抄録
This paper describes the improvement of accuracy for prediction of index of hemolysis in shear blood flow by computational fluid dynamics(CFD) with modiaed turbulence model, applying to orifice-pipe blood now, which is simple model of turbulent shear stress induced hemolysis in the high speed rotary blood pump. Using CFD with partially patched modified κ-ε model (Launder-Kato partially patched model;LK-Zonal), results of the now field in the orifice-pipe flow are compared with standard low Reynolds number κ-ε model at whole region (STD), and it is found that the shear stress by LK-Zonal model is predicted more precisely than that by STD model near the impinging flow region. As for hemolysis, from the computational data of orifice-pipe now, the index of hemolysis is estimated in the same way as our previous paper(1), and it is found that the accuracy for prediction of index of hemolysis is also improved using LK-Zonal model in comparison with STD model, particularly in case of the orificel pipe now with large and long contracted part. From these results, the design method using CFD for the rotary blood pumps, that have impinging flow region to the wall, for suppressing the hemolysis can be proposed.
