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Showing 1 to 20 of 42 for “"Arbitrary Lagrangian-Eulerian"”.
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Numerical simulation of friction welding processes: An arbitrary Lagrangian-Eulerian approach
… and degrading the simulation accuracy, an arbitrary Lagrangian Eulerian (ALE) formulation for coupled finite strain thermoplasticity is developed and incorporated into the solver, in which the motion of the reference configuration is represented incrementally in terms of a reference …
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Simulation of hydrodynamics of the jet impingement using Arbitrary Lagrangian Eulerian formulation
… Traditional approaches of finite element method, Lagrangian and Eulerian, each has its own benefits and drawbacks. Lagrangian approach has been used widely in solid domains and Eulerian approach has been widely used in fluid fields. Jet impingement problem, due to its unknown free surface and the …
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Airbag simulation utilising Arbitrary Lagrangian Eulerian methodology for Out Of Position cases
… and simulation process which utilises the Arbitrary Lagrangian Eulerian (ALE)algorithms, especially in OOP loading cases. This has been carried out using a transientdynamic finite element software package called LS-DYNA. The load cases considered arein accordance with the specific scenarios …
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Arbitrary Lagrangian-Eulerian form of flowfield dependent variation (ALE-ADV) method for moving boundary problems
… with a body interpolation technique called Arbitrary Lagrangian-Eulerian (ALE) method. The ALE method is a technique that combines Lagrangian and Eulerian descriptions of a continuum in one numerical scheme, which then enables a computational mesh to follow the moving structures in an …
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Well balanced Arbitrary-Lagrangian-Eulerian Finite Volume schemes on moving nonconforming meshes for non-conservative Hyperbolic systems
… presents a novel second order accurate direct Arbitrary-Lagrangian-Eulerian (ALE) Finite Volume scheme for nonlinear hyperbolic systems, written both in conservative and non-conservative form, whose peculiarity is the nonconforming motion of interfaces. Moreover it has been coupled together …
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Investigation of Close Proximity Underwater Explosion Effects on a Ship-Like Structure Using the Multi-Material Arbitrary Lagrangian Eulerian Finite Element Method
… fluid to a structure using the Multi-Material Arbitrary Lagrangian/Eulerian method. A one dimensional case modeling the detonation of a spherical TNT charge underwater is investigated. Three dimensional cases modeling the detonation of an underwater spherical TNT charge, and US Navy Blast Test …
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The effect of bend radius on the impulse transfer characteristics of V-hulls
… by performing a mesh convergence study on the Arbitrary Lagrangian-Eulerian (ALE) mesh, and validated using the impulse values measured from a 58 g detonation onto a 120° V-plate as it resulted in the highest impulse. Element lengths of 1.5, 2.0 and 3.0mm were investigated. Element lengths of …
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Impact Characterization of Earth Entry Vehicle for Terminal Landing (on Soil)
… data has been created. The numerical methods, Lagrangian, arbitrary Lagrangian-Eulerian (ALE), and spherical particle hydrodynamics (SPH) are compared to determine their relative accuracy in modeling soil deformation and EEV acceleration. Experimentally validated soil material parameters and …
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Parametric and Wake Study of a Ducted Propeller Using The Variational Multi-Scale Method
… were incorporated as moving surfaces via an arbitrary Lagrangian-Eulerian treatment of such equations. The domain features surfaces such as struts, ducts and blades whose boundary layer mesh requirements are relaxed via weak boundary condition enforcement. Good grid convergence is obtained. …
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Finite element modeling of energy-absorbing materials in blast-loaded structures
… transferred energy. Many models using ConWep and Arbitrary-Lagrangian-Eulerian (ALE) techniques were created to test the loading methods available in LS-DYNA. Additional ConWep models were created to directly compare simulations against ballistic pendulum experiments. The ConWep model results …
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Solution of fluid-structure interaction problems using a discontinuous Galerkin technique
… Navier-Stokes equations on a fixed domain, an arbitrary Lagrangian Eulerian (ALE) approach is used to derive the equations for the deforming domain. A geometric conservation law (GCL) is then introduced, which guarantees freestream preservation of the numerical scheme. The space discretization …
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A numerical study of flow-structure interactions with application to flow past a pair of cylinders
… changes on the boundaries of the flow domain. An Arbitrary Lagrangian Eulerian (ALE) scheme is incorporated to efficiently move the mesh without remeshing. Efficient three-dimensional simulations with periodicity in at least one space direction are achieved using Hybrid Fourier-Jacobi expansions. …
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Magnetohydrodynamic Simulations of Fast Instability Development in Pulsed-Power--Driven Explosions and Implosions of Electrical Conductors
… 1D and 2D resistive magnetohydrodynamics (MHD) arbitrary-Lagrangian-Eulerian (ALE) simulations of electrical wire explosions (EWEs) and liner implosions to show that micrometer-scale surface roughness seeds the electrothermal instability (ETI), which induces early melting in pockets across the …
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A discontinuous Galerkin spectral element method compressible flow solver
… flow solver. Moving-mesh capabilities via the arbitrary Lagrangian-Eulerian method are verified and have enabled simulation of complex engineering applications with moving geometries such as flows in internal combustion engines. Spatial (exponential) and temporal (up to fourth-order) …
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Error Assessment in FEM Calculations of Flows with Moving Boundaries
… This method falls under the general category of Arbitrary Lagrangian Eulerian methods. In this method the global mesh is fixed and adaptations are made locally in both space and time to describe interface movement. Therefore, the global mesh is independent of interface movement, and the …
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Finite element solution of interface and free surface three-dimensional fluid flow problems using flow-condition-based interpolation
… can be overcome by proper employment of an Arbitrary Lagrangian Eulerian (ALE) method derived from the Reynolds transport theorem to compute unsteady Newtonian flows including fluid interfaces and free surfaces. The proposed method conserves mass very accurately and obtains stable and …
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Material Characterization and Numerical Techniques for Accurate Prediction of Snow-Tire Interactions
… of different numerical methods including Arbitrary Lagrangian-Eulerian (ALE), Smoothed Particle Hydrodynamics (SPH), and a hybrid SPH-FEM was evaluated. Simulations of in-situ devices such as the CTI penetrometer, Clegg hammer, and vane-cone device compared method performance in terms of …
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ALE and CEL formulations of pile installation in sand
… Then numerical model employs Multi-Material Arbitrary Lagrangian-Eulerian (MMALE) method to solve the issues associated with large deformation. The performance of MMALE is evaluated against several benchmarks for which analytical and experimental results are available. An advanced …
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Behavior of reinforced concrete column-beam joint subjected to close in blast loads with polyurea and FRP sheets
… using finite element modeling in LS-DYNA with an Arbitrary Lagrangian-Eulerian (ALE) formulation. Failure is captured through element erosion based on maximum principal strain. The study employs concrete with a compressive strength of 38.5 MPa and reinforcing steel with a yield strength of 400 …
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Modeling, analysis and numerical simulation of reactive solute transport problems in moving domains
… the mathematical formulation of the model in the arbitrary Lagrangian-Eulerian (ALE) framework. We study the well-posedness of the model.We then discretize the conservative variational form of the problem in the ALE framework in space, using the moving mesh ALE finite element method (ALE-FEM). In …
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