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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 ArticleDOI
Akihiko Minato1, Ryuhei Kawabe1
TL;DR: In this paper, a numerical calculation technique for the two-dimensional two-fluid model has been developed, where the control volume formulation and non-staggered mesh scheme are employed in order to confirm that solutions satisfy the conservation equations of the model.
Abstract: A numerical calculation technique for the two-dimensional two-fluid model has been developed. The control volume formulation and non-staggered mesh scheme are employed in order to confirm that solutions satisfy the conservation equations of the two-fluid model. Numerical instability due to the non-staggered mesh is overcome by considering additional flows induced from a local pressure gradient on control volume boundaries. The Godunov method and SIMPLE method are used to estimate the additional flow for compressible and incompressible two-phase flows, respectively. These methods are modified to take the density difference between the phases and the added mass effect into account. The present method has been applied to analyses of two-dimensional two-phase flow discharge from a pipe and phase separation due to gravity in a horizontal circular pipe in order to investigate the capability of dealing with fundamental phenomena of two-dimensional two-phase flow. The present technique enables a small scale compu...

15 citations

19 Mar 1976
TL;DR: In this article, a series of experiments were performed to determine the fluid added mass and damping forces on harmonically oscillating cylinders in still water, and the added mass was found to be independent of amplitude and well represented by linear theory for the experimental conditions.
Abstract: A series of experiments was performed to determine the fluid added mass and damping forces on harmonically oscillating cylinders in still water. The forces obtained in this case are simply related to the forces which would occur if the cylinder was stationary and the fluid oscillated with the same amplitude and frequency. Hence, the results have direct bearing on the calculation of wave forces on cylindrical structures. Primary attention is given to low amplitude motions where it is found that the fluid damping force is purely viscous (proportional to the velocity). Beyond an oscillation amplitude of 0.4 dia, the damping becomes proportional to velocity squared in agreement with previous investigations and common assumption. The added mass is found to be independent of amplitude and well represented by linear theory for the experimental conditions.

15 citations

Proceedings ArticleDOI
04 Sep 2008
TL;DR: In this article, a 3D frame-membrane structure covered with regolith shielding and pressurized internally has been proposed as a possible lunar habitat, where the impact load is considered arising from a moving object/debris/projectile hitting a membrane panel of the structure.
Abstract: A three-dimensional (3-D) frame-membrane structure covered with regolith shielding and pressurized internally has been proposed as a possible lunar habitat. This paper presents results from the dynamic impact analysis of the structure using nonlinear (large deformation) finite element technique. Results are presented taking into account the effect of the added mass of regolith and stress stiffening due to applied internal pressurization load. The impact load is considered arising from a moving object/debris/projectile hitting a membrane panel of the structure. The results show that both pressurization and added mass affect the displacement and stress response of the structure under the impact load. At the membrane node, the internal pressurization (prestressing) has greater effects to reduce the amplitude of oscillation of the vertical displacement in the case of without the added regolith mass than that in the case of with the added regolith mass. However, for the frame member nodes, when there was no added mass of regolith the amplitude of displacement seem to reduce slightly or remain the same due to pressurization. However, the effect due to pressurization is observed to be just the opposite (i.e. the displacement amplitude increased) when there was added mass of regolith.

15 citations

Journal ArticleDOI
TL;DR: In this article, an extended Wagner's model is combined with the hydroelastic model, and a hybrid model is developed to simulate the fluid-structure interaction in water entry problems using partitioned approach.
Abstract: A hydroelastic hybrid model is developed to simulate the fluid–structure interaction in water entry problems using the partitioned approach. The interactions between a flat plate and the water are modeled by a hydroelastic model using explicit and implicit couplings. Both couplings are unstable due to numerical instability associated with the fluid added mass. To overcome the instability, an extended Wagner’s model is combined with the hydroelastic model, and a hybrid model is developed. The extended Wagner’s model is the extension of the classical Wagner’s model that is used to estimate the fluid inertial, damping, and restoring forces of a flexible plate within the potential flow theory. The fluid flow is described by the unsteady Reynolds averaged Navier–Stokes equations in the hydroelastic model and hybrid model. The longitudinal bending of the plate is approximated by the strips in all models. The hybrid model is verified and validated by comparing the available computational and semi-analytical results of the vertical and oblique water entries for the plate with different boundary conditions. The results show that the hybrid model is stable, accurate, and simple to implement. This two-dimensional model can be generalized to the third dimension and applied for more complex structures.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the deterministic and random vibration response analysis of a model which simulates a robotic arm has been presented, where the model is considered as a uniform, mass-loaded, hysteretically damped beam, the left end attached by both translational and rotational springs and the right end of which is free and carrying a heavy tip mass.

15 citations


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