, the finite element method is used to obtain values of the drag and virtual mass coefficients for face‐centered cubic granular materials with three different porosities and compare our numerical results to Biot’s analytical solutions. By making appropriate choices of three parameters in Biot’s analytical solution for cylindrical pores—the pore size parameter, the Kozeny parameter, and the tortuosity—the analytical solution matches these numerical results very well. This suggests that with appropriate choices of these parameters the analytical approach can predict the dependence of the drag and virtual mass coefficients on frequency for an arbitrary pore geometry. These results support a relation suggested by Hovem and Ingram for approximating the pore‐size parameter for spherical grains, and they also agree with a relation suggested by Berryman for the dependence of the tortuosity on the porosity.

15 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202351
2022133
2021111
2020116
2019129
2018124