TITLE:
Dynamic Simulation and Hemolysis Evaluation of the Regurgitant Flow over a Tilting-Disc Mechanical Heart Valve in Pulsatile Flow
AUTHORS:
Uzu-Kuei Hsu, Pong-Jeu Lu
KEYWORDS:
Heart Valve; CFD; Blood Cell Damage Index; Stress; Lagrangian Particle Tracking
JOURNAL NAME:
World Journal of Mechanics,
Vol.3 No.3,
June
4,
2013
ABSTRACT:
Regurgitation in the heart diastolic phase represents a critical
flow condition associated with many heart valve design considerations. The
finite volume method, the Low-Reynolds-Number k-ω turbulent model and sliding mesh model are employed to solve
and compare the complex flow field and the torque in each case. The end results
expected from a cardiovascular CFD analysis are not limited only to the
flowfield investigations. More importantly, it needs an evaluation
criterion to judge if the design is acceptable as considered from a broader
blood cell damage or activation perspective. In this
study, blood cell damage index developed based on stress-time empirical rule
and Lagrangian particle tracking is introduced to assess the viscous and
turbulence-induced stresses effect to the blood cells.