The Ahmed model is often used to model bluff car bodies. The

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The Ahmed model is often used to model bluff car bodies. The schematic for one model is shown here, along with two cars

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The Ahmed model is often used to model bluff car bodies. The schematic for one model is shown here, along with two cars traveling in line, together with the mesh geometry. Analyse this problem by answering the following questions: (a) Explain why there is a fine mesh surrounding the near regions of each car body. (b) Indicate the regions of high and low pressure encountered around the car bodies. (c) What is the general effect that the lead car model has on the drag coefficient of the trailing model? (d) What happens to the drag and lift coefficients if the two models are in close proximity (i.e., x/L0.25, where x is the distance and L is the length of the models)? (e) When using two different k-e turbulent models, one model overpredicts while the other under-predicts the turbulent kinetic energy k. Explain the difference of the flow behaviour against the experimental value XE shown in the figure.

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