Dokumente Fakultät für Mathematik und Informatik (inkl. GAUSS) nach Gutachter "Lube, Gert Prof. Dr."
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A Chimera simulation method and Detached Eddy Simulation for vortex-airfoil interactions
(2011-01-25)The present thesis introduces, verifies and validates a numerical simulation method based on an overset grid (or Chimera) technique that allows to simulate the generation and transport ... -
A Grid-Adaptive Algebraic Hybrid RANS/LES Method
(2016-04-04)The present thesis considers the compressible Navier-Stokes equations to simulate the flow of air about basic and complex test cases. As numerical solution method the unstructured finite-volume solver DLR-TAU is used. The ... -
A Massively Parallel Finite Element Framework with Application to Incompressible Flows
(2011-05-13)The incompressible Navier-Stokes equations describe the flow of Newtonian fluids or gases. They are used in many numerical simulations of flow problems. These simulations have become an ... -
Almost sure behavior for increments of U-statistics
(2007-10-09)This thesis is concerned with a new type of almost sure behavior which was introduced by Erdös and Renyi. They found that the maxima of partial sums of independent and identically distributed ... -
Analytic singularities near radial points
(2015-03-11)In this thesis, we applied tools of algebraic analysis and knowledge of symplectic geometry and contact geometry to give a normal form of certain class of microdifferential operators, and then studied analytic singularities of ... -
Analytische und numerische Untersuchung von direkten und inversen Randwertproblemen in Gebieten mit Ecken mittels Integralgleichungsmethoden
(2002-01-11)We consider inverse boundary value problems for the Helmholtz and Laplace equations in domains with corners. This thesis has three main parts. The first one gives the functional ... -
Analytische und numerische Untersuchungen bei inversen Transmissionsproblemen zur zeitharmonischen Wellengleichung
(2001-05-25)Scattering theory deals with a scattering object´s effect that on an incident wave. In this context the time-harmonic wave equation is a mathematical model for the scattering of acoustic ... -
CUDA-based Scientific Computing
(2013-02-12)The first goal of this thesis is the design of SciPAL (Scientific and Parallel Algorithms Library), a C++-based and operating-system-independent library. The core of SciPAL is a domain-specific embedded language for dense ... -
Finite Element Methods with Local Projection Stabilization for Thermally Coupled Incompressible Flow
(2015-09-15)This thesis considers conforming finite element discretizations for the time-dependent Oberbeck-Boussinesq model with a pressure-correction projection scheme of second order in time. Discrete inf-sup stability of the ansatz ... -
Finite-element simulation of buoyancy-driven turbulent flows
(2003-08-25)Turbulent flows driven or significantly affected by buoyancy occur in a variety of problems including building ventilation, cooling of electrical equipment, and environmental science. The ... -
Eine Finite-Elemente-Methode für nicht-isotherme inkompressible Strömungsprobleme
(2011-10-31)In this thesis, various aspects of the implementation of a solver for turbulent non-isothermal incompressible flow problems are considered. This includes in particular a spatial discretization ... -
Ein Gebietszerlegungsverfahren für parabolische Probleme im Zusammenhang mit Finite-Volumen-Diskretisierung
(2007-12-03)The first part of the thesis at hand deals with a finite volume method for time-dependent advection-diffusion-reaction equations. By using dual control volumes based on a common ... -
GPU fast multipole method with lambda-dynamics features
(2021-11-11)A significant and computationally most demanding part of molecular dynamics simulations is the calculation of long-range electrostatic interactions. Such interactions can be evaluated directly by the naïve pairwise summation ... -
High-order Unfitted Discretizations for Partial Differential Equations Coupled with Geometric Flow
(2023-02-17)We consider a moving free boundary problem where a diffusion equation posed on an evolving domain bounded by a smooth surface is coupled with a mean curvature flow of the bounding surface. The evolution velocity of the ... -
Identification of model and grid parameters for incompressible turbulent flows
(2007-10-24)The present thesis studies the behavior of turbulence models for incompressible flows based on the DLR-THETA-code and calibrates relevant model and grid parameters arising in the numerical ... -
Komplexität und Stabilität von kernbasierten Rekonstruktionsmethoden
(2009-03-19)We are looking at functions $f : \mathbb{R}^d → \mathbb{R}$ and reconstruct them by $f (x) =\sum_{j=1}^N \alpha_j K(x,x_j)$, where $K$ is a positive definite, symmetric kernel, $x_j \in \mathbb{R}^d , \alpha_j \in \mathbb{R}$.In ... -
Membrane locking in discrete shell theories
(2012-05-23)This work is concerned with the study of thin structures in Computational Mechanics. This field is particularly interesting, since together with traditional finite elements methods (FEM), the last years have seen the ... -
Modellierung turbulenter Strömungen mit Anwendungsfällen in der Bioklimatologie und Astrophysik
(2014-02-06)When on the photo above the west wind Zephyr and in his arms the morning breeze Aura is not floating Venus on the shores of Cyprus , but instead blows out the birthday cake , then his breathing is what is known in fluid ... -
Numerical Simulation of Bloch Equations for Dynamic Magnetic Resonance Imaging
(2017-03-21)With recent advancements of image reconstruction techniques, magnetic resonance imaging (MRI) can produce real-time images at a temporal resolution of 10 to 40 ms to observe complex physiological processes and also serves ... -
On Collective Communication and Notified Read in the Global Address Space Programming Interface (GASPI)
(2017-03-28)In high performance computing (HPC) applications, scientific or engineering problems are solved in a highly parallel and often necessarily distributed manner. The distribution of work leads to the distribution of data ...