Application of Lagrange multipliers for coupled problems in fluid and structural interactions

Unger, Ralf; Haupt, Matthias; Horst, Peter

doi:10.1016/j.compstruc.2007.01.006

Cited by 25 publications

(21 citation statements)

References 34 publications

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“…Strong discretization mismatch will result in unphysical load peaks, which can be alleviated by a locally more accurate approach, where the §uid shape functions are used for the Lagrange multiplier leading to an approach comparable to the Mortar-technique (see [12]). For this transfer approach, an inversion of the sparse and positive de¦nite matrix is necessary.…”

Section: Nonconforming Spacial Discretization At the Interfacementioning

confidence: 99%

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Fluid-structure interaction analysis applied to thermal barrier coated cooled rocket thrust chambers with subsequent local investigation of delamination phenomena

Kowollik

Horst

Haupt

2013

Progress in Propulsion Physics

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The aim of this work is to investigate numerically thermal barrier coating (TBC) systems applied to realistic rocket thrust chamber conditions. A global full parametric three-dimensional (3D) modeling approach for cooled rocket thrust chambers is presented to be able to simulate the §uidstructure interaction (FSI) phenomena involved. In a subsequent analysis step, realistic mechanical and thermal boundary conditions are extracted from critical design regions of the global model and applied to a local ¦nite element model (FEM) to analyze possible TBC delaminations by means of a Fracture Mechanics (FM) approach.

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Section: Nonconforming Spacial Discretization At the Interfacementioning

confidence: 99%

“…In systems with a large number of degrees of freedom, this decomposition is computational expensive. DualLagrange multipliers can be constructed depending on the §uid shape functions, which lead to a diagonalized matrix making the inversion process trivial [12].…”

Section: Nonconforming Spacial Discretization At the Interfacementioning

confidence: 99%

Fluid-structure interaction analysis applied to thermal barrier coated cooled rocket thrust chambers with subsequent local investigation of delamination phenomena

Kowollik

Horst

Haupt

2013

Progress in Propulsion Physics

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“…In the last years and motivated by different industries such as aeronautics, naval or more recently biomedical sciences, there have been new advances in development and use of computational methods for fluid-structure interactions in order to reach more effective computational techniques [43][44][45][46][47][48] and solving more difficult problems. As an example of the increasing interest on solving industrial fluid-structure problems the works of Petitpas et al [49] or Lecysyn et al [22,23] can be mentioned, in which a ballistic impact on an industrial tank, filled with a toxic fluid, is studied.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of CFRP fluid-filled tubes subjected to high-velocity impact

Artero-Guerrero

Pernas-Sánchez

Varas

et al. 2013

Composite Structures

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In recent years, vulnerability against high-velocity impact loads has become an increasingly critical issue in the design of composite aerospace structures. The effects of Hydrodynamic Ram (HRAM), a phenomenon that occurs when a high-energy object penetrates a fluid-filled container, are of particular concern in the design of wing fuel tanks for aircraft because it has been identified as one of the important factors in aircraft vulnerability. The projectile transfers its momentum and kinetic energy through the fluid to the surrounding structure, increasing the risk of catastrophic failure. In the present paper, the commercial finite-element code * Corresponding author. Fax number: 34 916248331. E-mail address:jlpuente@ing.uc3m.es 1 ABAQUS/Explicit has been used to simulate an HRAM event due to the impact of a steel spherical projectile into a water-filled woven CFRP square tube. In order to simulate the fluid-structure interaction, the Coupled Eulerian Lagrangian (CEL) approach is used. Experimental tests which indicate the pressure at different points of the fluid, strains of the walls and cavity evolution for different impact velocities are compared with the numerical results in order to assess the validity and accuracy of CEL technique in reproducing such a complex phenomenon. Also, several numerical impacts at different initial projectile velocities are performed to study its influence in the HRAM phenomenon.

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“…In the last few years, there have been new advances in development and use of computational methods for fluid-structure interactions due to the interest of reach more effective computational techniques [5,42,46,20,41,25] and solve more difficult problems motivated by different industries, such as aeronautics, naval or more recently biomedical sciences.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of partially filled aircraft fuel tanks submitted to Hydrodynamic Ram

Varas

Zaera

López-Puente

2012

Aerospace Science and Technology

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a b s t r a c t Keywords:Hydrodynamic Ram Fluid-structure interaction Aircraft vulnerability Impact Fuel tank Hydrodynamic Ram (HRAM) is a phenomenon that occurs when a high-kinetic energy object penetrates a fluid-filled container. The projectile transfers its momentum and kinetic energy through the fluid to the surrounding structure, increasing the risk of catastrophic failure and excessive structural damage. This is of particular concern in the design of wing fuel tanks for aircraft since it has been identified as one of the important factors in aircraft vulnerability. Usually the HRAM phenomenon is analyzed considering completely filled tanks, but its effect on partially filled containers should also be taken into account due to the fact that tanks use to be impacted under these conditions. In the present paper, the commercial finite element code LS-DYNA has been used to simulate an HRAM event created by a steel spherical projectile impacting a partially water-filled aluminium square tube. The ALE formulation is employed to reproduce the event. Experimental tests which indicate the pressure at different points of the fluid, displacement of the walls and cavity evolution for different impact velocities, are compared with the numerical results in order to assess the validity and accuracy of the ALE technique in reproducing such a complex phenomenon.

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Application of Lagrange multipliers for coupled problems in fluid and structural interactions

Cited by 25 publications

References 34 publications

Fluid-structure interaction analysis applied to thermal barrier coated cooled rocket thrust chambers with subsequent local investigation of delamination phenomena

Fluid-structure interaction analysis applied to thermal barrier coated cooled rocket thrust chambers with subsequent local investigation of delamination phenomena

Numerical analysis of CFRP fluid-filled tubes subjected to high-velocity impact

Numerical modelling of partially filled aircraft fuel tanks submitted to Hydrodynamic Ram

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