Session Details

13:30
A primal discontinuous Petrov Galerkin Finite Element Method
Tobias Steiner (Leibniz Universität Hannover), Peter Wriggers (Leibniz Universität Hannover)

Kurzfassung:
In this contribution a primal discontinuous Petrov Galerkin Finite Element Method (dPG FEM) with a linear elastic isotropic material model is presented. This novel mixed discretization method was introduced by Demkowicz and Gopalakrishnan in 2010. The behavior of this formulation is studied with benchmark simulations for small deformations in the nearly incompressible case. Furthermore, a possible extension for a nonlinear Finite Element formulation is suggested.

13:50
Virtual simulation of deformation behavior of NiTi stents used in minimally invasive surgery
Sharath Chandra Chavalla (Otto von Guericke University Magdeburg), Daniel Juhre (Otto von Guericke University Magdeburg)

Kurzfassung:
Recently isogeometric analysis (IGA) is developed to bridge gap between design and computation analysis. It represents and calculates geometries using non-uniform rational B-splines (NURBS). IGA uses high-order, high-regular basis functions aiding in higher accuracy and minimal computation efforts unlike finite element method. The project aim is efficient simulation of the deformation behavior of carotid NiTi stents in throat arteries which leads to a step closer in realizing real-time simulation.

14:10
Flexible Wheelset Models in Dynamic Interaction with Track
Mustapha Afriad (Sorbonne Universités, Université de technologie de Compiègne), Mohamed Rachik (Sorbonne Universités, Université de technologie de Compiègne), Ludovic Cauvin (Sorbonne Universités, Université de technologie de Compiègne), Olivier Cazier (French National Railways Company (SNCF)), Guy-Leon Kaza (Sorbonne Universités, Université de technologie de Compiègne)

Kurzfassung:
Until now, multibody models of vehicle-track interaction consider rigid components. In order to improve these models, it seems necessary to consider flexible components by coupling finite element analysis with multibody dynamics simulations. The main objective of this study is to present the methodology used to integrate wheelset flexibility in a multibody model of train. Wheel/rail contact forces and vehicle stability obtained with rigid wheelset and flexible wheelset will be compared.

14:30
Improving Numerical Stability of a Tensor-Based Blood Damage Model using the Log-Conformation Formulation
Stefan Haßler (RWTH Aachen University), Lutz Pauli (RWTH Aachen University), Marek Behr (RWTH Aachen University)

Kurzfassung:
Computational Hemodynamics enables the prediction of hydraulic properties and biocompatibility of new Ventricular Assist Devices (VADs). For hemolysis predictions, we use a tensor-based morphology model that accounts for the physiological behavior of red blood cells in blood flow. It resembles the viscoelastic Oldroyd-B equation and shows similar difficulties in numerical stability. Therefore, we apply the log-conformation formulation to the morphology model and show its enhanced stability.

14:50
Parallel Stabilized FEM for the Flow Simulations of Microstructured Fluids
Metin Cakircali (Forschungszentrum Jülich GmbH), Marek Behr (RWTH Aachen University)

Kurzfassung:
The Single-Walled Carbon Nanotubes (SWNT) have unique properties that make them ideal for nano-materials. We use efficient numerical methods to improve our understanding of the macroscale assembly processes (e.g., fiber spinning). The Galerkin/Least-Squares formulation is derived for the fully coupled transient equation systems. Space-time elements with equal order velocity-pressure-order parameter are used for several relevant test cases. The results are compared with available literature data.