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June 25 – 27, 2018 (TU-H2036)
Workshop/Konferenz: Interplay of Random Media and Stochastic Interface Models (RMSI2018)
more ... Location
Technische Universität, Straße des 17. Juni 135, 10623 Berlin, Main building, Room H 2036

Host
Technische Universität Berlin
Tuesday, 26.06.2018, 13:30 (WIAS-ESH)
Seminar Numerische Mathematik
Prof. T. Iliescu, Virginia Tech, USA:
Physically-constrained data-driven correction for reduced order modeling of fluid flows
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
We propose a data-driven correction reduced order model (DDC-ROM) framework for the numerical simulation of fluid flows, which can be formally written as DDC-ROM = Galerkin-ROM + Correction. The new DDC-ROM is constructed by using ROM spatial filtering and data-driven ROM closure modeling (for the Correction term). Furthermore, we propose a physically-constrained DDC-ROM (CDDC-ROM), which aims at improving the physical accuracy of the DDC-ROM. The new physical constraints require that the CDDC-ROM operators satisfy the same type of physical laws (i.e., the Correction term's linear component should be dissipative and the Correction term's nonlinear component should conserve energy) as those satisfied by the fluid flow equations. To implement these physical constraints, in the data-driven modeling step, we replace the unconstrained least squares problem with a constrained least squares problem. We perform a numerical investigation of the new CDDC-ROM and standard DDC-ROM for a 2D channel flow past a circular cylinder at Reynolds numbers Re=100, Re=500, and Re=1000. To this end, we consider a reproductive regime as well as a predictive (i.e., cross-validation) regime in which we use as little as 50 % of the original training data. The numerical investigation clearly shows that the new CDDC-ROM is significantly more accurate than the DDC-ROM in both regimes.

Host
WIAS Berlin
Tuesday, 26.06.2018, 15:00 (WIAS-406)
Forschungsseminar Mathematische Statistik
Dr. A. Suvorikova, WIAS Berlin:
CLT in 2-Wasserstein space
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Host
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin
Wednesday, 27.06.2018, 15:15 (WIAS-ESH)
Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Prof. Dr. L. Berlyand, Pennsylvania State University, USA:
Free boundary PDE models of active gels
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
here

Host
WIAS Berlin
Humboldt-Universität zu Berlin
Friday, 29.06.2018, 14:00 (WIAS-ESH)
Halbleiterseminar
Prof. Dr. M. Willatzen, Technical University of Denmark, Dänemark:
Strain and symmetry effects in Bi2Se3 thin films using the k·p method
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Further Informations
WIAS-Halbleiterseminar

Host
WIAS Berlin
Friday, 29.06.2018, 14:30 (WIAS-ESH)
Halbleiterseminar
Dr. M. Caro, Aalto University, Finnland:
Growth of amorphous carbon simulated with a machine-learning based interatomic potential
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Further Informations
WIAS-Halbleiterseminar

Host
WIAS Berlin
Tuesday, 03.07.2018, 15:00 (WIAS-406)
Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Dr. P. Pigato, WIAS Berlin:
Asymptotic analysis of rough volatility models
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Host
WIAS Berlin
Wednesday, 04.07.2018, 15:15 (WIAS-ESH)
Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Dr. J. Mankau, Technische Universität Dresden:
A descent step algorithm based on generalized gradients on sets
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
here

Further Informations
Berliner Oberseminar “Nichtlineare Partielle Differentialgleichungen” (Langenbach Seminar)

Host
WIAS Berlin
Humboldt-Universität zu Berlin