光滑流是满足某些条件的映射。微分流形M上任一有紧支集的光滑向量场在M上产生一个光滑流。
③相等平均隙宽条件下的粗糙裂隙比光滑裂隙的过流能力小得多。
The fluid passing ability for coarse fractures is smaller than the smooth fractures on the same conditions.
产品外观光滑，无粒点，无流痕。
Product appearance of smooth, non-grain points, no flow marks.
试验研究发现明流光滑平板边界层中，与无限边界绕流平板边界层一样，沿平板有层流边界层，转捩区和紊流边界层三部分。
Like in an infinite flow, we find that laminar boundary layer, transition region and turbulent boundary layer also exist along a flat plate in open channel flow boundary layers.
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