The under-balanced drilling technology is based on how to control the bottom negative pressure which is related to the pressure computation of multiphase flow in annulus .
井底负压值控制是欠平衡钻井技术的基础，而井底负压值的大小与环空多相流的有关压力计算有关。
The development of perimeter control of the checkerboard involved in structure topology optimization of multiphase materials is presented.
针对多相材料结构的拓扑优化出现的棋盘格问题，研究了周长约束控制方法。
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