Person

Dr.-Ing., apl. Professorin

Stefanie Elgeti

Private lecturer

Stefanie Elgeti
Chair for Computational Analysis of Technical Systems

Address

Building: Rogowski

Room: 220

Schinkelstraße 2

52062 Aachen

Contact

workPhone
Phone: +49 241 80 99922
Fax: +49 241 80 99910
 

About me

My path to simulation science in general and CATS in particular started with a diploma in Mechanical Engineering, majoring in "Manufacturing Techniques for Microsystems". In 2011, I completed my PhD thesis with the topic "Free-Surface Flows in Shape Optimization of Extrusion Dies". This was followed in the year 2016 by my habilitation on "CAD-Conforming Finite Element Methods in Engineering Design". From 2012-2015, I was a member of the GAMM-Juniors, acting as vice-spokesperson from 2013-2014. Currently, I am co-chairperson of the ECCOMAS Young Investigator Group.

  Cross Stefanie Elgeti

Research

My current research interests lie in the simulation and numerical design of primary manufacturing processes. From the mathematical point of view, this constitues an inverse problem. Together with my work group, I have considered applications in the area of plastics profile extrusion, injection molding, as well as high-pressure die casting. Our task is the simulation of all process steps ranging from the filling via solidification to the computation of warpage and residual stresses. These simulations serve as a basis for shape optimization of the cavity and the cooling channels.

The methods we employ for these applications encompass:

  • free-surface flow,
  • mesh-deformation methods,
  • non-Newtonian material models,
  • spline-based finite element methods,
  • PDE-constrained shape optimization techniques.
 

Teaching

I am involved in the following courses:

Simulation Methods in Mechanical Engineering

Simulation Methods for Distributed Systems

Isogeometric Analysis

Supervised Dissertations

  • Atanas Stavrev: NURBS-Enhanced Geometry Handling for Free-Surface Flow Problems and Immersed Boundary Methods, 2017.

 

Journal Article

Title
Boundary-conforming free-surface flow computations: Interface tracking for linear, higher-order and isogeometric finite elements
Published in: Computer methods in applied mechanics and engineering (2017)
An ultraweak DPG method for viscoelastic fluids
Published in: Journal of non-Newtonian fluid mechanics (2017)
Simplex space-time meshes in two-phase flow simulations
Published in: International journal for numerical methods in fluids (2017)
Deforming Fluid Domains Within the Finite Element Method : Five Mesh-Based Tracking Methods in Comparison
Published in: Archives of computational methods in engineering (2016)
Space-time NURBS-enhanced finite elements for free-surface flows in 2D
Published in: International journal for numerical methods in fluids (2016)
Geometrically accurate, efficient, and flexible quadrature techniques for the tetrahedral finite cell method
Published in: Computer methods in applied mechanics and engineering (2016)
Automatic implementation of material laws: Jacobian calculation in a finite element code with TAPENADE
Published in: Computers and mathematics with applications : CAMWA (2016)
Individualized production in die-based manufacturing processes using numerical optimization
Published in: International Journal of Advanced Design and Manufacturing Technology (2015)
Fully-implicit log-conformation formulation of constitutive laws
Published in: Journal of non-Newtonian fluid mechanics (2014)
Design Criteria in Numerical Design of Profile Extrusion Dies
Published in: Key engineering materials (2013)
Towards shape optimization of profile extrusion dies with respect to homogeneous die swell
Published in: Journal of non-Newtonian fluid mechanics (2013)
Numerical shape optimization as an approach to extrusion die design
Published in: Finite elements in analysis and design (2012)
On the Usage of NURBS as Interface Representation in Free-Surface Flows
Published in: International journal for numerical methods in fluids (2011)
Automatische Optimierung in der Profilextrusion
Published in: Automatisierungstechnische Praxis : atp (2011)
Die Design: Automatically Optimizing Profile Dies
Published in: Kunststoffe / Kunststoffe international (2009)
Auf dem Weg zur Fließkanaloptimierung von Extrusionswerkzeugen mit Finiten Elementen
Published in: Zeitschrift Kunststofftechnik = Journal of plastics technology (2009)
Profilwerkzeuge automatisch optimieren
Published in: Kunststoffe / Kunststoffe international (2009)
 

