零流面的选取是东海黑潮地转流计算中的一个基本问题。
The selection of level of no motion is a basic problem in calculating the geostrophic flow in the East China Sea Kuroshio area.
另一种常用的方法称为有限元法，这种方法可以很自然地处理零流边界条件。
Another commonly used technique, finite element method, is able to handle no-flux boundary condition naturally.
利用该测速系统，进行了超声波的重复性测试，以及在以空气为介质的零流实验。
The repetition of the ultrasonic sound and the experiment of zero velocity in gas flowmeter are tested using this speed measurement system.
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