Unsteady and Three-Dimensional Simulation of Blood Flow in the Human Aortic Arch

摘要: A three-dimensional and pulsatile blood flow in a human aortic arch its three major branches has been studied numerically for peak Reynolds number of 2500 frequency (or Womersley) parameter 10. The simulation geometry was derived from the reconstruction series two-dimensional slices obtained vivo using CAT scan imaging on aorta. numerical simulations were projection method, finite-volume formulation Navier-Stokes equations used system overset grids. Our results demonstrate that primary velocity is skewed towards inner wall ascending aorta, but this skewness shifts to outer descending thoracic Within branches, velocities distal walls with reversal along proximal walls. Extensive secondary motion observed structure these flows influenced considerably by presence branches. shear stresses highly dynamic, generally high vicinity low wall, particularly higher than Wall pressure around Comparison our localization early atherosclerotic lesions broadly suggests preferential development regions extrema (either maxima or minima) stress pressure.