虽然油气的浮力流和渗流都是地下多孔介质中的流动，但油气在水中上浮不呈连续相流动。
Hydrocarbon migrates in the buoyancy-driven flow or the seepage flow through the subsurface porous media, but it moves upward in discontinuous phase in the course of buoyant ascent.
当输出滤波电感的电流在一个周期内不连续时，移相全桥PWM变换器就工作在电流断续模式（DCM）。
Phase-shifted full-bridge PWM converters work in discontinuous current mode (DCM), when the current of out-put filter inductor is discontinuous in one switching period.
对于相不连续性问题，则通过建立标识矩阵来解决。
An indicator matrix is constructed to represent the phase discontinuity.
应用推荐