Zur Hauptnavigation / To main navigation

Zur Sekundärnavigation / To secondary navigation

Zum Inhalt dieser Seite / To the content of this page

Hauptnavigation / Main Navigation

Sekundärnavigation / Secondary navigation

Event calendar

Inhaltsbereich / Content

<< May 2018

Event Calendar June 2018

July 2018 >>
Category:

13 entries found

Page 1 of 2 12 >>

  • 04. June - 05. June

    Modellierungstage

    Category: KOMMS

    Segwaymodellierungsprojekt am Gymnasium am Weierhof, Kirchheim-Bolanden.

  • 07. June
    11:30 - 13:15
    Location: 32-349
    http://www.scicomp.uni-kl.de

    Prof. Martin Geier, IRMB, TU Braunschweig: Aero-acoustical simulations with the lattice Boltzmann method

    The lattice Boltzmann method for fluid mechanics has recently been improved concerning stability and accuracy by the application of a cumulant transform [1], by the use of quadric relaxation rates [2][3] and fourth order accurate advection [4]. At the same time, the method retains its geometrical flexibility, enabling us to simulate turbulent flow over and in fully resolved porous media [5]. Porous media is expected to play a key role in the reduction of airfoil noise in future commercial aircraft. The cumulant lattice Boltzmann method enables us to simulate the flow around the airfoil with porous edge and its acoustics together. In order to demonstrate the acoustic abilities of the lattice Boltzmann method we also present an auralization of an organ pipe simulation.

    [1] Geier, Martin, et al. “The cumulant lattice Boltzmann equation in three dimensions: Theory and validation.” Computers & Mathematics with Applications 70.4 (2015): 507-547.
    [2] Geier, Martin, Andrea Pasquali, and Martin Schönherr. “Parametrization of the cumulant lattice Boltzmann method for fourth order accurate diffusion part I: Derivation and validation.” Journal of Computational Physics 348 (2017): 862-888.
    [3] Geier, Martin, Andrea Pasquali, and Martin Schönherr. “Parametrization of the cumulant lattice Boltzmann method for fourth order accurate diffusion Part II: Application to flow around a sphere at drag crisis.” Journal of Computational Physics 348 (2017): 889-898.
    [4] Geier, Martin, and Andrea Pasquali. “Fourth order Galilean invariance for the lattice Boltzmann method.” Computers & Fluids 166 (2018): 139-151.
    [5] Kutscher, Konstantin, Martin Geier, and Manfred Krafczyk. “Multiscale simulation of turbulent flow interacting with porous media based on a massively parallel implementation of the cumulant lattice Boltzmann method.” Computers & Fluids (2018).

  • 07. June
    16:30 - 17:30
    Location: 48-436
    AG Algebra, Geometrie und Computer Algebra

    Ipek Tuvay, Mimar Sinan Fine Arts University, Istanbul: Brauer indecomposability of Scott modules for the quadratic group Qd(p

    Brauer indecomposability of Scott modules is important for constructing stable equivalences of Morita type between the principal blocks of two different finite groups. For an algebraically closed field k of prime characteristic p, we compute the Scott kG-module with vertex P when F is a constrained fusion system on P and G is Park’s group for F. In the case F is a fusion system of the quadratic group on a Sylow p-subgroup P of Qd(p) and G is Park’s group for F, we prove that the Scott kG-module with vertex P is Brauer indecomposable. In this talk these results will be presented. This is a joint work with Shigeo Koshitani.

  • 07. June
    17:30 - 18:30
    Location: 48-436
    AG Algebra, Geometrie und Computer Algebra

    Kivanc Ersoy, Freie Universität Berlin: Groups with certain conditions on fixed points of automorphisms

    Thompson proved that a finite group with a fixed point free automorphism of prime order is nilpotent. Later Higman, Kreknin and Kostrikin proved that in this case the nilpotency class is indeed bounded by the order of the automorphism. On the other hand, Brauer and Fowler proved that order of a finite simple group is indeed bounded in terms of the order of centralizers of involutions. Since then, there has been a lot of questions of the following type: Let G be a group with a particular type of centralizer (of fixed point set). How does the structure of the centralizer affect the structure of the group? In the first part of the talk we will give a survey of results obtained by imposing certain conditions on the centralizers. In the second part we will prove new results about finite and locally finite groups and their automorphisms.

