Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
Date: Monday, 15/Mar/2021
1:30pm - 2:00pmOpening
Location: W001
2:00pm - 3:30pmPML: Prandtl Lecture
Location: W002
Session Chair: Martin Oberlack

On the spectrum of atmospheric motions

U. Schumann

DLR, Germany

Spectra of atmospheric motions describe the distribution of kinetic and potential energy as a function of scales. The spectrum of horizontal motions in the free troposphere and the lower stratosphere at horizontal scales from a few 10 m to several 1000 km has often been shown to follow a power law with logarithmic spectral slopes near -3 at large scales and near -5/3 at smaller scales. The motions are highly anisotropic. Inertial subrange turbulence occurs only occasionally. The horizontal spectrum of vertical velocity has been discussed relatively little. Vertical wind drives conversion between potential and kinetic energy, vertical fluxes, cloud formation and turbulence. This study started from measurements of velocity and temperature spectra in field campaigns investigating atmospheric dynamics over oceans and mountains with the DLR research aircraft HALO. Accurate measurements are demanding because the wind speed is often small compared to the aircraft speed. The measured spectrum of vertical velocity showed unexpected peaks at scales corresponding to the depth of the atmosphere. We discuss the Helmholtz decomposition of horizontal velocity in rotational and divergent velocity components. We then show that the horizontal spectrum of vertical velocity is kinematically connected to the spectrum of horizontal divergent motions. The observed peaks occur when the divergent motions are vertically coherent and when the horizontal spectrum of divergent velocity reaches spectral slopes larger than -2. Details can be found in a recent publication (J. Atmos. Sci., 2019, doi: 10.1175/JAS-D-19-0160.1). This lecture is dedicated to Ludwig Prandtl (1875-1953) who contributed fundamentally to fluid mechanics, including meteorology.

3:30pm - 4:30pmRvML 20/21 1
Location: W001
Session Chair: Ulisse Stefanelli
Session Chair: Paul Steinmann
4:30pm - 5:00pmB1: Coffee Break
5:00pm - 7:00pmYRM1: Algorithms for coupled multi-physics problems
Location: Z001
Session Chair: Matthias Mayr
Session Chair: Alexander Heinlein
5:00pm - 5:20pm

A unified Nitsche approach for fluid-structure interactions and contact

S. Frei1, E. Burman2, M. A Fernández3

1University of Konstanz, Germany; 2University College London, UK; 3Inria Paris, Sorbonne Université & CNRS, France

5:20pm - 5:40pm

Mixed-Dimensional Immersed Finite Element Approach for the Interaction of Submerged Fibers with Fluid Flow

N. Hagmeyer, M. Mayr, A. Popp

University of the Bundeswehr Munich, Germany

5:40pm - 6:00pm

Comparing Arterial Wall Models for the Curved Tube Fluid-Structure Interaction Benchmark

A. Heinlein1,2, A. Klawonn1,2, O. Rheinbach3

1Department of Mathematics and Computer Science, University of Cologne, Germany; 2Center for Data and Simulation Science, University of Cologne, Germany; 3Institute of Numerical Mathematics and Optimization, Technische Universität Bergakademie Freiberg, Germany

6:00pm - 6:20pm

Simulating sea ice drift in the Southern Ocean using the LSFEM.

C. Nisters, J. Schröder

Institute of Mechanics/ University of Duisburg-Essen, Germany

6:20pm - 6:40pm

Load balancing for dynamic contact problems on distributed memory architectures

M. Mayr, A. Popp

Universität der Bundeswehr München, Germany

6:40pm - 7:00pm

Purely hyperbolic self-gravitating flow simulations in Julia

M. Schlottke-Lakemper, A. R. Winters, H. Ranocha, G. J. Gassner

University of Cologne, Germany

5:00pm - 7:00pmYRM2: Rank structured matrix and tensor techniques
Location: Z002
Session Chair: Stefano Massei
Session Chair: Davide Palitta
5:00pm - 5:20pm

Low rank approaches for the analysis of biomedical data from pre to post processing

F. Esposito

University of Bari Aldo Moro, Italy

5:20pm - 5:40pm

Functional Tucker approximation using Chebyshev interpolation

S. Dolgov1, D. Kressner2, C. Strössner2

1University of Bath, United Kingdom; 2EPFL, Switzerland

5:40pm - 6:00pm

A matrix equation method for solving PDE-constrained optimization problems

A. Bünger1, M. Stoll1, V. Simoncini2

1TU Chemnitz, Germany; 2University of Bologna, Italy

6:00pm - 6:20pm

Compression properties and rank-structured solvers for Toeplitz, Vandermonde and related linear systems

H. D. Wilber1, D. Kressner2, B. Beckermann3

1Cornell University, United States of America; 2EPFL, Lausanne, Switzerland; 3Université de Lille, Lille, France

6:20pm - 6:40pm

Recycling subspaces for improved multidimensional alternating minimal energy solver

H. Al Daas, P. Benner, P. Jolivet, J. Saak

STFC, Rutherford Appleton Laboratory

5:00pm - 7:00pmYRM3: Recent developments in Isogeometric Analysis for Flow Problems
Location: Z003
Session Chair: Philipp Morgenstern
Session Chair: Andreas Apostolatos
5:00pm - 5:20pm

