我觉得是设定迭代计算的初始条件（即Y方向速度失量从500mm/s开始计算而不是从0m/s开始计算），只是为了节省计算时间更快收敛，并不是指在500mm/s的环境。
文献资料:
Because the problems of interest from the notebook system level perspective are steady state problems,
specification of initial conditions for flow and temperature are not required.
Most CFD software is capable of assuming a set of initial conditions from which they iterate until a steady state solution is reached.
