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Documents published in Scipedia

• Unified Lagrangian formulation for solid and fluid mechanics and FSI problems

  A. Franci, E. Oñate, J. Puigbó

  Comput. Methods Appl. Mech. Engrg. (2016). Vol. 107(11) pp. 970-990 (preprint) Vol. 298, pp. 520-547

  
  

  Abstract

  We present a Lagrangian monolithic strategy for solving fluid-structure interaction (FSI) problems. The formulation is called Unified because fluids and solids are solved using the same solution scheme and unknown variables. The method is based on a mixed velocity-pressure formulation. Each time step increment is solved via an iterative partitioned two-step procedure. The Particle Finite Element Method (PFEM) is used for solving the fluid parts of the domain, while for the solid ones the Finite Element Method (FEM) is employed. Both velocity and pressure fields are interpolated using linear shape functions. For quasiincompressible materials, the solution scheme is stabilized via the Finite Calculus (FIC) method. The stabilized elements for quasi-incompressible hypoelastic solids and Newtonian fluids are called VPS/S-element and VPS/F-element, respectively. Other two non-stabilized elements are derived for hypoelastic solids. One is based on a Velocity formulation (V-element) and the other on a mixed Velocity-Pressure scheme (VP-element). The algorithms for coupling the solid elements with the VPS/F fluid element are explained in detail. The Unified formulation is validated by solving benchmark FSI problems and by comparing the numerical solution to the ones published in the literature.

  Abstract
  We present a Lagrangian monolithic strategy for solving fluid-structure interaction (FSI) problems. The formulation is called Unified because fluids and solids are solved [...]

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• Modeling of ground excavation with the particle finite element method

  J. Puigbó, E. Oñate, B. Suárez

  Monograph CIMNE (2010). M116

  
  

  Abstract

  The present work introduces a new application of the Particle Finite Element Method (PFEM) for the modeling of excavation problems. Lagrangian descriptions of motion of the continuum medium are the natural way of describing motion in solid mechanics. Particle finite element methods are based in these solid mechanics settings that can treat large material deformations and rapidly changing boundaries. These capabilities are very suitable for modeling fluid motions and moving free surfaces. That is the reason that the most of the research and applications of PFEM can be found in the context of computational fluid dynamics (CFD) instead of solid mechanics. The satisfying results in modeling fluids have been the motivation to use this method in dynamic solid mechanics. The simulation of an excavation process is a non-linear dynamic problem. It contains geometrical, material and contact non-linearities. Modeling the contact process can be classiffied as the main difficulty. The simulation face the problems of: the detection of a changing geometry, the detection of contact between several solid domains, the estimation of correct interacting forces, the computation of the wear related to this contact forces and the removing of the material that has been excavated from the model. The PFEM have its fundamentals in the classical non linear finite element analysis. The formulation provides a foundation in the updated lagrangian formulation for solids. The dynamic problem is integrated using an implicit scheme. Remeshing strategies are employed in order to identify the boundary surfaces. A remeshing of the domain is introduced for the detection of rapidly changing boundaries. The Delaunay tessellation and the alpha-shape concept together, are used as a methodology to de_ne the boundary from a cloud of points. At the same time an interface mesh is created for contact recognition. A particular constitutive contact law has been developed for capturing contact normal and frictional forces using this mesh. By means of an Archard-type law, the excavation and damage caused in the ground is quantified. The erosion and wear parameters of the grounds under study determine the excavability. The behavior of the geomaterials is described using a Damage Model which model fracture in the continuum. The update and storage of the variables in particles have especial schemes for its correct treatment. The method and the meshing process is adapted for the simulation of an excavation problem. PFEM is presented as a very suitable tool for the treatment of excavation problem. The method gives solution for the analysis of all processes that derive from it. The method has a high versatility and a reasonable computational cost. The obtained results are really promising.

  Abstract
  The present work introduces a new application of the Particle Finite Element Method (PFEM) for the modeling of excavation problems. Lagrangian descriptions of motion of the [...]

