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The design of technical combustion systems demands efficient as well as precise models correctly predicting the interaction of turbulence and combustion. Main focus of this work is to develop and evaluate turbulent combustion models applicable for the simulation of modern lean combustion concepts using gaseous or liquid fuels. Within this work these models are both validated on model flames and applied to technical systems.
CFD --- Verbrennungstechnik --- Brennkammer --- Reaktionsmodellierung --- Turbulenz
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Mit der Motivation, einen strömungsmechanischen Beitrag zur Planung und Bewertung von Herzoperationen zu leisten, wurde am Institut für Strömungslehre das Karlsruhe Heart Model (KaHMo) entwickelt. Ziel dieser Arbeit war die abschließende Entwicklung des KaHMo-MRT hin zu einem einsatzfähigen Modell für die klinische Anwendung. Im Fokus standen hierbei die Modellierung des Vorhofs sowie die Validierung der linken Herzkammer.
CFD --- patientenspezifisch --- Vorhof --- virtuelles Herz --- Validierung
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Diese Arbeit befasst sich mit der numerischen Modellierung von monolithischen Autoabgaskatalysatoren unter Berücksichtigung verschiedener Transportmodelle in Gasphase und poröser Washcoatschicht sowie heterogener Reaktionsmechanismen, die auf Elementarreaktionen aufbauen. Hierbei wird der Einfluss mehrerer Modellparameter auf die Schadstoffumsätze im Katalysator mit Hilfe des Softwarepakets zur Simulation reaktiver Strömungen DETCHEM untersucht.
CFD --- DETCHEM --- numerische Simulation --- Autoabgaskatalyse --- reaktive Strömungen
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The characteristic vortex formation in the ventricles is believed to be affected at an early stage of heart diseases. First, post-processing of patient-specific data has to be standardised. The chosen methods, a combination of Eulerian and Lagrangian techniques, are characterised by means of necessary spatial and temporal resolutions. Second, the goal is to find the best cost-benefit approach for modelling of the mitral valve, as it affects vortex formation and progression in the left ventricle.
CFD --- vortex identification --- mitral valve --- WIrbelidentifikation --- Mitralklappe
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The Smoothed Particle Hydrodynamics (SPH) method is proposed for studying hydrodynamic processes related to nuclear engineering problems. A problem of possible recriticality due to the sloshing motions of the molten reactor core is studied with SPH method. The accuracy of the numerical solution obtained in this study with the SPH method is significantly higher than that obtained with the SIMMER-III/IV reactor safety analysis code.
CFD --- Sloshing --- Recriticality --- SPH --- Free Surface Flows
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The Smoothed Particle Hydrodynamics (SPH) method is proposed for studying hydrodynamic processes related to nuclear engineering problems. A problem of possible recriticality due to the sloshing motions of the molten reactor core is studied with SPH method. The accuracy of the numerical solution obtained in this study with the SPH method is significantly higher than that obtained with the SIMMER-III/IV reactor safety analysis code.
CFD --- Sloshing --- Recriticality --- SPH --- Free Surface Flows
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"Notes on Computational Fluid Dynamics (CFD) was written for people who use CFD in their work, research or study, providing essential knowledge to perform CFD analysis with confidence. It offers a modern perspective on CFD with the finite volume method, as implemented in OpenFOAM and other popular general-purpose CFD software. Fluid dynamics, turbulence modelling and boundary conditions are presented alongside the numerical methods and algorithms in a series of short, digestible topics, or notes, that contain complete, concise and relevant information. The book benefits from the experience of the authors: Henry Weller, core developer of OpenFOAM since writing its first lines in 1989; and, Chris Greenshields, who has delivered over 650 days of CFD training with OpenFOAM. "
Computational grids (Computer systems) --- Modélisation CFD.
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The Smoothed Particle Hydrodynamics (SPH) method is proposed for studying hydrodynamic processes related to nuclear engineering problems. A problem of possible recriticality due to the sloshing motions of the molten reactor core is studied with SPH method. The accuracy of the numerical solution obtained in this study with the SPH method is significantly higher than that obtained with the SIMMER-III/IV reactor safety analysis code.
CFD --- Sloshing --- Recriticality --- SPH --- Free Surface Flows --- CFD --- Sloshing --- Recriticality --- SPH --- Free Surface Flows
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Karlsruhe Institute of Technology (KIT) is developing the parallel computational fluid dynamics code GASFLOW-MPI as a best-estimate tool for predicting transport, mixing, and combustion of hydrogen and other gases in nuclear reactor containments and other facility buildings. GASFLOW-MPI is a finite-volume code based on proven computational fluid dynamics methodology that solves the compressible Navier-Stokes equations for three-dimensional volumes in Cartesian or cylindrical coordinates.
containment --- CFD code --- hydrogen safety --- nuclear safety --- GASFLOW
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A multiscale simulation model is developed by combining the CFD Simulation and the population balance equations to describe a transient process of fluidized bed spray granulation. In this model, the CFD simulation generates the particle growth and nucleation rates in consideration of fluid dynamics, drying and multiple interactions, such as drops deposition, dust integration and nucleation between different particles (drops, dust and granules).
CFD-Simulation --- Keimbildungsrate --- Partikel-Populationsbilanzen --- Wirbelschicht-Sprühgranulation --- Multiscale-Simulation
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