Adaptive isogeometric methods with inexact solvers

G. Gantner, A. Haberl, D. Haberlik, D. Praetorius, S. Schimanko

University of Amsterdam, Netherlands, The

5:20pm - 6:00pm


T. Spenke, N. Hosters, M. Behr

RWTH Aachen University, Germany

6:00pm - 6:20pm

Mesh refinement for rate-optimal unstructured AS T-splines

R. Maier2, P. Morgenstern1, T. Takacs3

1Institute of Applied Mathematics, Leibniz Universität Hannover, Germany; 2Institute of Mathematics, Universität Augsburg; 3Institute of Applied Geometry, Johannes Kepler University Linz

6:20pm - 6:40pm

C1 Isogeometric discretizations over multi-patch domains

M. Kapl2, G. Sangalli3, T. Takacs1

1Johannes Kepler University Linz, Austria; 2RICAM, ÖAW, Austria; 3University of Pavia, Italy

5:00pm - 7:00pmYRM4: Modelling, simulation and data-driven analysis of molecular systems
Location: Z004
Session Chair: Feliks Nüske
5:00pm - 5:20pm

Discovery of complex reaction coordinates in autonomous artificial intelligence-guided computer simulations

R. Covino1, H. Jung1, G. Hummer1,2

1Department of Theoretical Biophysics, Max Planck Institute of Biophysics, Frankfurt am Main,Germany; 2Institute of Biophysics, Goethe-University, Frankfurt am Main, Germany

5:20pm - 5:40pm

Parareal algorithm in the context of Molecular Dynamics

U. Sharma1, F. Legoll2, T. Lelièvre3

1Freie Universität Berlin; 2Ecole des Ponts ParisTech; 3Ecole des Ponts ParisTech

5:40pm - 6:00pm

The role of the lag time in spectral estimation for Markov processes

E. H. Thiede1, R. J. Webber2, D. Dow1, A. R. Dinner1, J. Weare2

1University of Chicago, United States of America; 2Courant Institute of Mathematical Sciences, New York University, United States of America

6:00pm - 6:20pm

Tensor-based EDMD for the Koopman analysis of high-dimensional systems

F. Nüske1, P. Gelß2, S. Klus2, C. Clementi3

1Universität Paderborn, Germany; 2Freie Universität Berlin, Germany; 3Rice University, USA

5:00pm - 7:00pmYRM5: Complexity Reduction in Optimal Control
Location: Z005
Session Chair: Silke Manuela Glas
Session Chair: Carmen Gräßle
5:00pm - 5:20pm

Reduced basis methods for quasilinear elliptic PDEs with applications to permanent magnet synchronous motors

D. Korolev

Koblenz-Landau university, Germany

5:20pm - 5:40pm

ROM-based inexact subdivision methods for PDE-constrained multi objective optimization

S. Banholzer1, B. Gebken2, L. Reichle1, S. Volkwein1

1Universität Konstanz, Germany; 2Universität Paderborn

5:40pm - 6:00pm

Reduced Order Models for the Planning of Thermal Cancer Treatments

Z. Tokoutsi1, M. Grepl2, K. Veroy3, M. Baragona1, R. Maessen1

1Philips, Netherlands, The; 2IGPM, RWTH Aachen University, Germany; 3AICES, RWTH Aachen University, Germany

6:00pm - 6:20pm

Finite element approximation of second-order PDEs in non-divergence form in the solution of Hamilton-Jacobi-Bellman equations

J. Blechschmidt, R. Herzog, M. Winkler

TU Chemnitz, Germany

6:20pm - 6:40pm

A-posteriori reduced basis error-estimates for a semi-discrete in space quasilinear parabolic PDE

F. Hoppe, I. Neitzel

Rheinische Friedrich-Willhelms-Universität Bonn, Germany

5:00pm - 7:00pmYRM6: Novel discretization methods for phase-field modeling in fracture mechanics
Location: Z006
Session Chair: Fleurianne Bertrand
5:00pm - 5:20pm

Stress reconstructions for quasi-static phase-field fractures

F. Bertrand

Humboldt-Universität zu Berlin, Germany

5:20pm - 5:40pm

Solving a phase-field fracture problem in mixed form

T. Heister1, K. Mang2, T. Wick2

1Clemson University, South Carolina; 2Leibniz Universität Hannover, Germany

5:40pm - 6:00pm

Extension of the phase-field model to anisotropic pressurized fracture

C. Bilgen, M. Werner, K. Weinberg

Universität Siegen, Germany

6:00pm - 6:20pm

Observation and viscoelastic modeling of tidal displacements at 79°N Glacier, Greenland

J. Christmann1,2, O. Zeising1, D. Steinhage1, N. Neckel1, V. Helm1, R. Müller2, M. Scheinert3, S. A. Khan4, A. Humbert1,5

1Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; 2TU Kaiserslautern, Kaiserslautern, Germany; 3TU Dresden, Dresden, Germany; 4Technical University of Denmark, Lyngby, Dänemark; 5University of Bremen, Bremen, Germany

6:20pm - 6:40pm

A coupled multi-phase/-scale numerical description for solidification processes of steel, using a phase-field model for phase-transformation

C. Henning, T. Ricken

Institute of Mechanics, Structural Analysis and Dynamics of Aerospace Structures, University of Stuttgart, Germany

6:40pm - 7:00pm

An anisotropic phase-field model for fracture based on a decomposition of the material tangent

C. Luo

Tongji University, China