scholarly journals Verification of a theoretical model of tensor skin under water impact by considering the fluid–structure interaction

2016 ◽  
Vol 92 ◽  
pp. 66-74 ◽  
Author(s):  
YanTing Ren ◽  
XinMing Qiu ◽  
T.X. Yu
Keyword(s):  
Theoretical Model ◽  
Fluid Structure Interaction ◽  
Water Impact ◽  
Fluid Structure ◽  
Structure Interaction

Nanoscale Fluid-Structure Interactions in Cytoplasm During Freezing

2012 ◽  
Author(s):  
Altug Ozcelikkale ◽  
Bumsoo Han
Keyword(s):  
Theoretical Model ◽  
Physical Properties ◽  
Spatial Heterogeneity ◽  
Fluid Structure Interaction ◽  
Fluid Structure Interactions ◽  
Spatial Homogeneity ◽  
Intracellular Space ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Poroelastic Material

In this study, a theoretical model is developed to simulate the biophysical events in the intracellular spaces considering the biphasic, i.e., poroelastic, behavior of the cytoplasm. Most previous studies in the cryobiology literature have modeled the biophysical response of cells to freezing assuming the spatial homogeneity of all physical properties within the intracellular space without considering fluid-structure interaction in both the intracellular and extracellular spaces. However, a few recent studies strongly indicate that spatial heterogeneity in the intracellular space occurs during freezing. We thus model the cytoplasm as a poroelastic material considering nanoscale fluid-structure interaction between the cytoskeleton and cytosol, and the effects of hierarchical fluid-structure interaction across the cell during freezing.

Multiphysics Study of Structural Impact to Fluidic Media

2011 ◽  
Vol 673 ◽  
pp. 1-10 ◽  
Author(s):  
Matej Vesenjak ◽  
Zoran Ren ◽  
Mojtaba Moatamedi
Keyword(s):  
Impact Loading ◽  
Numerical Study ◽  
Fluid Structure Interaction ◽  
Water Impact ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Particle Hydrodynamics ◽  
Ale Methods ◽  
Smoothed Particle ◽  
Space Capsule

The paper presents a fluid structure interaction based numerical study of impact loading for a hemispherical structure upon water and a space capsule water landing. The study has a strong relevance in the determination of the crashworthiness of aerospace structures upon water impact loading. Finite element based numerical techniques have been used for the analysis of the underlying transient dynamic and fluid-structure interaction. Smoothed Particle Hydrodynamics (SPH) and Arbitrary Lagrange-Eulerian (ALE) methods have been used to simulate the behaviour of the fluid (water) under impact conditions. The accelerations and velocities of the impacting objects have been validated with by experimental measurements and analytical results. Numerical analyses showed a strong potential for the use of developed computational fluid structure interaction models for analyses of water impact loading related problems.

scholarly journals Wave Propagation Across Solid-Fluid Interface With Fluid-Structure Interaction

2015 ◽  
Author(s):  
Tomohisa Kojima ◽  
Kazuaki Inaba ◽  
Kosuke Takahashi
Keyword(s):  
Wave Propagation ◽  
Theoretical Model ◽  
Characteristic Impedance ◽  
Fluid Structure Interaction ◽  
Fluid Interface ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Mechanism Of Wave Propagation ◽  
Free Falling ◽  
The Impact

This paper reports on investigations conducted with a view towards developing a theoretical model for wave propagation across solid-fluid interfaces with fluid-structure interaction. Although many studies have been conducted, the mechanism of wave propagation close to the solid-fluid interface remains unclear. Consequently, our aim is to clarify the mechanism of wave propagation across the solid-fluid interface with fluid-structure interaction and develop a theoretical model to explain this phenomenon. In experiments conducted to develop the theory, a free-falling steel projectile is used to impact the top of a solid buffer placed immediately above the surface of water within a polycarbonate tube. The stress waves created as a result of the impact of the projectile propagated through the buffer and reached the interface of the buffer and water (fluid) in the tube. Two different buffers (polycarbonate and aluminum) were used to examine the interaction effects. The results of the experiments indicated that the amplitude of the interface pressure increased in accordance with the characteristic impedance of the solid medium. This cannot be explained by the classical theory of wave reflection and transmission. Thus, it is clear that on the solid-fluid interface with fluid-structure interaction, classical theories alone cannot precisely predict the generated pressure.

scholarly journals Fluid Structure Interaction of Buoyant Bodies with Free Surface Flows: Computational Modelling and Experimental Validation

