A CFD investigation of steady and pulsatile blood flow through a life-like, three-dimensional bypass graft model

1998 ◽  
Vol 31 ◽  
pp. 168
Author(s):  
J.S. Cole ◽  
M.A. Gillan ◽  
S. Raghunathan
Keyword(s):  
Blood Flow ◽  
Bypass Graft ◽  
Three Dimensional ◽  
Pulsatile Blood Flow ◽  
Flow Through

scholarly journals A Simple Transient Poiseuille-Based Approach to Mimic the Womersley Function and to Model Pulsatile Blood Flow

Dynamics ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 9-17
Author(s):  
Andrea Natale Impiombato ◽  
Giorgio La Civita ◽  
Francesco Orlandi ◽  
Flavia Schwarz Franceschini Zinani ◽  
Luiz Alberto Oliveira Rocha ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Flow ◽  
Boundary Conditions ◽  
Quadratic Function ◽  
Pulsatile Blood Flow ◽  
Flow Through ◽  
Simplified Analysis ◽  
Function Models ◽  
Flow Reversals

As it is known, the Womersley function models velocity as a function of radius and time. It has been widely used to simulate the pulsatile blood flow through circular ducts. In this context, the present study is focused on the introduction of a simple function as an approximation of the Womersley function in order to evaluate its accuracy. This approximation consists of a simple quadratic function, suitable to be implemented in most commercial and non-commercial computational fluid dynamics codes, without the aid of external mathematical libraries. The Womersley function and the new function have been implemented here as boundary conditions in OpenFOAM ESI software (v.1906). The discrepancy between the obtained results proved to be within 0.7%, which fully validates the calculation approach implemented here. This approach is valid when a simplified analysis of the system is pointed out, in which flow reversals are not contemplated.

scholarly journals Characteristics of Pulsatile Blood Flow Through 3-D Geometry of Arterial Stenosis

2015 ◽  
Vol 105 ◽  
pp. 877-884 ◽  
Author(s):  
Khairuzzaman Mamun ◽  
Most. Nasrin Akhter ◽  
Md. Shirazul Hoque Mollah ◽  
Md. Abu Naim Sheikh ◽  
Mohammad Ali
Keyword(s):  
Blood Flow ◽  
Arterial Stenosis ◽  
Pulsatile Blood Flow ◽  
Flow Through

scholarly journals Effect of Intermittency on Pulsatile Blood Flow through a Stenosed Tube.

1999 ◽  
Vol 65 (630) ◽  
pp. 690-697
Author(s):  
Yoshiyuki WAKI ◽  
Takuji ISHIKAWA ◽  
Shuzo OSHIMA ◽  
Ryuichiro YAMANE ◽  
Motoharu HASEGAWA
Keyword(s):  
Blood Flow ◽  
Pulsatile Blood Flow ◽  
Flow Through

General principles of echocardiography

2016 ◽  
Author(s):  
Madalina Garbi ◽  
Jan D’hooge ◽  
Evgeny Shkolnik
Keyword(s):  
Blood Flow ◽  
Image Interpretation ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Post Processing ◽  
Ultrasound Waves ◽  
Advantages And Disadvantages ◽  
Biologic Effects ◽  
Flow Through ◽  
And Function

Echocardiography uses ultrasound waves to generate images of cardiovascular structures and to display information regarding the blood flow through these structures. Knowledge of basic ultrasound principles and current technology is essential for image interpretation and for optimal use of equipment during image acquisition and post-processing. This chapter starts by presenting the physics of ultrasound and the construction and function of instruments. Image formation, optimization, display, presentation, storage, and communication are explained. Advantages and disadvantages of available imaging modes (M-mode, two-dimensional, and three-dimensional) are detailed and imaging artefacts are illustrated. The potential biologic effects of ultrasound and the need for quality assurance are discussed.

Numerical simulation of pulsatile blood flow through asymmetric arterial stenoses under EECP

2006 ◽  
Vol 18 (3) ◽  
pp. 251-256 ◽  
Author(s):  
Jian-hang DU ◽  
Chun-liang WU ◽  
Zhen-sheng ZHENG ◽  
Dai GANG
Keyword(s):  
Numerical Simulation ◽  
Blood Flow ◽  
Pulsatile Blood Flow ◽  
Flow Through ◽  
Arterial Stenoses

Analysis of blood flow in an out-of-plane CABG model

2006 ◽  
Vol 291 (1) ◽  
pp. H283-H295 ◽  
Author(s):  
Meena Sankaranarayanan ◽  
Dhanjoo N. Ghista ◽  
Chua Leok Poh ◽  
Tan Yong Seng ◽  
Ghassan S. Kassab
Keyword(s):  
Blood Flow ◽  
Flow Field ◽  
Cardiac Cycle ◽  
Artery Bypass ◽  
Bypass Graft ◽  
Three Dimensional ◽  
Substantial Effect ◽  
Shear Stresses ◽  
Out Of Plane ◽  
Inflow Conditions

Coronary artery bypass graft (CABG) is a routine surgical treatment for ischemic and infarcted myocardium. A large number of CABG fail postoperatively because of intimal hyperplasia within months or years. The cause of this failure is thought to be partly related to the flow patterns and shear stresses acting on the endothelial cells. An accurate representation of the flow field and associated wall shear stress (WSS) requires a detailed three-dimensional (3D) model of the CABG. The purpose of this study is to present a detailed analysis of blood flow in a 3D aorto/left CABG, bypassing the occluded left anterior descending coronary (LAD) artery. The analysis takes into account the influence of the out-of-plane geometry of the graft. The finite volume technique was employed to model the 3D blood flow pattern to determine the velocity and WSS distributions. This study presents the flow field distributions of the velocity and WSS at four instances of the cardiac cycle, two in systole and two in diastole. Our results reveal that the CABG geometry has a significant effect on the velocity distribution. The axial velocity profiles at different instances of the cardiac cycle exhibit strong skewing; significant secondary flow and vortex structures are seen in the in-plane velocity patterns. The maximum WSS on the bed of the occluded LAD artery opposite to the graft junction is 14 Pa in middiastole, whereas there is a significantly lower and more uniform distribution of WSS on the bed of the anastomosis. The present results indicate that nonplanarity of the blood vessel along with the inflow conditions has a substantial effect on the fluid mechanics of CABG that contribute to the patency of graft.

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