Searched for: mods_originInfo_publisher_s%3A%22Zakon%255C%2BGroup%22
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Francesco, Picano (author), Breugem, W.P. (author), Luca, Brandt (author)
Suspensions are often found in different processes and applications, e.g. sediment transport in environments or pharmaceutical engineering. The laminar regime in the semi-dilute or dense cases, non vanishing volume fraction, is usually characterized by the sometime spectacular rheological properties induced by the suspended phase. Much less...
conference paper 2013
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Vuorinen, V.A. (author), Duwig, C. (author), Kaario, O. (author), Larmi, M. (author), Boersma, B.J. (author)
Large-Eddy Simulations (LES) based on scale-selective implicit filtering are carried out in order to study the effect of nozzle pressure ratios on the characteristics of highly underexpanded jets. Pressure ratios ranging from 3 to 9 with Reynolds numbers of the order 70000 to 150000 are considered. The studied configuration agrees well with...
conference paper 2013
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Eckhardt, B.E. (author), Kreilos, Tobias (author)
Parallel shear flows, like plane Couette flow or the asymptotic suction boundary layer, come with continuous symmetries of translation in the downstream and spanwise direction. Flow states that differ in their spanwise or downstream location but are otherwise identical are dynamically equivalent. In the case of travelling waves, this trivial...
conference paper 2013
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Brauckmann, Hannes J. (author), Eckhardt, B.E. (author)
In Taylor-Couette flow with sufficiently strong counter-rotating cylinders, the turbulence near the outer cylinder shows intermittent oscillations in form of turbulent bursts. We present this phenomenon in direct numerical simulations for radius ratios η = 0.5 and 0.71 and identify a critical value in the rotation ratio µ for its onset. We...
conference paper 2013
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Eisma, H.E. (author), Elsinga, G.E. (author), Westerweel, J. (author)
Interfaces are commonly observed features of turbulent flows. Previous research has indicated the significance of these interfaces on the overall dynamics of the turbulent flow [1]. The current research focuses on both the external Turbulent/Non-Turbulent (T/NT) interface as well as internal layers that are present in an experimentally...
conference paper 2013
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Kreilos, Tobias (author), Eckhardt, B.E. (author), Schneider, Tobias M. (author)
We track the onset of chaos in plane Couette flow. The formation of a chaotic saddle through a boundary crisis is discussed. We show that inside the chaotic saddle, new saddle-node bifurcations create stable pockets of turbulence, which subsequently undergo boundary crisis. This leads to a non-monotonic variation of characteristic lifetimes...
conference paper 2013
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Boersma, B.J. (author)
With todays supercomputers we are able to simulate flows with moderate to high Reynolds numbers. These flows show features that are not present in simulations with lower Reynolds numbers. Recently we have finished a fully resolved direct numerical simulation of a turbulent pipe flow with a bulk Reynolds number of 76,000 on a computational...
conference paper 2013
Searched for: mods_originInfo_publisher_s%3A%22Zakon%255C%2BGroup%22
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