Search for dissertations about: "penalty formulation"

Showing result 1 - 5 of 13 swedish dissertations containing the words penalty formulation.

  1. 1. Adaptive Finite Element Methods for the Reynolds Thin Film Model with Cavitation

    Author : Bertil Nilsson; Sweden Gothenburg Chalmers University of Technology Department of Applied Mechanics; []
    Keywords : tribology; Reynolds equation; cavitation; FEM; adaptivity; variational inequality; penalty formulation; error estimation; residual; duality;

    Abstract : The main purpose of this thesis is to use modern goal-oriented adaptive finite element techniques in order to improve the numerical simulation of tribology. Two novel adaptive finite element methods for the Reynolds thin film model including cavitation are presented and their different strategies are compared. READ MORE

  2. 2. Finite element procedures for virtual tribology

    Author : Bertil Nilsson; Göteborgs universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Tribology; Reynolds equation; Stokes equation; cavitation; FEM; adaptivity; variational inequality; penalty formulation; error estima- tion; residual; duality.;

    Abstract : The main purpose of this thesis is to use modern goal-oriented adap- tive finite element techniques in order to improve the numerical simulation of tribology. Two novel adaptive finite element methods for the Reynolds thin film model, and Stokes model including cavitation are presented and their different strategies are compared. READ MORE

  3. 3. On the Arbitrary Lagrangian-Eulerian Finite Element Method

    Author : Lars Olovsson; Kenneth Runesson; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; large deformation plasticity; FEM; ALE; multi-material Euler; machining simulations;

    Abstract : This thesis has been devoted to the study and development of algorithms for Finite Element (FE) simulations of mechanical processes involving large deformations. Aspects of three different formulations have been considered:(i) The single material Arbitrary Lagrangian-Eulerian (ALE) formulation is a method where the FE mesh is allowed to move independently to the material flow. READ MORE

  4. 4. Robust Formulations for Beam-to-Beam Contact

    Author : Hamid Reza Motamedian; Artem Kulachenko; Anders Klarbring; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Structures; Finite Element Methods; Hållfasthetslära; Solid Mechanics;

    Abstract : Contact between beam elements is a specific category of contact problems which was introduced by Wriggers and Zavarise in 1997 for normal contact and later extended by Zavarise and Wriggers to include tangential and frictional contact. In these works, beam elements are assumed to have rigid circular cross-sections and each pair of elements cannot have more than one contact point. READ MORE

  5. 5. Stable High Order Finite Difference Methods for Wave Propagation and Flow Problems on Deforming Domains

    Author : Samira Nikkar; Jan Nordström; Gunilla Kreiss; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : We construct stable, accurate and efficient numerical schemes for wave propagation and flow problems posed on spatial geometries that are moving, deforming, erroneously described or non-simply connected. The schemes are on Summation-by-Parts (SBP) form, combined with the Simultaneous Approximation Term (SAT) technique for imposing initial and boundary conditions. READ MORE