Contribution to a Book

Title
Mold-Based Production Systems
Published in: Integrative Production Technology - Theory and Applications / Christian Brecher, Denis Özdemir Editors (2017)
Modularisation for die-based production technologies
Published in: Integrative Production Technology for High-Wage Countries / edited by Christian Brecher (2012)
 

Contribution to a conference proceedings

Title
Deforming Domain Problems with Translational Movement: Flow Simulation inside a Packaging Machine
Published in: YIC 2017 : 4th ECCOMAS Young Investigators Conference and PhD Olympiad : 13 - 15 September 2017, Milano, Italy (2017)
Deforming-Domain Problems Related to Packaging Machines: Mesh-Update Method and Flow Simulation
Published in: 7th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry : Proceedings : 11 - 13 October 2017, Stuttgart, Germany / Editors: Malte von Scheven, Marc-André Keip, Nils Karajan (2017)
Simulation of Oil Jets for Piston Cooling Applications Using Mesh Deformation and the Level Set Method
Published in: 7th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry : proceedings ; a conference under the auspice of the German Association for Computational Mechanics (GACM) ; 11 - 13 October 2017, Stuttgart, Germany / Editors: Malte von Scheven, Marc-André Keip, Nils Karajan (2017)
Boundary-Conforming Space-Time Finite Elements for Co-Rotating Intermeshing Domains
Published in: 7th GACM Colloquium on Computational Mechanics for Young Scientists from Academia and Industry : proceedings ; a conference under the auspice of the German Association for Computational Mechanics (GACM) ; 11 - 13 October 2017, Stuttgart, Germany / Editors: Malte von Scheven, Marc-André Keip, Nils Karajan (2017)
Simulating Twin-Screw Extruders with Boundary Conforming Space-Time Finite Elements
Published in: [19h International Conference on Finite Elements in Flow Problems, FEF 2017, 2017-04-05 - 2017-04-07, Rome, Italy] (2017)
Predicting shrinkage and warpage in injection molding: Towards automatized mold design
Published in: PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY AND AWAM INTERNATIONAL CONFERENCE IN CIVIL ENGINEERING (IGNITE-AICCE’17): Sustainable Technology And Practice For Infrastructure and Community Resilience (2017)
A simplified simulation model for a HPDC die with conformal cooling channels
Published in: PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY AND AWAM INTERNATIONAL CONFERENCE IN CIVIL ENGINEERING (IGNITE-AICCE’17): Sustainable Technology And Practice For Infrastructure and Community Resilience (2017)
Schur Complement Based Preconditioning of the Stabilized Stokes Equations
Published in: [Joint DMV and GAMM Annual Meeting, GAMM DMV 2016, 07.03.2016-11.03.2016, Braunschweig, Germany] (2016)
Numerical Investigation of Rising Bubble Phenomena in Viscoelastic Fluids
Published in: [Joint Annual Meeting of GAMM and DMV, GAMM DMV 2016, 07.03.2016-11.03.2016, Braunschweig, Germany : abstracts] (2016)
Spline-Enhanced Finite Element Methods for Coupled Fluid Flow Problems
Published in: [GAMM DMV Jahrestagung, GAMM DMV 2016, 07.03.2016-11.03.2016, Braunschweig, Germany] (2016)
Spline-based methods for Interaction between Free-Surface Flows and Elastic Structures
Published in: [VII European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS, 05.06.2016-10.06.2016, Crete Island, Greece] (2016)
Spline-Based Finite Element Methods for Fluid Flow on Deforming Domains
Published in: [High-Order Finite Element and Isogeometric Methods 2016, HOFEIM2016, 30.05.2016-02.06.2016, Jerusalem, Israel] (2016)
Spline-based Fluid-Structure-Interaction for Sloshing Tanks
Published in: [VII European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS, 05.06.2016-10.06.2016, Crete Island, Greece] (2016)
Spline-based Finite Element Methods in Fluid-Structure-Interaction
