A cell-centred arbitrary Lagrangian–Eulerian (ALE) method

Problems involving large deformations are the focus of numerical modeling researches in recent decades due to the challenge of finding a kinematic appropriate description of the continuum. In recent years, different formulations have been used to describe such problems as the Arbitrary Lagrangian Eulerian (ALE) method and the Material Point Method (MPM). These two methods allow to perform dynamic analyzes involving large deformations. In this way, this work aims to present a comparison of problems applied to Geotechnics involving large deformations and large displacements, using MPM and FEM associated with the ALE method. For this purpose, three problems are simulated: sliding of blocks on an inclined plane, runout process of sand and instability of a slope using the MPM and the FEM associated with the ALE method. In all cases a comparison of the results is presented, and the advantages and disadvantages of each method are discussed.

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A Multi-Material CCALE-MOF Approach in Cylindrical Geometry

Communications in Computational Physics ◽

10.4208/cicp.190912.080513a ◽

2014 ◽

Vol 15 (2) ◽

pp. 330-364 ◽

Cited By ~ 7

Author(s):

Marie Billaud Friess ◽

Jérôme Breil ◽

Pierre-Henri Maire ◽

Mikhail Shashkov

Keyword(s):

Fluid Flows ◽

Cylindrical Geometry ◽

Arbitrary Lagrangian Eulerian ◽

Interface Reconstruction ◽

Recent Developments ◽

A Cell ◽

Cylindrical Geometries ◽

The Moment ◽

New Formulation ◽

Compressible Fluid Flows

AbstractIn this paper we present recent developments concerning a Cell-Centered Arbitrary Lagrangian Eulerian (CCALE) strategy using the Moment Of Fluid (MOF) interface reconstruction for the numerical simulation of multi-material compressible fluid flows on unstructured grids in cylindrical geometries. Especially, our attention is focused here on the following points. First, we propose a new formulation of the scheme used during the Lagrangian phase in the particular case of axisymmetric geometries. Then, the MOF method is considered for multi-interface reconstruction in cylindrical geometry. Subsequently, a method devoted to the rezoning of polar meshes is detailed. Finally, a generalization of the hybrid remapping to cylindrical geometries is presented. These explorations are validated by mean of several test cases using unstructured grid that clearly illustrate the robustness and accuracy of the new method.

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Steel Plate Behavior under Blast Loading-Numerical Approach Using LS-DYNA

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.842.200 ◽

2016 ◽

Vol 842 ◽

pp. 200-207 ◽

Cited By ~ 2

Author(s):

Vu Minh Thanh ◽

Sigit P. Santosa ◽

Djarot Widagdo ◽

Ichsan Setya Putra

Keyword(s):

Blast Resistance ◽

Blast Loading ◽

Numerical Approach ◽

Coupling Method ◽

Steel Plates ◽

Computational Time ◽

Arbitrary Lagrangian Eulerian ◽

Ale Method ◽

Wide Range ◽

Coupling Algorithm

Plate is one of the most common structural elements, which appears in a wide range of applications: steel bridges, blast-resistance door, and armored vehicles. In this paper, the behavior of steel plates under blast loading was studied through numerical approaches using LS DYNA and then the results were compared with the experiment results obtained from existing literatures. The study of a clamped square plate exposed to blast loading in three distinct stand-off distances. Three different methods of modeling blast loading were used, namely: empirical blast method, arbitrary Lagrangian Eulerian (ALE) method, and coupling of Lagrangian and Eulerian method. The empirical blast method was deployed by using key card *LOAD_BLAST in LS-DYNA. In ALE method, Langrangian and Eulerian solution were combined in the same model and the fluid-structure interaction (FSI) handled by coupling algorithm. In coupling method, the engineering load blast in LS-DYNA (*LOAD_BLAST_ENHANCED) was coupled with the ALE solver. In terms of central deflection and computational time, the coupling method appeared to be the best method which is very time-effective and showed a good correlation with the experiment data.

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Comparison of Fluid Structure Interaction Capabilities in Finite Volume and Finite Element Based Codes

Volume 12: Mechanics of Solids, Structures, and Fluids ◽

10.1115/imece2020-23082 ◽

2020 ◽

Author(s):

Qiyue Lu ◽

Alfonso Santiago ◽

Seid Koric ◽

Paula Cordoba

Keyword(s):

Finite Element ◽

Finite Volume ◽

Fluid Structure Interaction ◽

Arbitrary Lagrangian Eulerian ◽

Fluid Structure ◽

Ale Method ◽

Structure Interaction ◽

Commercial Code ◽

Wide Range ◽

Volume Method

Abstract Fluid-Structure Interaction (FSI) simulations have applications to a wide range of engineering areas. One popular technique to solve FSI problems is the Arbitrary Lagrangian-Eulerian (ALE) method. Both academic and industry communities developed codes to implement the ALE method. One of them is Alya, a Finite Element Method (FEM) based code developed in Barcelona Supercomputing Center (BSC). By analyzing the application on a simplified artery case and compared to another commercial code, which is Finite Volume Method (FVM) based, this paper discusses the mathematical background of the solver for domains, and carries out verification work on Alya’s FSI capability. The results show that while both codes provide comparable FSI results, Alya has exhibited better robustness due to its Subgrid Scale (SGS) technique for stabilization of convective term and the subsequent numerical treatments. Thus this code opens the door for more extensive use of higher fidelity finite element based FSI methods in future.

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A stabilized ALE method for computational fluid–structure interaction analysis of passive morphing in turbomachinery

Mathematical Models and Methods in Applied Sciences ◽

10.1142/s0218202519410057 ◽

2019 ◽

Vol 29 (05) ◽

pp. 967-994 ◽

Cited By ~ 19

Author(s):

Alessio Castorrini ◽

Alessandro Corsini ◽

Franco Rispoli ◽

Kenji Takizawa ◽

Tayfun E. Tezduyar

Keyword(s):

Fluid Mechanics ◽

Interaction Analysis ◽

Fluid Structure Interaction ◽

Arbitrary Lagrangian Eulerian ◽

Axial Fan ◽

Fluid Structure ◽

Ale Method ◽

Structure Interaction ◽

And Performance ◽

Passive Morphing

Computational fluid–structure interaction (FSI) and flow analysis now have a significant role in design and performance evaluation of turbomachinery systems, such as wind turbines, fans, and turbochargers. With increasing scope and fidelity, computational analysis can help improve the design and performance. For example, it can help add a passive morphing attachment (MA) to the blades of an axial fan for the purpose of controlling the blade load and section stall. We present a stabilized Arbitrary Lagrangian–Eulerian (ALE) method for computational FSI analysis of passive morphing in turbomachinery. The main components of the method are the Streamline-Upwind/Petrov–Galerkin (SUPG) and Pressure-Stabilizing/Petrov–Galerkin (PSPG) stabilizations in the ALE framework, mesh moving with Jacobian-based stiffening, and block-iterative FSI coupling. The turbulent-flow nature of the analysis is handled with a Reynolds-Averaged Navier–Stokes (RANS) model and SUPG/PSPG stabilization, supplemented with the “DRDJ” stabilization. As the structure moves, the fluid mechanics mesh moves with the Jacobian-based stiffening method, which reduces the deformation of the smaller elements placed near the solid surfaces. The FSI coupling between the blocks of the fully-discretized equation system representing the fluid mechanics, structural mechanics, and mesh moving equations is handled with the block-iterative coupling method. We present two-dimensional (2D) and three-dimensional (3D) computational FSI studies for an MA added to an axial-fan blade. The results from the 2D study are used in determining the spanwise length of the MA in the 3D study.

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