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RISDirection and Magnitude of Blood Flow Shear Stresses on the Leaflets of Aortic Valves: Is There a Link With Valve Calcification?
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Aortic stenosis caused by valve calcification is a major cause of death around the world. Hemodynamic factors have been suggested to be major players in the development of valve calcification, ...
3D Unsteady RANS Modeling of Complex Hydraulic Engineering Flows. I: Numerical Model
Publisher: American Society of Civil Engineers
Abstract: A general-purpose numerical method is developed for solving the full three-dimensional (3D), incompressible, unsteady Reynolds-averaged Navier-Stokes (URANS) equations in natural river reaches containing complex hydraulic ...
Spectral Sampling Method for Uncertainty Propagation in Long-Wave Runup Modeling
Publisher: American Society of Civil Engineers
Abstract: This paper presents a stochastic approach to model input uncertainty with a general statistical distribution and its propagation through the nonlinear long-wave equations. A Godunov-type scheme mimics breaking waves as ...
Modeling of Laminar-Turbulent Transition in Boundary Layers and Rough Turbine Blades
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A local, intermittency-function-based transition model was developed for the prediction of laminar-turbulent transitional flows with freestream turbulence intensity Tu at low (Tu < 1%), moderate (1% < Tu < 3%), ...
Flow in a Mechanical Bileaflet Heart Valve at Laminar and Near-Peak Systole Flow Rates: CFD Simulations and Experiments
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Time-accurate, fully 3D numerical simulations and particle image velocity laboratory experiments are carried out for flow through a fully open bileaflet mechanical heart valve under steady ...
Stochastic Solution for Uncertainty Propagation in Nonlinear Shallow-Water Equations
Publisher: American Society of Civil Engineers
Abstract: This paper presents a stochastic approach to describe input uncertainties and their propagation through the nonlinear shallow-water equations. The formulation builds on a finite-volume model with a Godunov-type scheme for ...
3D Unsteady RANS Modeling of Complex Hydraulic Engineering Flows. II: Model Validation and Flow Physics
Publisher: American Society of Civil Engineers
Abstract: A chimera overset grid flow solver is developed for solving the unsteady Reynolds-averaged Navier-Stokes (RANS) equations in arbitrarily complex, multiconnected domains. The details of the numerical method were presented ...
Numerical Simulation of Flow in Mechanical Heart Valves: Grid Resolution and the Assumption of Flow Symmetry
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A numerical method is developed for simulating unsteady, 3-D, laminar flow through a bileaflet mechanical heart valve with the leaflets fixed. The method employs a dual-time-stepping artificial- ...
Global Sensitivity Analysis for U(VI) Transport for Integrating Coupled Thermal–Hydrological–Chemical Processes Models Into Performance Assessment Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The long-term integrity of the bentonite buffer is of significant interest in the performance assessment (PA) of geological nuclear waste disposal. This study aims at understanding how the initial bentonite chemical ...
Simulation of Mechanical Environment in Active Lead Fixation: Effect of Fixation Helix Size
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The risk of myocardial penetration due to active-fixation screw-in type pacing leads has been reported to increase as the helix electrodes become smaller. In order to understand the contributing ...