Based on the test results and movement equation established, the relationship between drag coefficient and tubular shape is obtained and the drag force imposed on pipe is calculated.

根据试验结果和建立的运动方程，获得阻力系数与圆管形状的关系，并计算了圆管所受到的拖曳力。

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Drag of the train head is obtained by the method of surface integral and drag coefficient can be computed at the same time.

通过表面积分的方法得到各种列车车头的阻力，进而计算得到了车头模型的阻力系数。

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Surely the most underappreciated number in the Ram spec sheet is its 0.36 coefficient of drag, given that the 2013 Ram's grille is larger, higher and more bluff than before, recalling the big-rig aesthetics of the mid-1990s.

WSJ: 2013 Ram Laramie Longhorn Review: A Truck That Jingle Jangle Jingles