Veranstaltungen

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

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

Abstrakt
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.

Veranstalter
WIAS Berlin
Dienstag, 26.06.2018, 15:00 Uhr (WIAS-406)
Forschungsseminar Mathematische Statistik
Dr. A. Suvorikova, WIAS Berlin:
CLT in 2-Wasserstein space
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

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

Abstrakt
here

Veranstalter
WIAS Berlin
Humboldt-Universität zu Berlin
Freitag, 29.06.2018, 14:00 Uhr (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
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

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WIAS-Halbleiterseminar

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

Weitere Informationen
WIAS-Halbleiterseminar

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

Veranstalter
WIAS Berlin
Mittwoch, 04.07.2018, 15:15 Uhr (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
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
here

Weitere Informationen
Berliner Oberseminar “Nichtlineare Partielle Differentialgleichungen” (Langenbach Seminar)

Veranstalter
WIAS Berlin
Humboldt-Universität zu Berlin