... was applied using a controlled pump. Inner pressure waves and flow velocity were then measured using a pressure sensor and an ultrasonic diagnostic system. We formulated a 1D model derived from the Navier-Stokes equations and a continuity equation to characterize pressure propagation in flexible tubes...

... computational fluid dynamics flow separation flow simulation Navier-Stokes equations numerical analysis physiological models pulsatile flow viscosity vortices 09 09 2010 07 03 2011 09 03 2011 07 04 2011 07 04 2011 Normalized axial velocity profiles are shown in Fig. 4...

..., was not used in previous studies of peristalsis in living organisms. In the present investigation, a numerical simulation is introduced and solved through ALE formulation to perform the ureteral flow and stress analysis. The incompressible Navier–Stokes equations are used as the governing equations...

.... For the fluid part, the governing equation used was the Navier–Stokes equation; for the porous medium region, the generalized Darcy–Brinkman–Forchheimer extended model was used. For the porous-fluid interface, a stress jump condition was enforced with a continuity of normal stress, and the mass interfacial...

... heat conduction Navier-Stokes equations temperature distribution temperature measurement reactive hyperemia endothelial dysfunction vascular reactivity noninvasive assessment digital thermal monitoring cardiovascular disease According to the World Health Organization...

... instability haemodynamics momentum Navier-Stokes equations Several parameters are currently used as measures of AV stenosis severity. Peak flow velocity, mean pressure gradient across the AV, and the aortic valve area (AVA) are routinely measured by performing Doppler echocardiography ( 6...

... was modeled by the Navier–Stokes equations, Darcy’s law was employed to model the transmural flow in the arterial wall, mass balance of albumin and LDL was governed by the convection-diffusion mechanism with an additional reaction term in the wall, and the Kedem–Katchalsky equations were applied...

... of nonplanarity in vessel geometry, a curved bypass graft is considered that connects to the host artery with a 90 deg out-of-plane curvature. Navier–Stokes equations are solved using a finite volume method. Velocity and wall shear stress (WSS) are compared between Newtonian and non-Newtonian fluids at different...

... computational fluid dynamics (CFD) simulations. Consequently, the accuracy of these results depends heavily on the anatomical and physiological correctness of these modeling approaches. dynamic geometry coronary arteries Navier–Stokes equations CFD model moving grid cardiac CT biomedical...

... reduction produced by the introduction of catheters at the vessel lumen. The temperature was calculated by solving the energy equation and the Navier–Stokes equations in 2D idealized arterial models. Arterial wall temperature depends on three basic factors: metabolic activity of the inflammatory cells...

... racehorse. Different geometries for inhalation and exhalation were used for the model based on the difference in the nasopharynx size during the two phases of respiration. The Reynolds averaged Navier–Stokes equations were solved for the isothermal flow with the standard k - ϵ model for turbulence...

... that facilitates a better understanding of the complex interactions between detachable coils and the local blood flow. In particular, a semiheuristic porous media set of equations used to describe the intra-aneurysmal flow is coupled to the incompressible Navier–Stokes equations governing the dynamics of the flow...

..., coupled to the free-surface Navier-Stokes equations. The resulting three-dimensional, fluid-structure-interaction problem is solved numerically by a fully coupled finite element method. Our study focuses on the effects of fluid inertia, which has been neglected in most previous studies. The importance...

... for arterial wall motion due to fluid-wall interactions, a shear thinning fluid model of blood, a vascular bed model for outflow boundary conditions, and a model for autoregulation mechanism. The three-dimensional unsteady incompressible Navier-Stokes equations coupled with these models were solved iteratively...

... physiological models Navier-Stokes equations finite element analysis dispersion finite element single path lungs One-dimensional, single-path models are a well-established framework for simulating the transport of respiratory as well as xenobiotic gases in lung airways. The underlying...

... A and B] 14 12 2004 31 03 2005 haemodynamics prosthetics valves computational fluid dynamics laminar flow turbulence cardiovascular system statistical analysis Navier-Stokes equations flow simulation numerical analysis For over 50 years various types...

...Hideki Fujioka; James B. Grotberg In this study, we investigate the steady propagation of a liquid plug within a two-dimensional channel lined by a uniform, thin liquid film. The Navier-Stokes equations with free-surface boundary conditions are solved using the finite volume numerical scheme. We...

...Dalin Tang; Chun Yang; Shunichi Kobayashi; David N. Ku Nonlinear 3-D models with fluid-structure interactions (FSI) based on in vitro experiments are introduced and solved by ADINA to perform flow and stress/strain analysis for stenotic arteries with lipid cores. Navier-Stokes equations are used...

... presents a new model to simulate mass transfer in artificial kidney by coupling together shell-side, lumen-side, and transmembrane flows. Darcy’s equations were employed to simulate shell-side flow, Navier-Stokes equations were employed to simulate lumen-side flow, and Kedem-Katchalsky equations were used...

...Sonu S. Varghese; Steven H. Frankel Pulsatile turbulent flow in stenotic vessels has been numerically modeled using the Reynolds-averaged Navier-Stokes equation approach. The commercially available computational fluid dynamics code (CFD), FLUENT, has been used for these studies. Two different...