封闭边界 meaning in English

closed boundary

The volume integrals can be transformed to surface integrals using gauss ' s theorem . two cases are studied , one is floating upright and another is free floating in 3d space
运用gauss定理，关于空间封闭区域的三重积分可以转化为沿封闭边界曲摘要面的二重积分。
In the literature , the flow equations for partial penetrating wells are based on two - dimensional model with impermeable upper and lower boundaries , and they cannot reflect the characteristics of bottom water drive mechanism , while the new equations presented in this paper can accurately describe the deliverability of partial penetrating gas wells with non - darcy flow pattern in gas reservoirs with bottom water
目前仍使用改进的上下封闭边界的裘比公式，未能充分地反映底水驱动特点，而该公式能准确地描述底水驱动的打开不完善井非达西流动规律下的产能。