Itlr uni stuttgart. Seminars

HLRS High Performance Computing Center Stuttgart

itlr uni stuttgart

Visiting researchers and an international summer school complement the courses. A large part of the course was dedicated to experimental applications, for example on how surface tension and contact angle measurements are carried out in practice. In a series of lectures distributed over four days, the 13 invited lecturers presented fundamentals, their own research and industrial applications in a wide range of topics. Experimental Investigation of Droplet Injections in the Vicinity of the Critical Point: A comparison of different model approaches. Die Nachwuchsgruppe soll diese Werkzeuge erarbeiten und die Grenzen und Kühlungsmöglichkeiten einer scharfen Anlaufkante untersuchen. Not only phenomenological comparison of this process with experiments, but also information about temporal evolution of the wave energy, structures in the water layer or dynamics of vortices are remarkable results of these simulations. The resulting dependency of the evaporation rate on the relative humidity is depicted in Fig.

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Droplet dynamics

itlr uni stuttgart

In an open wind tunnel, the impact rays can additionally be superimposed with a cross flow. This study deals with the numerical and experimental investigation of complex impact beam arrangements. Munz Stuttgart Invited Guests: F. This large difference in the scales requires a fine resolution of the computational grid. This is of particular interest for the transition from a classical two phase evaporation to a diffusive mixing. The Summer School provided an opportunity for each group to work intensively for some weeks in September.

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Seminars

itlr uni stuttgart

The simulated real time is in the order of 10 ms. In conjunction with this observations reflections and refractions on the material interface are used as in indicator for the existence of the material interface of the injected droplet. Evaporation of supercooled water droplets Not only freezing processes but also the evaporation of supercooled water droplets need to be understood for the improvement of meteorological models. Verantwortlich an der Universität Stuttgart ist Prof. Solche Hochtemperaturstrukturen sind in der Raumfahrt, wo Teile des Fluggeräts Temperaturen von über 2.

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Institute of Aerospace Thermodynamics (ITLR), University of Stuttgart, Germany

itlr uni stuttgart

Wave steepnesses and the different wave lengths of all parasitic capillary waves offer detailed insights into energy dissipation mechanisms, which could not be gained from experiments. The approximately 2000 students of aerospace engineering and geodesy also learn about the interdisciplinary research areas of aviation technology, aircraft development, propulsion systems, avionics, spacecraft ascent and re-entry, satellite technology, and earth observation. Complex phenomena demanding strong computational effort can be simulated because the code works on massive parallel architectures. Fabrication and Evaluation Methods of Micro-structured Surfaces for Droplet Impact Experiments. Doch werden die Hitzeschilde derzeit noch mit sehr hohen Sicherheitsfaktoren ausgelegt, weil die Wissenschaftler das Thermalverhalten vor allem im Wechselspiel mit der Anströmung noch nicht ausreichend gut verstehen. A cyclone tube consists of a tube with one or more tangential inlets, which impose a strong twist on the flow.

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University

itlr uni stuttgart

If the conditions are such that secondary droplets are ejected, this phenomenon is called splashing. To better predict the resulting temperature of the blades, an improvement of the existing numerical models to describe the turbulent flow is required. The main focus is on the interaction of the incoming drops with the drops already deposited on the surface. This project aims to optimize cooling processes in turbine components by applying new turbulence and scalar flux models. To increase the internal heat transfer of gas turbine blades, a combination of different cooling mechanisms such as impingement jets, pin fins and ribs is used, resulting in very complex flows. To predict the spray formation by numerical simulations, small scale processes like the collision outcome of two droplets must be known.

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Institute of Aerospace Thermodynamics

itlr uni stuttgart

Note, that diffuse mixing processes of a fluid in a solvent do not require a material interface as a evaporation does. Also the collisions of two droplets of two different immiscible fluids are of interest for this research which is part of the sub-project A7 in the Collaborative Research Center. The doctoral researchers presented their work progress and received feedbacks from colleagues, associated members, principal investigators and advisory board members. One reason for this is that not only the properties of the liquids themselves but also their ratio matters. These methods are of analytical, numerical and mostly experimental nature. Freezing Supercooled water droplets exist in liquid form at temperatures below the freezing point.

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Heat Transfer

itlr uni stuttgart

Particularly, the influence of boundary conditions on the amount and the location of condensate formation is considered. Furthermore, the investigation of different contact angle models for the three-phase contact line is planned in order to reproduce different wetting behavior. Equal opportunity, equal rights, and diversity characterize our working together. Here, a better understanding of two-component splashing dynamics can be a great advantage in order to minimize both engine emissions and lubrication losses. The aim is to reduce internal cooling air consumption in order to increase efficiency while simultaneously reduce emissions. This interaction occurs during the regeneration of the particle filter and leads to both a dilution of the engine oil wall film and to higher pollutant emissions.

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Heat Transfer

itlr uni stuttgart

These include thermodynamics, hydrodynamic instabilities of liquid jets leading to primary atomization, breakup of droplets, and finally the realization of atomization and sprays as engineering solutions. The topic of this lecture was the description of methods to study basic droplet dynamic processes. Tonini University of Bergamo , Dr. The current investigation focusses on the understanding and modelling of the underlying processes. Besides the investigation in unary systems the droplet injection in environments close to or above the critical point of the injected fluids is being investigated.

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