Published in: [12th World Congress on Computational Mechanics and 6th Asia-Pacific Congress on Computational Mechanics, WCCM XII and APCOM VI, 24.07.2016-29.07.2016, Seoul, South Korea] (2016)
Simulating viscoelastic free-surface flows using an interface-tracking approach
Published in: [VII European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS, 05.06.2016-10.06.2016, Crete Island, Greece] (2016)
On the Simulation of Viscoelastic Free-Surface Flows
Published in: [12th World Congress on Computational Mechanics and 6th Asia-Pacific Congress on Computational Mechanics, WCCM 2016, 24.07.2016-29.07.2016, Seoul, South Korea] (2016)
An Interface-Tracking Approach to Viscoelastic Free-Surface Flows
Published in: [The XVIIth International Congress on Rheology, ICR 2016, 09.08.2016-13.08.2016, Kyoto, Japan] (2016)
Schur Complement Based Preconditioning of the Stabilized Stokes Equations
Published in: [5th European Trilinos User Group Meeting, 18.04.2016-20.04.2016, Garching, Germany] (2016)
Study on objective functions for the slow shot phase in high-pressure die casting
Published in: ESAFORM 2016 : proceedings of the 19th International ESAFORM Conference on Material Forming : Nantes, France, 27-29 April 2016 / editors: Francisco Chinesta, Elias Cueto, Emmanuelle Abisset-Chavanne; sponsoring organisations ESI Group ... - A (2016)
Numerical Optimization of the Phase Interface in High-Pressure Die Casting
Published in: 9th International Conferene on Multiphase Flow : May 22-27, Firenze, Italy : ICMV 2016 : Book of Abstracts (2016)
Die swell as an objective in the design of polymer extrusion dies
Published in: ESAFORM 2016 : proceedings of the 19th International ESAFORM Conference on Material Forming : Nantes, France, 27-29 April 2016 / editors: Francisco Chinesta, Elias Cueto, Emmanuelle Abisset-Chavanne; sponsoring organisations ESI Group ... - B (2016)
Free-Suface Flow Simulation with Space-Time Methods and Isogeometric Analysis
Published in: USACM Thematic Conference on Isogeometric Analysis and Meshfree Methods : Abstracts : (Part 2, M-Z) (2016)
Simulating Free-Surface Flows with Moving Boundaries : Combination of an Interface-Tracking and an Interface-Capturing Approach
Published in: Book of abstracts 2015 / 86th Annual Meeting of the International Association of Applied Mathematics and Mechanics March 23-27, 2015 Lecce, Italy (2015)
A new log-conformation formulation
Published in: 10th Annual European Rheology Conference : April 14-17, 2015 - Nantes, France (2015)
Using Automatic Differentiation to Create Sparse Jacobians for the Solution of Nonlinear Partial Differential Equations
Published in: Book of abstracts 2015 / 86th Annual Meeting of the International Association of Applied Mathematics and Mechanics March 23-27, 2015 Lecce, Italy (2015)
Efficient Jacobian calculation in a finite element software using automatic differentiation
Published in: Conference Proceedings of the YIC GACM 2015 / ed.: Stefanie Elgeti ; Jaan-Willem Simon (2015)
Simulation of rising bubbles in viscoelastic fluids
Published in: [3rd ECCOMAS Young Investigators Conference and 6th GACM Colloquium on Computational Mechanics, YIC GACM 2015, 20.07.2015-23.07.2015, Aachen, Germany] (2015)
NURBS-based Approaches in Fluid Flow Simulations
Published in: 86th Annual Meeting of the International Association of Applied Mathematics and Mechanics : March 23-27, 2015 : Lecce, Italy : book of abstracts - extract 2015 (2015)
Spline-Based Finite Element Methods in the Simulation of Deformable Sloshing Tanks
Published in: [Engineering Mechanics Institute Conference 2015, EMI2015, 16.06.2015-19.06.2015, Stanford, USA] (2015)
An Objective Function for the Slow Shot Phase in High-Pressure Die Casting
Published in: [3rd ECCOMAS Young Investigators Conference (YIC), YIC GACM, 20.07.2015-23.07.2015, Aachen, Germany] (2015)
Towards the Simulation of Deformable Sloshing Tanks with Spline-Based Methods
