Lennart Risthaus

M.Sc.Lennart Risthaus

Scientific Employee

Contact

Room: V15 R04 H17 (Directions)
Tel.: +49 201 - 183 7273
lennart.risthaus@uni-due.de

Address

Universität Duisburg-Essen
Abteilung Bauwissenschaften
Institut für Ingenieurmathematik
Universitätsstr. 2
45141 Essen
V15 R04 H17

Courses

Summer Term 24

Exercises and tutorials for Mathematik 2 für Bauwissenschaften

Winter Term 23/24

Exercises and tutorials for Mathematik 1 für Bauwissenschaften

Research Topic

FFT-based homogenization in micromechanics

Publications

    2025

  • Risthaus, Lennart; Schneider, Matti
    Robust and Efficient FFT-Based Solvers for Unit-Cell Problems With Voids and Pores Under Displacement Boundary Conditions
    In: International Journal for Numerical Methods in Engineering, Vol. 126, 2025, Nr. 18, e70124
    DOI, Online Full Text (Open Access)

    • 2024

  • Risthaus, Lennart; Schneider, Matti
    Dirichlet Boundary Conditions for FFT‐Based Micromechanics of Bicontinuous Stochastic Microstructures
    In: Proceedings in Applied Mathematics and Mechanics (PAMM), Vol. 24, 2024, Nr. 4, e202400182
    DOI, Online Full Text (Open Access)
  • Risthaus, Lennart; Schneider, Matti
    FFT-based computational micromechanics with Dirichlet boundary conditions on the rotated staggered grid
    In: International Journal for Numerical Methods in Engineering, Vol. 125, 2024, Nr. 21, e7569
    DOI, Online Full Text (Open Access)
  • Risthaus, Lennart; Schneider, Matti
    Imposing different boundary conditions for thermal computational homogenization problems with FFT- and tensor-train-based Green's operator methods
    In: International Journal for Numerical Methods in Engineering, Vol. 125, 2024, Nr. 7, e7423
    DOI (Open Access)
  • Risthaus, Lennart; Schneider, Matti
    Imposing Dirichlet boundary conditions directly for FFT-based computational micromechanics
    In: Computational Mechanics, Vol. 74, 2024, Nr. 5, pp. 1089 – 1113
    DOI, Online Full Text (Open Access)

    • 2023

  • Risthaus, Lennart; Schneider, Matti
    Solving phase‐field fracture problems in the tensor train format
    GAMM: 92nd Annual Meeting, 15.-19.08.2022, Aachen,
    In: Proceedings in Applied Mathematics and Mechanics (PAMM), Vol. 22, 2023, Nr. 1, Heft 1, Special Issue: 92nd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), e202200098
    DOI (Open Access)

    • 2022

  • Risthaus, Lennart; Schneider, Matti
    Solving phase-field models in the tensor train format to generate microstructures of bicontinuous composites
    In: Applied Numerical Mathematics, Vol. 178, 2022, pp. 262 – 279
    DOI

Talks

2024

L. Risthaus, M. Schneider:
FFT-based computational micromechanics with essential boundary conditions, 94th GAMM Annual Meeting, Magdeburg, Germany, 18.-22.03.2024

2023

L. Risthaus, M. Schneider:
Assessing the Effectiveness of Tensor-Train-Based Preconditioners For Numerical Homogenization, ECCOMAS 7th Young Investigators Conference, Porto, Portugal, 19.-21.06.2023

L. Risthaus, M. Schneider:
Computational Homogenization With Tensor-train-based Preconditioners,  XVII International Conference on Computational Plasticity, COMPLAS, Barcelona, Spain, 5.-7.09.2023

2022

L. Risthaus, M. Schneider:
Generating microstructures of bicontinuous composites in the tensor train format, 92nd GAMM Annual Meeting, Aachen, Germany, 15.-19.04.2022 

L. Risthaus, M. Schneider:
A Low-rank Approach to Generating Bicontinuous Microstructures: Performance and Effective Properties, 9th GACM Colloquium on Computational Mechanics, Essen, Germany, 21.-23.09.2022 

L. Risthaus, M. Schneider:
Using a Low-Rank Approach to Solve Phase-Field Fracture Problems, 8th GAMM AG Data Workshop, online, 19.10.2022    

Curriculum Vitae

10/2014–04/2018 Bachelor Mechanical Engineering (BSc.), with major Continuum Mechanics, Karlsruhe Institute of Technology (KIT)
10/2017–12/2017  Internship at Reden B.V., Hengelo, Netherlands, Finite Element Simulations of Additive Manufacturing
01/2018–04/2018 Bachelor Thesis at Reden B.V., Hengelo, Netherlands
05/2018–01/2021 Master Mechanical Engineering (MSc.) with majors Medical Technology and Applied Mechanics, Karlsruhe Institute of Technology (KIT)
08/2018–01/2019 Erasmus exchange student at the Royal Institute of Technology (KTH), Stockholm, Sweden
08/2019–05/2020 Working student at Admedes GmbH, Pforzheim, Department: Simulation and Testing
02/2021–08/2023 Scientific Employee, Institute of Engineering Mechanics, Chair for Continuum Mechanics, Karlsruhe Institute of Technology (KIT), Germany
Since 09/2023 Scientific Employee, Institute of Engineering Mathematics, University of Duisburg-Essen