1,721,404 research outputs found
Direction change of fluid particles in confined two-dimensional turbulence
No full textThe directional change of a fluid particle can be measured by the angle between two subsequent particle displacement increments. At small values of the time-increment the so-defined angle is proportional to the curvature of the trajectory. At large values this coarse-grained curvature should be affected by the presence of solid no-slip walls around the flow domain. We compare homogeneous and confined two-dimensional turbulent flows and show that the PDF of the angle is indeed strongly modified by the presence of walls
Schullaufbahnempfehlungen von Lehrkräften und Schullaufbahnentscheidungen von Eltern am Ende der vierten Jahrgangsstufe
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Temperature fluctuations induced by frictional heating in isotropic turbulence
No full textThe temperature fluctuations generated by viscous dissipation in an isotropic turbulent flow are studied using direct numerical simulation. It is shown that the scaling of their variance with Reynolds number is at odds with predictions from recent investigations. The origin of the discrepancy is traced back to the anomalous scaling of the dissipation rate fluctuations. Phenomenological arguments are presented which explain the observed results
Lesekompetenzen von Viertklässlerinnen und Viertklässlern in der Deutschsprachigen Gemeinschaft im internationalen Vergleich
No full textAnlage und Durchführung der Internationalen Grundschul-Lese-Untersuchung in der Deutschsprachigen Gemeinschaft (IGLU Belgien)
No full textDie Koppelung von sozialer Herkunft und Lesekomptenz im internationalen Vergleich und in der Deutschsprachigen Gemeinschaf
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