Titlebook: Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles; Gino Sovran,Thomas Morel,William T. Mason Book 1978 Springer Science+Busine

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The Drag Related Flow Field Characteristics of Trucks and Buses modifying body contours or by employing add-on devices, apparent minimum drag limits have been identified. The possibility of even lower drag levels within existing constraints is analyzed. At the end, non-zero yaw drag characteristics are briefly discussed.

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Some Effects of Free-Stream Turbulence and the Presence of the Ground on the Flow Around Bluff Bodiesed vehicle shape in “ground effect” and they demonstrate the importance of ground clearance. The results also expose differences between wind-tunnel measurements made with a moving wall and a fixed ground plane. Finally a two-dimensional, free-streamline theory is used to predict, qualitatively, the experimental results.

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