Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 30 for “"Numerische Strömungssimulation"”.
-
Automatisierte Geometrieaufbereitung digitaler 3D-Stadtmodelle für die Strömungssimulation
… Selbstverschneidungen) oder auch für eine numerische Simulation unvorteilhafte Eigenschaften aufweisen (z. B. zu kleine Flächen). Weiterhin kann das Modell in einer für die Simulation ungeeigneten Repräsentationsform vorliegen, was eine Konvertierung der Daten notwendig macht. Das führt …
-
Modeling and simulation of dispersed two-phase flow transport phenomena in electrochemical processes
Modeling the physics of two-phase flows and the development of numerical tools for their simulation are important challenges in modern CFD. Contrary to single-phase flows, where the underlying physics is quite well understood and relatively general numerical methods can be employed in flow …
-
Erschließung der automatischen Strömungsoptimierung zur Lösung von Gestaltungsaufgaben im Wasserbau
Today, numerical flow models are widely used tools in hydraulic engineering, as for the design of turbine intakes. In this field, problems are often closely linked to the question of an optimal solution depending on various influences. With the connection of an optimization algorithm and a flow …
-
Eine numerische Methode zur Bestimmung erweiterter flugdynamischer Derivativa durch aerostrukturdynamische Simulation
Starting from a Finite-Volume Method solving the Navier-Stokes equations for compressible fluid flow and a Finite-Element Method based on quasi one-dimensional Timoshenko beam elements for structural dynamics, a numerical method for coupled aeroelastic problems of flight vehicles is developed. …
-
Kopplungswerkzeuge für aeroelastische Simulationen
The direct numerical simulation of fluid-structure-interaction has received a lot of attention in recent years. Due to the growing size of planned commercial airplanes and the widespread use of lightweight-structures leading to large elastic deflections in flight, great interest of commercial …
-
Widerstandsverteilung in Schaltlichtbögen von Selbstblasleistungsschaltern während der Stromnulldurchgangsphase
SF6 self-blast circuit breakers are widely used as switching elements in electrical power systems. In case of a short-circuit fault the breaker contacts are separated leading to an ignition of an electric arc. Hence, the current flow is carried by the electric arc itself. Due to a cooling of the …
-
Efficient indexing and view dependent ranking in CFD databases
Methods numerically simulating the interaction of gases or fluids with complex surfaces (computational fluid dynamics, CFD) are able to perform calculations with increasing levels of detail due to the ongoing development of more powerful computers. CFD simulations are utilized during the design of …
-
Unstructured h-adaptive finite volume schemes for compressible viscous fluid flow
The current thesis presents a novel methodology for solving the Euler and Reynolds-averaged Navier-Stokes equations for compressible fluid flow. The central objective of the presented research is to realize adaptively generated discretizations that are able to resolve the physically relevant …
-
Experimental and numerical investigation of flameless pulverised coal combustion
Aim of this work was to investigate the applicability of flameless combustion technology principles to pulverised coal combustion. Lab-scale experiments showed, that it is highly beneficial in terms of NOx reduction to use N2 as coal carrier instead of air. The finding has been supported by OH* …
-
Bedarfsorientierte Raumwärmeversorgung durch dynamische Elektroflächenheizsysteme
This thesis deals with the valuation of heating systems with respect to providing heat in rooms based on the momentary need. Due to the temporal and local changes in the room temperature there are unavoidable effects of overheating, whose kind and size significantly depend on the current heating …
-
Dreidimensionale Simulation und Visualisierung von Strömungs- und Mischprozessen im Doppelschneckenextruder
The mixing behaviour of new material systems (PES/glass- and PP/metal-blends) is studied in dependence of the process parameters screw-speed, material type and non-polymer rate in the present dissertation. The glass and the metal are low melting materials and they are processed in a fluid state. …
-
Zur Strömungssimulation in Einzelklüften: Gegenüberstellung von numerischen Methoden und Experiment
Scientific research in the field of flow and transport processes in fractured rock is of high relevance due to the frequent occurrence of fractures in geological formations. For this reason, fracture flow problems are addressed in many fields of engineering tasks. Based on results of numerical …
-
High-order well-balanced finite volume schemes for geophysical flows : development and numerical comparisons
Many geophysical flows are merely perturbations of some fundamental equilibrium state. If a numerical scheme shall capture such flows efficiently, it should be able to preserve the unperturbed equilibrium state at the discrete level. In the first part of this thesis we present a class of schemes of …
-
Über die gekoppelte 1D- und 2D-Modellierung von Fließgewässern und Überflutungsflächen
Experiences from recent flooding events dramatically illustrated limitations of existing flood protection and pointed toward the necessity for more sophisticated preventive technology. To date the design flood concept does not offer comprehensive protection. With growing size of critical river …
-
High-order methods for convection dominated nonlinear problems using multilevel techniques
For industrial aerodynamic applications to compressible flow simulation, finite volume methods with low order of consistency are a mature technology, usually combined with shock capturing techniques. However, high accuracy is needed for those problems which involve a wide range of spatial and …
-
Combustion modeling for diesel engine control design
This thesis deals at first with the development of a consistent mixing model for the interactive coupling (two-way-coupling) of a CFD code and a multi-zone code based on multiple zero-dimensional reactors. The interactive coupling allows for a computationally efficient modeling of HCCI or PCCI …
Page 1 of 2