Published in: [3rd ECCOMAS Young Investigators Conference and 6th GACM Colloquium on Computational Mechanics, YIC GACM 2015, 20.07.2015-23.07.2015, Aachen, Germany] (2015)
The Nurbs-Enhanced Finite Element Method (NEFEM) for Free-Surface Flow Simulations
Published in: 11th World Congress on Computational Mechanics (WCCM XI) : 5th European Conference on Computational Mechanics (ECCM V) ; 6th European Conference on Computational Fluid Dynamics (ECFD VI) ; 20 - 25 July 2014, Barcelona, Spain (2014)
A Fully Implicit Log-Conformation Formulation
Published in: 11th World Congress on Computational Mechanics (WCCM XI) : 5th European Conference on Computational Mechanics (ECCM V) ; 6th European Conference on Computational Fluid Dynamics (ECFD VI) ; 20 - 25 July 2014, Barcelona, Spain (2014)
Development of an Objective Function for Die-Swell in Extrusion Die Design
Published in: [EngOpt 2014 : 4th International Conference on Engineering Optimization ; Lisbon, 8-11 September 2014 / IST – Instituto Superior Técnico University of Lisbon ...] (2014)
Comparing Optimization Algorithms for Shape Optimization of Extrusion Dies
Published in: Book of abstracts / 85th Annual Meeting of the International Association of Applied Mathematics and Mechanics : March 10 - 14, 2014, Erlangen / Gesellschaft für Angewandte Mathematik und Mechanik e. V. Local organizing committee: Paul Steinmann ... (2014)
Advanced Approaches for Shape Optimization : an Optimal Strategy for Shape Optimization of Extrusion Dies
Published in: Proceedings of the jointly organised 11th World Congress on Computational Mechanics (WCCM XI) : 5th European Conference on Computational Mechanics (ECCM V) ; 6th European Conference on Computational Fluid Dynamics (ECFD VI) ; Barcelona, Spain, July 20 - 25, 2014 / Eugenio Oñate ... (eds.). Organized by Spanish Association for Numerical Methods in Engineering (SEMNI) with the support of International Center for Numerical Methods in Engineering (CIMNE) / Sociedad Española de Métodos Numéricos en Ingeniería. Eugenio Oñate (2014)
The NURBS-Enhanced finite element method (NEFEM) for free-surface flow simulations
Published in: 5th GACM Colloquium on Computational Mechanics : Sept. 30th – Oct 2nd 2013 (2013)
Numerical Shape Optimization of Profile Extrusion Dies
Published in: [AC.CES 2011 : Aachen Conference on Computational Engineering Science ; July 13-15, 2011, RWTH Aachen, Germany / Aachen Institute for Advanced Study in Computational Engineering Science, RWTH Aachen] (2013)
Design Criteria in Numerical Design of Profile Extrusion Dies
Published in: Key engineering materials (2013)
Incorporating mesh properties in the Galerkin : Least-Squares stabilization parameters for flows of viscous and viscoelastic fluids
Published in: 8th Annual European Rheology Conference : April 2-5, 2013 - Leuven, Belgium (2013)
Werkzeugauslegung am Computer : Numerische Formoptimierung in der Profilextrusion
Published in: [Deutsche Kautschuk-Tagung, DKT 2012, 02.07.2012-05.07.2012, Nürnberg, Germany] (2012)
Comparing automated die optimisation with reality
Published in: Proceedings of the 27th Annual Meeting of the Polymer Processing Society Marrakesh, Marocco, 10.-14. Mai 2010 (2011)
Concept for die modularisation applied on profile extrusion
Published in: PPS-26 : Proceedings of the 26th Annual Meeting of the Polymer Processing Society ; July 4-8, 2010, Banff, Canada / General Chair: Uttandaraman Sundararaj (2010)
Shape Optimization for Fluids using T-Splines for Shape Representation
Published in: 81st Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), Karlsruhe 2010 / Ed: Christian Wieners (2010)
Shape Optimization and Sensitivity Analysis with Applications in Complex Fluids
Published in: Recent Advances in Optimization and its Applications in Engineering : The 14th Belgian-French-German Conference on Optimization / edited by Moritz Diehl, Francois Glineur, Elias Jarlebring, Wim Michiels (2009)
 

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