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 authors present a partitioned approach to fluid-structure interaction problems arising in analyses of blood flow in arteries, where the Aitken relaxation and variants of the interface quasi-Newton -least-squares method are applied to different test cases.
Abstract: We present a partitioned approach to fluid-structure interaction problems arising in analyses of blood flow in arteries. Several strategies to accelerate the convergence of the fixed-point iteration resulting from the coupling of the fluid and the structural sub-problem are investigated. The Aitken relaxation and variants of the interface quasi-Newton -least-squares method are applied to different test cases. A hybrid variant of two well-known variants of the interface quasi-Newton-least-squares method is found to perform best. The test cases cover the typical boundary value problem faced when simulating the fluid-structure interaction in arteries, including a strong added mass effect and a wet surface which accounts for a large part of the overall surface of each sub-problem. A rubber-like Neo Hookean material model and a soft-tissue-like Holzapfel-Gasser-Ogden material model are used to describe the artery wall and are compared in terms of stability and computational expenses. To avoid any kind of locking, high-order finite elements are used to discretize the structural sub-problem. The finite volume method is employed to discretize the fluid sub-problem. We investigate the influence of mass-proportional damping and the material model chosen for the artery on the performance and stability of the acceleration strategies as well as on the simulation results. To show the applicability of the partitioned approach to clinical relevant studies, the hemodynamics in a pathologically deformed artery are investigated, taking the findings of the test case simulations into account.
17 citations
TL;DR: In this article, a 2D+t theory is presented to perform nonlinear time domain simulations of a prismatic planing boat in incident waves and the added mass and damping coefficients used in the latter theory are determined from the numerical simulation of forced oscillations.
Abstract: The performance of planing vessels in waves is investigated numerically by assuming linear regular incident waves in head sea. A 2D+t theory is presented to perform nonlinear time domain simulations of a prismatic planing boat in incident waves. A Boundary Element Method is employed to solve the initial boundary value problems in two-dimensional (2D) cross-planes. A simplified theory is also applied. The added mass and damping coefficients used in the latter theory are determined from the numerical simulation of forced oscillations. The wave induced heave and pitch motions calculated by these two methods are compared with the experiments by Fridsma[1].
17 citations
01 Jan 2017
TL;DR: In this article, a shape-changing linear oscillator was used to investigate the added-mass recovery in a soft-bodied vehicle, and it was shown that a body immersed in a dense fluid which undergoes an abrupt change of its shape experiences a positive feedback on thrust.
Abstract: Aquatic organisms capable of undergoing extensive volume variation of their body during locomotion can benefit from increased thrust production. This is enabled by making use of not only the expulsion of mass from their body, as documented extensively in the study of pulsed-jet propulsion, but also from the recovery of kinetic energy via the variation of added mass. We use a simplified mechanical system, i.e. a shape-changing linear oscillator, to investigate the phenomenon of added-mass recovery. Our study proves that a deformable oscillator can be set in sustained resonance by exploiting the contribution from shape variation alone which, if appropriately modulated, can annihilate viscous drag. By confirming that a body immersed in a dense fluid which undergoes an abrupt change of its shape experiences a positive feedback on thrust, we prove that soft-bodied vehicles can be designed and actuated in such a way as to exploit their own body deformation to benefit of augmented propulsive forces.
17 citations
TL;DR: In this paper, the settling of solid particles within a viscous incompressible fluid contained in a two-dimensional channel is studied, where the mass density of the particles is slightly greater than that of the fluid.
Abstract: We study the settling of solid particles within a viscous incompressible fluid contained in a two-dimensional channel, where the mass density of the particles is slightly greater than that of the fluid. The fluid-structure interaction problem is simulated numerically using the immersed boundary method, with an added mass term that is incorporated using a Boussinesq approximation. Simulations are performed with a single circular particle, and also with two particles in various initial configurations. The terminal settling velocities for the particles correspond closely with both theoretical and experimental results, and the single-particle dynamics reproduce expected behavior qualitatively. The two-particle simulations exhibit drafting-kissing-tumbling dynamics that is similar to what is observed in other experimental and numerical studies.
17 citations
01 Jan 1976
TL;DR: Forced oscillation experiments were carried out with a systematic ship model family of which the length-beam ratio ranged from 4 to 20 as mentioned in this paper, and the experiments also included a thin plate to simulate the case of an infinite lengthbeam ratio.
Abstract: Forced oscillation experiments were carried out with a systematic ship model family of which the length-beam ratio ranged from 4 to 20. The experiments also included a thin plate to simulate the case of an infinite length-beam ratio. Vertical and horizontal harmonic motions in calm water were considered and the corresponding hydrodynamic coefficients were determined. Moreover the vertical motions and added resistance in waves were measured. The results are presented in graphical form and are compared with some existing calculation methods.
17 citations