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 1048 ◽  
Author(s):  
Andrea Luigi Facci ◽  
Giacomo Falcucci ◽  
Antonio Agresta ◽  
Chiara Biscarini ◽  
Elio Jannelli ◽  
...  
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Fluid Structure Interaction ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Water Impact ◽  
Ocean Engineering ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Wide Range

In this paper we present a computational model for the fluid structure interaction of a buoyant rigid body immersed in a free surface flow. The presence of a free surface and its interaction with buoyant bodies make the problem very challenging. In fact, with light (compared to the fluid) or very flexible structures, fluid forces generate large displacements or accelerations of the solid and this enhances the artificial added mass effect. Such a problem is relevant in particular in naval and ocean engineering and for wave energy harvesting, where a correct prediction of the hydrodynamic loading exerted by the fluid on buoyant structures is crucial. To this aim, we develop and validate a tightly coupled algorithm that is able to deal with large structural displacement and impulsive acceleration typical, for instance, of water entry problems. The free surface flow is modeled through the volume of fluid model, the finite volume method is utilized is to discretize the flow and solid motion is described by the Newton-Euler equations. Fluid structure interaction is modeled through a Dirichlet-Newmann partitioned approach and tight coupling is achieved by utilizing a fixed-point iterative procedure. As most experimental data available in literature are limited to the first instants after the water impact, for larger hydrodynamic forces, we specifically designed a set of dedicated experiments on the water impact of a buoyant cylinder, to validate the proposed methodology in a more general framework. Finally, to demonstrate that the proposed numerical model could be used for a wide range of engineering problems related to FSI in multiphase flows, we tested the proposed numerical model for the simulation of a floating body.

Fluid-Structure Interaction Modeling by ALE and SPH

2013 ◽  
Vol 275-277 ◽  
pp. 393-397 ◽  
Author(s):  
Bao Dong Guo ◽  
Qiu Lin Qu ◽  
Jia Li Wu ◽  
Pei Qing Liu
Keyword(s):  
Critical Role ◽  
Fluid Structure Interaction ◽  
Numerical Results ◽  
Water Impact ◽  
Fluid Structure ◽  
Particle Spacing ◽  
Structure Interaction ◽  
Water Region ◽  
Interaction Modeling ◽  
Theoretical Results

The outcomes of a research focusing on water modeling and Fluid-Structure Interaction by ALE and SPH in LSTC/LS-Dyna971 are presented in this paper. Firstly the water impact behaviors of a rigid wedge are modeled with water region by ALE and SPH. The size of fluid elements plays critical role to the numerical results, so three different cases varied in mesh or particle spacing both in ALE and SPH methods are detailed discussed. The numerical results are compared both one to the others and to the experimental and theoretical results in terms of vertical velocity and slamming force, which can be concluded that the more elements modeled in the simulation, the better approximation with the experiment results. An additional discussion of propagation of pressure wave by SPH and CPU time are also presented.

Dynamics of Wave Propagation Across Solid–Fluid Movable Interface in Fluid–Structure Interaction

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Tomohisa Kojima ◽  
Kazuaki Inaba ◽  
Kosuke Takahashi ◽  
Farid Triawan ◽  
Kikuo Kishimoto
Keyword(s):  
Wave Propagation ◽  
Theoretical Model ◽  
Fluid Structure Interaction ◽  
Momentum Conservation ◽  
Local Deformation ◽  
Fluid Interfaces ◽  
Interface Pressure ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Mechanism Of Wave Propagation

A theoretical model for wave propagation across solid–fluid interfaces with fluid–structure interaction (FSI) was explored by conducting experiments. Although many studies have been conducted on solid–solid and fluid–fluid interfaces, the mechanism of wave propagation across solid–fluid interfaces has not been well examined. Consequently, our aim is to clarify the mechanism of wave propagation across a solid–fluid interface with the movement of the interface and develop a theoretical model to explain this phenomenon. In the experiments conducted, a free-falling steel projectile was used to impact a solid buffer placed immediately above the surface of water within a polycarbonate (PC) tube. Two different buffers (aluminum and polycarbonate) were used to examine the relation between wave propagation across the interface of the buffer and water and the interface movement. With the experimental results, we confirmed that the peak value of the interface pressure can be predicted via acoustic theory based on the assumption that projectile and buffer behave as an elastic body with local deformation by wave propagation. On the other hand, it was revealed that the average profile of the interface pressure can be predicted with the momentum conservation between the projectile and the buffer assumed to be rigid and momentum increase of fluid. The momentum transmitted to the fluid gradually increases as the wave propagates and causes a gradual decrease in the interface pressure. The amount of momentum was estimated via the wave speed in the fluid-filled tube by taking into account the coupling of the fluid and the tube.

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