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• W964041167 abstract "In this thesis several simulations have been carried out aimed at improving the knowledgeof vehicle aerodynamics and improving the flow around vehicles with respect to theaerodynamic drag. Four flows around different simplified vehicles have been considered.One model of a tractor-trailer, one passenger car model, one freight wagon model andone regional train model. The simplified tractor-trailer model consists of a front boxrepresenting a tractor and a rear box representing the trailer. The two boxes are separatedby a gap width which is varied in the simulations. In the simulations on this geometry,the focus is on the flow in the gap between the tractor and the trailer and how this flowaffects the global drag on the model. Large Eddy Simulation is used to simulate theflow around four variants of the model with different geometrical configurations. Thebehavior of the drag coefficient of the tractor-trailer model when varying the gap widthand the shape of the front edges on the tractor is explained by identifying and analysingthe large vortices around and in the the gap. The focus in the study on the passengervehicle model is on the so-called A-pillar vortex. This is a swirling longitudinal vortexformed along the side windows on passenger vehicles due to the separation of the flowfrom the side edges of the front window and the engine hood. Flow control, both blowingand suction, from actuators located on the side of the front of the model is applied inthe LES simulations. Steady blowing into the vortex causes expedited breakdown of thevortex, which in turn influence the pressure distribution on the side windows and theoverall drag of the model. Steady suction causes the vortex to not form at all, therebyremoving the vortex entirely. Simulations aimed at improving the knowledge on the flowaround a generic freight wagon model using LES is also reported. The model is smoothedin comparison to a real container wagon, but the overall geometrical features such aswheels and underhood are included. The simulations of the flow around the regionaltrain model is done using Partially Averaged Navier Stokes (PANS). PANS is a recentlyproposed hybrid turbulence model for engineering types of flow. The regional train modelconsists of a bluff body with a length to height/width ration of 7:1. The model posesseveral challenging flow situations to simulate such as separation from the leading curvedfront edges, an attached boundary layer flow and separation from the curved rear edgesat the moderate Reynolds number of 400 000 based on the models’ width. An open cavityis placed on the model at the base and the drag is thereby decreased by some 10%" @default.
• W964041167 created "2016-06-24" @default.
• W964041167 creator A5009464021 @default.
• W964041167 date "2012-01-01" @default.
• W964041167 modified "2023-09-26" @default.
• W964041167 title "Unsteady Numerical Simulations of Flow around Heavy Vehicles, Trains and Passenger Cars" @default.
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