...面区,流动情况变化很大,特别是在粘性底 层,流动几乎是层流,湍流应力几乎不起作用,这时可采用 壁面函数法 ( wall functions ),一组半经验公式,它是将壁面上的物理量与湍流核心区内待求的未 知量直接联系起来,但必须与高Re数k一£模型配合使用。
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The method of Wall functions was used near wall.
近壁面采用壁面函数法来处理。
Taking the first three teams of the expression of Theis exact solution as the approximation of the two wall functions describing the drawdown, the binary linear regression expression is developed.
将降深表达式中的两个井函数利用其展开式的前三项作为其近似式,建立一个二元线性回归方程。
It has the functions of spinning and cutting, especial ly available to cut off big thin-wall cylindrical workpiece such as the shell of compressor.
该机床具有旋压切断功能,特别适用于压缩机壳体等大型圆柱薄壁筒形件的切断加工。
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