拖曳系数随物体的形状而异。
对土壤热通量的参数化方法和拖曳系数的取值问题进行了讨论，更完善的方法还有待于与实验测量工作相结合。
The parameterization for the soil heat flux and the surface drag coefficient are discussed, and the more perfect method needs to combine further with measure experiments.
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。
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.
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