A passive jet flow control method was employed to suppress the unsteady vortex shedding from a circular cylinder at the Reynolds number level of Re= (0.18~1.1)×10. The passive jet flow control was achieved by blowing jets from the holes near the rear stagnation point of the cylinder, which are connected to the in-take holes located near the front stagnation point through channels embedded insid...

Saphenous veins used in aortocoronary bypass procedures slowly narrow. The narrowing and atherosclerosis appear to develop in reaction to the new flow conditions present in the saphenous veins. Localization of atherosclerosis in the arterial system also suggests that local flow conditions play a role in atherogenesis; plaques are characteristically found in regions of separated flow. The patter...

Saphenous veins used in aortocoronary bypass procedures slowly narrow. The narrowing and atherosclerosis appear to develop in reaction to the new flow conditions present in the saphenous veins. Localization of atherosclerosis in the arterial system also suggests that local flow conditions play a role in atherogenesis; plaques are characterically found in regions of separated flow. The pattern o...

The classical Hiemenz solution describes incompressible two-dimensional stagnation point flow at a solid wall. We consider an unsteady version of this problem, examining particularly the response close to the wall when the solution at infinity is modulated in time by a periodic factor of specified amplitude and frequency. While this problem has already been tackled in the literature for general...

A numerical study employing discontinuous Galerkin method demonstrating net surface heat reduction for a cylindrical body in Mach 17 hypersonic flow is presented. This application focuses on using sinusoidal dielectric barrier discharge plasma actuators to inject momentum near the stagnation point. A 5 species finite rate air chemistry model completes the picture by analyzing the effect of the ...

Stent placement keep artery open but it perturbs more often blood flow. Stent shape in artery can provoke the presence of recirculation zones, blood stagnation zones, thrombosis and embolism. the aim of this work is to find optimal stents shapes in order to reduce blood stagnation and recirculation zones. As it has already been observed [2], [8] a stent associated with a higher value of shear s...

Interior stagnation point flows of viscoelastic liquids arise in a wide variety of applications including extensional viscometry, polymer processing and microfluidics. Experimentally, these flows have long been known to exhibit instabilities, but the mechanisms underlying them have not previously been elucidated. We computationally demonstrate the existence of a supercritical oscillatory instab...

We propose a new model for the formation of fast, lowionization emission regions (FLIERs) in planetary nebulae that is able to account for many of their attendant characteristics and circumvent the problems on the collimation/formation mechanisms found in previous studies. In this model, FLIERs are formed in the stagnation zone of partially collimated stellar winds with reduced momentum flow al...

Bivalirudin has been proposed as the sole anticoagulant in patients under extracorporeal membrane oxygenation (ECMO) or cardiopulmonary bypass. Owing to the pharmacodynamic properties of bivalirudin, areas of blood stagnation should be carefully avoided in order to limit the risk of thrombosis. The ECMO circuit has no reservoir and is usually devoid of blood stagnation areas. Conversely, under ...

Unsteady two-dimensional stagnation point flow of an incompressible viscous fluid over a flat deformable sheet is studied when the flow is started impulsively from rest and the sheet is suddenly stretched in its own plane with a velocity proportional to the distance from the stagnation point. After a similarity transformation, the unsteady boundary layer equation is solved numerically using the...