  • 10. June - 15. June

    Modellierungswoche

    Category: KOMMS

    Modellierungswoche für Schülerinnen und Schüler, Lehrkräfte und Referendarinnen und Referendare in der Jugendherberge Traben-Trarbach.

  • 11. June - 12. June

    Modellierungstag

    Category: KOMMS

    Segwaymodellierungsprojekt an der BBS Wissen.

  • 12. June
    17:15 - 18:30
    Location: Geb. 48-210
    Fachbereich Mathematik

    Prof. Dr. Henryk Zähle, Universität des Saarlandes, "On the property of qualitative robustness of statistical point estimators"

    A point estimator is a tool which assigns to each sample (data set) an estimated value of the aspect of interest of the unknown distribution of the data. An estimator is considered qualitatively robust when small changes in the distribution of the data result only in small changes of the distribution of the estimator. After an introduction into statistical models and point estimators I will recall the classical notion of qualitative robustness originated by F. Hampel in the 1970th. Hampel considers qualitative robustness as a global property. This generates a sharp division of estimators into those that are called "robust"' and others that are called "not robust"'. In the last part of the talk I will discuss a recent refinement of Hampel's terminology where qualitative robustness is considered as a local property. I will explain why it can be beneficial to know the sets of relevant distributions on which qualitative robustness holds, and I will present some criteria and examples. This final part is based on joint work with V. Krätschmer (U Duisburg--Essen) and A. Schied (U Waterloo). 
  • 14. June
    15:00 - 16:15
    Location: 32-349
    http://www.scicomp.uni-kl.de

    Prof. Siegfried Müller, IGPM, RWTH Aachen University: Effective Boundary Conditions for Compressible Flows over Rough Boundaries

    This is joint work with Dr. Giulia Deolmi and Prof. Wolfgang Dahmen.

    Simulations of a flow over a roughness are prohibitively expensive for small scale structures.​ ​If the interest is only on some macroscale quantity it will be sufficient to model the influence of the unresolved microscale effects. Such multiscale models rely on an appropriate upscaling strategy. ​In this talk the strategy originally developed by Achdou et al. [1] for incompressible flows is extended to compressible high-Reynolds number flow. For proof of concept a laminar flow over a flat plate with partially embedded roughness is simulated​ and the results are compared with computations on a rough domain [2,3].

    [1] Y. Achdou, O. Pironneau, F. Valentin, Eff ective boundary conditions for laminar flows over periodic rough boundaries, J. Comp. Phys., 147, 187–218, 1998.
    [2] G. Deolmi, W. Dahmen, S. Müller, Effective boundary conditions for compressible flows over rough boundaries, Mathematical Models and Methods in Applied Sciences, 25(7), 1257-1297, 2015.
    [3] G. Deolmi, W. Dahmen, S. Müller, Effective boundary conditions: a general strategy and application to compressible flows over rough boundaries, Communications in Computational Physics, 21(2), 358–400, 2017.

     

     

     

  • 14. June
    17:00 - 18:00
    Location: 48-436
    AG Algebra, Geometrie und Computer Algebra

    Iulian Simion, Babes-Bolyai University, Cluj: Minimal realizations of finite groups of isometries

    Let G be a finite group. The minimal dimension in which G can be realized by isometries is known to be the dimension of a minimal faithful real representation. The minimal number of points which realize the group as their full group of isometries appears to be less well-understood. We discuss some known bounds (this is work in progress).

  • 20. June - 21. June

    Modellierungstage

    Category: KOMMS

    Modellierungstage am Albert-Schweitzer-Gymnasium Kaiserslautern.

Page 1 of 2 12 >>