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Das Strailer-Konzept ist ein neuartiges Transportsystem, das zur Personenbeförderung neben dem Einsatz im Straßenverkehr Langstrecken an einem Hochschienensystem be-wältigt. Aufgrund der Art der Lagerung an der Hochschiene ist das System anfällig gegen-über Windlasten von seitlicher Anströmrichtung. Diese Arbeit untersucht die windinduzierten Belastungen an der Strailer-Fahrzeugkabine im Schienenbetrieb mittels numerischer Strömungssimulation. Den Ausgangspunkt für die Berechnung bildet ein virtueller Windkanal, indem unter der Verwendung des Realizable - k-e Turbulenzmodells die...
Flügel werden im Bootsbau seit Jahrzehnten bei Geschwindigkeitsrekordversuchen genutzt, in denen Praktikabilität und Anpassungsfähigkeit an extreme Wetterbedingungen eine untergeordnete Rolle spielen. Ein Meilenstein für diese Entwicklung ist mit dem Erscheinen des Buches „The 40-knot Sailboat“ 1963 von Bernard Smith gegeben (1). Der America’s Cup 1988 wurde in Folge eines Streits zwischen dem Verteidiger, dem amerikanischen Team von Dennis Connor und dem Herausforderer, dem neuseeländischen Team um Sir Michael Fay, als Deed of Gift Race ausgetragen. Somit mussten ausschließlich die...
Die Biogaserzeugung stellt eine Technologie zur Bereitstellung eines CO2-neutralen Energieträgers dar und gewinnt zunehmend an wirtschaftlicher Bedeutung. Da es sich um eine relativ junge Technik handelt, befindet sie sich derzeit in einem stark progressiven Stadium. In vielen technischen Bereichen, wie z.B. der Biologie und der Prozesstechnik ist deshalb hinsichtlich der Raum-Zeit-Ausbeute noch viel Verbesserungspotential vorhanden. Das zentrale Organ der Biogaserzeugung stellt der Fermenter dar, in dem in einer anaeroben Reaktion Biogas erzeugt wird. Auf die Effizienz der biologischen...
A list of university teams that CD-adapco sponsors in the racing world. These teams are made up mostly of students with a small number of professorial guidance to design and build a race car.
When Dave Brailsford announced the formation of Team Sky in 2010, he did so with the explicit ambition of propelling a British rider to the top step of the Tour de France podium by 2015. To cycling experts, it seemed like a brave and almost foolhardy prediction. In the 97 editions of the Tour de France that preceded Brailsford's announcement, no British rider had finished in the top 3 of the world's most important cycle race, let alone threatened to win it. Therefore, it seemed unlikely that Brailsford - a newcomer to the world of professional cycling would be able to reverse that lack of fortune in such a short period of time. The experts were wrong and spectacularly so. This Sunday as the Tour wrapped up its 100 year anniversary (two years ahead of Brailsford schedule) Team Sky rider, Christopher Froome rode into Paris wearing the coveted yellow jersey on his shoulders with a comfortable 5 minute margin over the second place rider. In doing so, he claimed not the first, but the second consecutive victory for a British Team Sky rider at the Tour de France, following in the footsteps of last year's winner Sir Bradley Wiggins. So how did Team Sky manage to beat their own prediction and deliver a double British victory two years ahead of their plan?
In the last years the limitation of resources and rising environmental pollution at the same time caused a rethinking in society. Careful handling of raw materials gets more and more important. These circumstances in combination with more severe legislative boundary conditions have big influences on the automotive industry. The acceptance of vehicles with high fuel consumption decreases from year to year. “Green” vehicles driven by alternative propulsion concepts reach increased market penetrations. Among other measures, the potential of aerodynamics has to be tapped to reduce the fuel...
With the experimental data from a road test with a full-size tractor-trailer configuration, I am to recreate the experiment within STAR-CCM+ and compare the solution to the given data. For realistic conditions the simulation will include the rotation of the tires, the relative translation of the road and a detailed volume mesh, which all will be implemented directly via STAR_CCM+.
How Do You Consider Surface Tension Effects Between Particles When Using DEM? In STAR-CCM+, we can model the effect of the presence of the liquid film on the surface of DEM particles in the approximation of liquid bridge model. The capillary force resulting from the surface tension and the pressure difference inside the liquid bridge has known dependence on the wetting angle, liquid surface tension, particle size, etc. If one assumes particular shape of liquid bridge, the solution of Laplace-Young equation provides the solution for hydrostatic pressure within liquid bridge. This gives the analytical solution for the maximum force needed to separate two particles connected with liquid bridge (lots of literature is available on this, including using liquid bridge model with DEM). Now, you just need to equate the liquid bridge force with STAR-CCM+ expression for linear cohesion force and voilà! - obtain the value of STAR-CCM+ cohesion parameter. Using cohesion model this way should account for the surface tension effect on the bulk flow of wet grains.

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