FG Numerische Fluiddynamik

5 Items

Recent Submissions
The dynamics of volcanic jets

Cigala, V. ; Kueppers, U. ; Peña Fernández, J. J. ; Taddeucci, J. ; Sesterhenn, J. ; Dingwell, D. B. (2017-07-24)

Pyroclast ejection during explosive volcanic eruptions occurs under highly dynamic conditions involving great variations in flux, particle sizes, and velocities. This variability must be a direct consequence of complex interactions between physical and chemical parameters inside the volcanic plumbing system. The boundary conditions of such phenomena cannot be fully characterized via field obser...

Contact electrification in aerosolized monodispersed silica microspheres quantified using laser based velocimetry

Alois, Stefano ; Iversen, Jens Jacob ; Merrison, Jonathan ; Sesterhenn, Jörn (2017-04)

The contact electrification of aerosolized micro particles has been studied using a novel technique involving laser velocimetry. This has allowed the simultaneous determination of size and electrical charge of individual silica microspheres (in the range 1 – 8 µm). Interestingly the particles interacting with the injector tube have been seen to become electrified with a relatively narrow range ...

The compressible starting jet

Peña Fernández, Juan José (2018)

Jets are involved in numerous industrial applications and in nature: fuel injection, jet engines, volcanic jets, air-bag devices, but also water jet cutters, jet packs (rocket belts), jet injectors for vaccination, astrophysical jets, etc. Continuous jets have been already studied in the incompressible and compressible case for almost a century, focused mainly on the characterization of the flu...

Simulation und Analyse einer Verdichterkaskade mit aktiver Strömungsbeeinflussung

Gmelin, Christoph (2018)

Axiale Verdichter erreichen heutzutage sehr hohe Gesamtdruckverhältnisse, wozu eine hohe Anzahl von Verdichterstufen notwendig ist. Bei Flugtriebwerken stellt das Einsparen ganzer Stufen eine Möglichkeit dar, gleichzeitig das Gewicht und den Bauraum zu reduzieren. Für stationäre Gasturbinen wird der Teillastbetrieb mit steigendem Anteil an regenerativen Energien immer bedeutsamer. Beide Forderu...

Numerical simulation of a regional train in cross-wind

Eichinger, Sándor ; Sima, Mikael ; Thiele, Frank (2015)

In this work numerical investigations of regional trains were carried out studying the prediction accuracy of the aerodynamic load in cross-wind assessment of rail vehicles. The main focus is on 30° yaw angle. Two domain setups, one representing the wind tunnel setup and another more generic one, were investigated and validated against available measurements comparing load coefficients. Importa...