The models are obtained by simulating and simplifying the big curve at the arch of aorta and opposite curve of branching vessels . the original conditions of simulation calculating are the entrance velocities and the exit pressures . the boundary conditions are the wall non - slippery flow conditions and the symmetry conditions 它是基于主動(dòng)脈弓處的大彎曲和分叉血管的反彎曲進(jìn)行模擬簡(jiǎn)化,模擬計(jì)算的初始條件是進(jìn)口速度和出口壓力,邊界條件是壁面無(wú)滑流條件和對(duì)稱性條件。