NUMERICAL FLOW ANALYSIS OF PULSATILE FLOW IN A CHANNEL WITH SYMMETRIC WAVY WALLS AT MODERATE REYNOLDS NUMBERS

[摘要] References(6)Cited-By(16)A numerical analysis of pulsatile flow in a wavy channel with periodically converging-diverging cross sections was carried out by the finite element method. The variations of streamline and wall shear stress with Womersley number A*, Reynolds number Re and oscillatory fraction of the flow rate P were studied. A recirculation vortex occurs within the furrow of the wall during the acceleration phase for inertia-dominated flow but during the deceleration phase for viscosity-dominated flow. Its boundary is determined in terms of A*2/Re. As Re or P increases, higher modes appear in the time variation of wall shear stress owing to the non-linear effects, and also a kind of Reynolds stress occurs in the time-averaged wall shear stress. An experimental flow visualization study additionally performed shows good agreement with the numerical analysis.

[关键词] Fluid Mechanics;Pulsatile Flow;Wavy Channel;Unsteady Separation;Finite Element Method;Flow Visualization