为了了解由阀门注入的快速气体通过管道进入系统时的流动状态，必须求解在固定流量边界条件下的一维非线性扩散方程。
Flowing state of the gas during gas flows into the system was given by means of the calculation. The character of B-A nude gauge in flowing gases and the piezoelectric valve was measured.
该流动受一非线性纳维·斯托克斯方程控制，因此要获得该流动的精确解是一个十分困难的流体力学问题。
The flow is governed by Navier-Stokes equations. Therefore it is extremely difficult to obtain an accurate solution.
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