Flow through a converging-diverging tube and its implications in occlusive vascular disease

Forrester, John H.

doi:10.31274/rtd-180813-349

Cited by 19 publications

(32 citation statements)

References 14 publications

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“…Young and Tsai (1973) conducted a series of steady flow experiments for various hydrodynamic factors such as pressure drop, separation and turbulence on constriction flow. Comparisons of the present method of computations with the experimental work of Young & Tsai (1973) (Figure 3(a) and 3(c)) and Forrester and Young (1970) (Figure 3(a)) on single constriction flow showed very good agreement.…”

Section: Resultssupporting

confidence: 59%

Numerical study of fluid flow through double bell‐shaped constrictions in a tube

Lee

2002

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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The effects of steady fluid flow through double bell-shaped constrictions in tubes were investigated numerically for the Reynolds number range of 5 to 400. The double constrictions studied were for similar first and second constrictions of 1/3, 1/2 and 2/3. A dimensionless constriction spacing of 1.0 was considered. Study showed that the major part of the mean dimensionless pressure drop in the constricted tube occurs predominantly across the first constriction when flow moves towards the valley region formed by the two constrictions. Minimum pressures along the constricted tubes occurs downstream of each constrictions. When the constriction magnitudes increased, the pressure drop across the same length of the tube increases exponentially. The effect of increasing the Reynolds number for all the constriction values considered here is to increase the spreading of the recirculation region between the valley region of the constrictions. The recirculation region formed between the two constrictions has a deminishing effect on the generation of wall vorticity near the second constriction. The effects are more pronounce when the recirculatory flow from the first constriction has spread over the second constriction. In general, a peak wall vorticity is found slightly upstream of each of the constrictions. When the Reynolds number is increased, the peak wall vorticity increases and its location moved upstream. It is noted for the cases considered here that the peak wall vorticity generated by the first constriction is always greater than the peak wall vorticity generated by the second constriction.

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Section: Resultssupporting

confidence: 59%

Numerical study of fluid flow through double bell‐shaped constrictions in a tube

Lee

2002

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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“…Rapid growth of computer hardware and software technology during the last two decades has given leeway to computational fluid dynamics (CFD) in the biological system; therefore, experimentally impossible and complex problems can be analyzed numerically without significant effort and cost. After the initial numerical study on the hemodynamic characteristics in a stenotic artery by Young [6], many researchers (Forrester and Young, Morgan and Young, Lee and Fung, Deshpande et al, Johnson and Kilpatrick) [7][8][9][10][11] have studied the hemodynamics of a stenotic artery by modeling the stenotic lumen geometry using a smooth curve such as a cosine. But, the lumen of a stenotic artery is not smooth and it is composed of many small valleys and ridges.…”

Section: Introductionmentioning

confidence: 99%

Effects of surface geometry and non-newtonian viscosity on the flow field in arterial stenoses

Jeong

Rhee

2009

J Mech Sci Technol

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Hemodynamics including flow pattern, shear stress, and blood viscosity characteristics has been believed to affect the development and progression of arterial stenosis, but previous studies lack of realistic physiological considerations such as irregular surface geometry, non-Newtonian viscosity characteristics and flow pulsatility. The effects of surface irregularities and non-Newtonian viscosity on flow fields were explored in this study using the arterial stenosis models with 48% arterial occlusions under physiological flow condition. Computational flow dynamics based on the finite volume method was employed for Newtonian and non-Newtonian fluid. The wall shear stresses (WSS) in the irregular surface model were higher compared to those in the smooth surface models. Also, non-Newtonian viscosity characteristics increase the peak WSS significantly. The dimensionless pressure drop and the time averaged WSS in pulsatile flow were higher than those in steady flow. But pulsatility effects on pressure and WSS were less significant compared to non-Newtonian viscosity effects. Therefore, irregular surface geometry and non-Newtonian viscosity characteristics should be considered in predicting pressure drop and WSS in stenotic arteries.

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“…A large number of investigations (experimental as well as numerical computation) have carried out for better understanding of the flow disturbances induced by a locally single stenosis, e.g., Forrest and Young [2], Deshpande et al [3], Ahmed and Giddens [4], Neren [5], Giddens et al [6], Zarins and Glagov [7], Ku [8] and others.…”

Section: Introductionmentioning

confidence: 99%

Effect of constriction height on flow separation in a two-dimensional channel

Layek

Midya

2007

Communications in Nonlinear Science and Numerical Simulation

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Flow through a converging-diverging tube and its implications in occlusive vascular disease

Cited by 19 publications

References 14 publications

Numerical study of fluid flow through double bell‐shaped constrictions in a tube

Numerical study of fluid flow through double bell‐shaped constrictions in a tube

Effects of surface geometry and non-newtonian viscosity on the flow field in arterial stenoses

Effect of constriction height on flow separation in a two-dimensional channel

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