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Articles (Documents not available in Scipedia)

• Generation of segmental chips in metal cutting modeled with the PFEM

  JMR Prieto, JM Carbonell, JC Cante, J Oliver, P Jonsén

  Computational Mechanics, 1-17, 2017

• Continuous chip formation in metal cutting processes using the Particle Finite Element Method (PFEM)

  JM Rodríguez, JM Carbonell, JC Cante, J Oliver

  International Journal of Solids and Structures 120, 81-102, 2017

• PFEM formulation for thermo-coupled FSI analysis. Application to nuclear core melt accident

  A Franci, E Oñate, JM Carbonell, M Chiumenti

  Computer Methods in Applied Mechanics and Engineering 325, 711-732, 2017

• Performance of mixed formulations for the particle finite element method in soil mechanics problems

  L Monforte, JM Carbonell, M Arroyo, A Gens

  Computational Particle Mechanics 4 (3), 269-284, 2017

• Damage analysis of masonry structures subjected to rockfalls

  O Mavrouli, PG Giannopoulos, JM Carbonell, C Syrmakezis

  Landslides 14 (3), 891-904, 2017

• Numerical simulation of undrained insertion problems in geotechnical engineering with the Particle Finite Element Method (PFEM)

  L Monforte, M Arroyo, JM Carbonell, A Gens

  Computers and Geotechnics 82, 144-156, 2017

• Simulation of the cone penetration test: discrete and continuum approaches

  A Gens Solé, M Arroyo Alvarez de Toledo, J Butlanska, L Monforte Vila, ...

  Geotechnical and geophysical site characterisation 5: Proceedings of the …, 2016

• Simulation of the cone penetration test: discrete and continuum approaches

  A Gens, M Arroyo, J Butlanska, JM Carbonell, M Ciantia, L Monforte, ...

  Aust. Geomech 51 (4), 169-182, 2016

• Velocity‐based formulations for standard and quasi‐incompressible hypoelastic‐plastic solids

  A Franci, E Oñate, JM Carbonell

  International Journal for Numerical Methods in Engineering 107 (11), 970-990, 2016

• The Double Hierarchy Method. A parallel 3D contact method for the interaction of spherical particles with rigid FE boundaries using the DEM

  M Santasusana, J Irazábal, E Oñate, JM Carbonell

  Computational Particle Mechanics 3 (3), 407-428, 2016

• The particle finite element method (PFEM) in thermo‐mechanical problems

  JM Rodriguez, JM Carbonell, JC Cante, J Oliver

  International Journal for Numerical Methods in Engineering 107 (9), 733-785, 2016

• Numerical simulation of penetration problems in geotechnical engineering with the particle finite element method (PFEM)

  L Monforte Vila, JM Carbonell Puigbó, M Arroyo Alvarez de Toledo, ...

  Proceedings of the IV International Conference on Particle-Based Methods …, 2015

• Explicit finite deformation stress integration of the elasto-plastic constitutive equations

  L Monforte, M Arroyo, A Gens, JM Carbonell

  Computer Methods and Advances in Geomechanics, 267-272, 2015

• On the effect of the bulk tangent matrix in partitioned solution schemes for nearly incompressible fluids

  A Franci, E Oñate, JM Carbonell

  International Journal for Numerical Methods in Engineering 102 (3-4), 257-277, 2015

• Evaluation of multilayer pavement viscoelastic properties from falling weight deflectometer using neural networks

  JM Gonzalez, JM Carbonell, W van Bijsterveld

  Materials and Infrastructures 1, 211-225, 2014

• A particle finite element method (PFEM) for coupled thermal analysis of quasi and fully incompressible flows and fluid-structure interaction problems

  E Oñate, A Franci, JM Carbonell

  Numerical Simulations of Coupled Problems in Engineering, 129-156, 2014

• On the effect of the tangent bulk stiffness matrix in the analysis of free surface Lagrangian flows using PFEM

  A Franci, E Oñate, JM Carbonell

  Research Report CIMNE PI402, 2013

• Modelling of tunnelling processes and rock cutting tool wear with the particle finite element method

  JM Carbonell, E Oñate, B Suárez

  Computational Mechanics 52 (3), 607-629, 2013

• Advances in the particle finite element method (PFEM) for solving coupled problems in engineering

  E Oñate, SR Idelsohn, MA Celigueta, R Rossi, J Marti, JM Carbonell, ...

  Particle-Based Methods, 1-49, 2011

• Análisis numérico de los fenómenos hidrodinámicos en escolleras con aplicaciones a presas de materiales sueltos

  RJ Hernández, E Oñate, SR Idelsohn, MA Celigüeta, R Rossi, J Marti, ...

  Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyers de …, 2010

• Modeling of surface wear by the particle finite element method: application to tunneling processes

  JM Carbonell Puigbó, B Suárez Arroyo, E Oñate Ibáñez de Navarra

  Computational Plasticity X-Fundamentals and Applications, 1-4, 2009