KINEMATIC AND DYNAMIC CHARACTERISTICS OF PULSATILE FLOWS IN STENOTIC VESSELS

Nonlinear pulsatile blood hows in distensible vessels were calculated using an implicit finite-difference scheme. The time-dependent wavy lu men was mapped to a fixed rectangular domain. The transient geometric, kinematic, and dynamic boundary conditions were grouped as dimensionl ess parameters in the Navier-Stokes equations. The flow was controlled by a time-dependent von Karman number and the dilatation and contract ion of the wall. Local acceleration components along the wall, the inl et, and the outlet were employed in the determination of the Neumann b oundary condition for the pressure field. The momentum flux associated with wall motion had a significant effect on the flow rate and the re sistance coefficient. The interaction of the main flow and flow separa tion was dominated by flow acceleration and deceleration.