Permanent fluid–structure interaction with non-conforming interfaces in fast transient dynamics

Casadei, Folco; Потапов, С.

doi:10.1016/j.cma.2003.06.002

Cited by 34 publications

(19 citation statements)

References 7 publications

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“…If the fragments do not perforate the plate or the blast wave reaches the plate before or simultaneously as the fragments, the total load will be equal to the sum of the contributions from the blast wave and the fragment impact [28]. The diaphragm is melted along its circumference, and the nozzle outlet is open so that 12 PP  . III: A net load is created on the test specimen because the pressurized air evacuates quicker through the nozzle outlet than through the holes in the test specimen.…”

Section: Discussionmentioning

confidence: 99%

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Transient pressure loading of clamped metallic plates with pre-formed holes

Rakvåg

Underwood

Schleyer

et al. 2013

International Journal of Impact Engineering

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The combined effect of blast and impact loading against protective structures is still not fully understood. In this paper, the motivation is to investigate the combined effect of pressure and fragment loading on steel plates. To simplify the approach, it is assumed that the fragments strike and perforate the flexible target before the pressure load arrives. These perforations are idealized as pre-formed holes of generalized shapes in thin, ductile Docol 600DL steel plates, which are then subjected to controlled pressure pulses in the laboratory. The tests were carried out in a Pulse Pressure Loading Rig, and two different pressure levels were applied for each plate design. After the tests, the deflections caused by the pressure pulses were measured. Even though the plates were much deformed in some of the tests, no sign of failure was observed. Based on a number of material tests, the parameters in the modified Johnson-Cook constitutive relation were identified. Several sets of non-linear finite element simulations of the pressure loading process were then conducted. The agreement between standard Lagrangian simulations and the experimental results was in general good, but the simulations failed to give an accurate description of the deflection around the pre-formed holes. Fully coupled FSI simulations of the experimental tests were then carried out and these simulations demonstrate significant spatial variation of the pressure load. The FSI simulations also showed that this spatial variation of the pressure load influence the deflection profile, especially in the vicinity of the holes.

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Section: Discussionmentioning

confidence: 99%

“…[10] and [11]). Casadei and Potapov [12] published a review of various FSI algorithms for (Arbitrary) LagrangianEulerian analyses. Methods like these allow for analysis of confined explosions in arbitrary geometries such as train carriages inside tunnels [13].…”

Section: Introductionmentioning

confidence: 99%

Transient pressure loading of clamped metallic plates with pre-formed holes

Rakvåg

Underwood

Schleyer

et al. 2013

International Journal of Impact Engineering

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“…On the contrary, in non-conforming mesh methods the interface and the related conditions are treated as constraints imposed on the model equations so that the fluid and solid equations can be solved independently from each other with their respective grids [21]. This represents an important advantage because, typically, the mesh used for the fluid has an average size lower than the one used for the solid and so it is not necessary to refine the solid finite element grid near to the interface.…”

Section: Algorithms For Fsi Problemsmentioning

confidence: 99%

Unified Lagrangian Formulation for Fluid and Solid Mechanics, Fluid-Structure Interaction and Coupled Thermal Problems Using the PFEM

Franci

2017

Springer Theses

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The objective of this work is the derivation and implementation of a unified Finite Element formulation for the solution of fluid and solid mechanics, Fluid-Structure Interaction (FSI) and coupled thermal problems.The unified procedure is based on a stabilized velocity-pressure Lagrangian formulation.Each time step increment is solved using a two-step Gauss-Seidel scheme: first the linear momentum equations are solved for the velocity increments, next the continuity equation is solved for the pressure in the updated configuration.The Particle Finite Element Method (PFEM) is used for the fluid domains, while the Finite Element Method (FEM) is employed for the solid ones. As a consequence, the domain is remeshed only in the parts occupied by the fluid.Linear shape functions are used for both the velocity and the pressure fields. In order to deal with the incompressibility of the materials, the formulation has been stabilized using an updated version of the Finite Calculus (FIC) method. The procedure has been derived for quasi-incompressible Newtonian fluids. In this work, the FIC stabilization procedure has been extended also to the analysis of quasi-incompressible hypoelastic solids.Specific attention has been given to the study of free surface flow problems. In particular, the mass preservation feature of the PFEM-FIC stabilized procedure has been deeply studied with the help of several numerical examples. Furthermore, the conditioning of the problem has been analyzed in detail describing the effect of the bulk modulus on the numerical scheme. A strategy based on the use of a pseudo bulk modulus for improving the conditioning of the linear system is also presented.The unified formulation has been validated by comparing its numerical results to experimental tests and other numerical solutions for fluid and solid mechanics, and FSI problems. The convergence of the scheme has been also analyzed for most of the problems presented.The unified formulation has been coupled with the heat tranfer problem using a staggered scheme. A simple algorithm for simulating phase change problems is also described. The numerical solution of several FSI problems involving the temperature is given.The thermal coupled scheme has been used successfully for the solution of an industrial problem. The objective of study was to analyze the damage of a nuclear power plant pressure vessel induced by a high viscous fluid at high temperature, the corium. The numerical study of this industrial problem has been included in this work.ii ResumenEl objectivo del presente trabajo es la derivación e implementación de una formulación unificada con elementos finitos para la solución de problemas de mecánica de fluidos y de sólidos, interacción fluido-estructura (Fluid-Structure Interaction (FSI)) y con acoplamiento térmico.El método unificado está basado en una formulación Lagrangiana estabilizada y las variables incçognitas son las velocidades y la presión. Cada paso de tiempo se soluciona a través de un esquema de dos pasos de tipo Gauss-Seide...

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“…It works with conforming as well as non-conforming [33] fluid-structure meshes. According to the FSA algorithm (and restricting ourselves to the conforming case for simplicity), any fluid node F on the F-S interface (see Fig.…”

Section: Ale Approachmentioning

confidence: 99%

Impact against empty and water-filled X65 steel pipes – Experiments and simulations

Kristoffersen

Casadei

Børvik

et al. 2014

International Journal of Impact Engineering

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Offshore pipelines are frequently subjected to accidental impact loads, e.g. from anchors or trawl gear. A lot of parameters -including the pipe geometry, material properties, pipeline content, impact velocity, etc. -influence the course of such an impact. Some of these parameters have been studied quite extensively while others not so much. This study presents material and component tests on specimens taken from an X65 offshore pipeline.

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Permanent fluid–structure interaction with non-conforming interfaces in fast transient dynamics

Cited by 34 publications

References 7 publications

Transient pressure loading of clamped metallic plates with pre-formed holes

Transient pressure loading of clamped metallic plates with pre-formed holes

Unified Lagrangian Formulation for Fluid and Solid Mechanics, Fluid-Structure Interaction and Coupled Thermal Problems Using the PFEM

Impact against empty and water-filled X65 steel pipes – Experiments and simulations

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