时变流 meaning in English

time-dependent flow

To use the dynamic mesh model , it is necessary to provide a starting volume mesh and the description of the motion of any moving zones in the model . this paper describes the motion using a c program , a user - defined function ( udf ) , to calculate the linear and angular velocities from the force balance on the store
与此相映，动态网格计算技术是最近两年计算流体动力学最新发展成熟的重大成果，并且在先进的cfd计算软件中得到了实际的应用，开始为计算飞机投弹之类复杂相对运动造成的时变流场等领域提供了实际可行的工程方法。