Vortex Induced Vibrations (VIV) forms the basis of the hydrokinetic energy converter. With the increasing energy demand, there is a need for a significant shift to using clean and renewable sources of energy. VIV based hydrokinetic energy converter aims to harness aquatic energy from slow moving water currents. For modeling, a single cylinder system with single degree-of-freedom is considered. ...

Abstract The Valve-in-Valve (ViV) technique is an emerging alternative for the treatment of bioprosthetic structural valve deterioration (SVD) in mitral position. We report on intermediate-term outcomes patients with symptomatic SVD position who were treated by transcatheter valve-in-valve (TM-ViV) implantation during years 2010–2019 our center. Three main examined follow-up period: NYHA functi...

The effect of triple helical grooves on the suppression vortex-induced vibration (VIV) a circular cylinder was investigated experimentally in wind tunnel over Reynolds number range 1 × 104 < Re 4 104. It found that were effective suppressing VIV with peak amplitude reduction approximately 36%. In addition, lock-on region also reduced. To explore mechanism for VIV, experiments flow structures...

This study numerically investigates the vortex-induced vibration (VIV) of an elastically mounted rigid cylinder by using Reynolds-averaged Navier-Stokes (RANS) equations with computational fluid dynamic (CFD) tools. CFD analysis is performed for a fixed-cylinder case with Reynolds number (Re) = 104 and for a cylinder that is free to oscillate in the transverse direction and possesses a low mass...

Background: Valve-in-Valve (VIV) Transcatheter Aortic Valve Replacement (TAVR) is now the treatment of choice in high-surgical-risk patients with failing aortic bioprosthesis. Although less performed, VIV-Transcatheter Mitral Valve Replacement (TMVR) is a valid treatment option for selected high-risk patients with degenerated mitral bioprostheses. Several cases of elective ViVTAVR and -TMVR hav...

Vorticity induced vibrations (VIV) are caused by alternating vortices downstream of a structure, which result in a lift force acting on the structure perpendicular to the direction of the mean flow. This oscillating lift force excites vibrations of the flexible structure. When the vortex shedding frequency coincides with a natural frequency of the system, the structure vibrates at large transve...

The objective of the study was to compare OptiMAL test method with conventional microscopy for the detection of Malaria. 150 patients below the age of 15 years who were clinically suspected to be suffering from Malaria from July’14 Feb’15 were studied. OptiMAL test and Light microscopic examination of thick and thin blood films were done and the results compared. Out of 150 suspected cases of m...

The study numerically investigates the three-dimensionality in flow and two-degree-of-freedom (2DOF) vortex-induced-vibrations (VIV) characteristics of an elastically mounted circular cylinder. cylinder is allowed to vibrate both streamwise transverse directions. A low value mass-ratio [Formula: see text] with zero-damping coefficient taken for simulations. primary aim understand vortex sheddin...

Evaluating the aerodynamic instability of a bridge girder fitted with attachments such as handrails is critical for wind-resistance design long-span bridge. However, effects detailed configuration on performance have not been sufficiently studied. In this study, heaving vortex-induced vibration (VIV) box-girder was evaluated nongrid and grid-like handrail cases by free wind tunnel tests. The VI...

Valve-in-valve (ViV) transcatheter aortic valve implantation (TAVI) is an effective treatment for degenerated bioprosthetic valves in high-risk patients. Unfortunately, patient prosthesis mismatch (PPM) remains issue. PPM known to impact functional status, longevity, morbidity and mortality. Bioprosthetic fracturing (BVF) a method by which operators fracture the allowing greater expansion of ne...