Pulsating flow and mass transfer in an asymmetric system of bifurcations

Evegren, Philip; Revstedt, Johan; Fuchs, László

doi:10.1016/j.compfluid.2011.04.015

Cited by 18 publications

(7 citation statements)

References 58 publications

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“…In recent years, the impact of hemodynamic patterns on the development of arteriosclerosis has received increased attention (Chen and Lu 2006 ; Evegren et al. 2011 ; Lantz and Karlsson 2012 ; Liu et al. 2011 ; Morbiducci et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of aortic irregularities on blood flow

Wittberg

Wyk

Fuchs

et al. 2015

Biomech Model Mechanobiol

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Anatomic aortic anomalies are seen in many medical conditions and are known to cause disturbances in blood flow. Turner syndrome (TS) is a genetic disorder occurring only in females where cardiovascular anomalies, particularly of the aorta, are frequently encountered. In this study, numerical simulations are applied to investigate the flow characteristics in four TS patient- related aortic arches (a normal geometry, dilatation, coarctation and elongation of the transverse aorta). The Quemada viscosity model was applied to account for the non-Newtonian behavior of blood. The blood is treated as a mixture consisting of water and red blood cells (RBC) where the RBCs are modeled as a convected scalar. The results show clear geometry effects where the flow structures and RBC distribution are significantly different between the aortas. Transitional flow is observed as a jet is formed due to a constriction in the descending aorta for the coarctation case. RBC dilution is found to vary between the aortas, influencing the WSS. Moreover, the local variations in RBC volume fraction may induce large viscosity variations, stressing the importance of accounting for the non-Newtonian effects.

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Section: Introductionmentioning

confidence: 99%

Effects of aortic irregularities on blood flow

Wittberg

Wyk

Fuchs

et al. 2015

Biomech Model Mechanobiol

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“…Modifica el modelo GPL para incluir la dependencia con el hematocrito, la temperatura y la concentración de TPMA [2,13]. La expresión de la viscosidad está dada por (8).…”

Section: Ley De Poder Modificadounclassified

“…Existen diferentes estudios relacionados con el flujo sanguíneo que muestran modelos de parámetros agrupados y modelos de parámetros distribuidos, para la simulación del comportamiento de sistemas dinámicos mediante una modelización matemática. Ahora bien, con el fin de comprender el comportamiento fisiológico y su mecanismo de control se presentan analogías entre principios hidrodinámicos con circuitos eléctricos, pues la sangre puede presentar comportamiento como un fluido no newtoniano en tanto que su viscosidad varía cuando hay cambios de temperatura en el cuerpo humano, además los vasos sanguíneos son elásticos [2], estos estudios presentan métodos como el de Lattice Boltzmann, elementos finitos [3]. El objetivo de este trabajo es revisar los principales estudios que proporcionan información relacionada con el comportamiento de los flujos newtonianos y no newtonianos, además de las técnicas empleadas para su desarrollo comprendido en la dinámica del flujo en los diferentes torrentes sanguíneos.…”

Section: Introductionunclassified

Modelos newtonianos y no newtonianos asociados al flujo sanguíneo: revisión

Montaño¹,

Rodríguez²,

Camargo³

2018

Vis. Electron.

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El comportamiento y características de la sangre en el sistema circulatorio han generado diversos modelos que pueden ser aplicados para el análisis del flujo sanguíneo, entre los que se incluyen modelos newtonianos y no newtonianos. En esta revisión se presentan once modelos propuestos a partir de parámetros experimentales que incluyen estudios de viscosidad con diferentes velocidades de cizallamiento y densidad asociada a la dinámica de fluidos. Se caracterizaron de acuerdo con métodos, parámetros específicos y valores experimentales utilizados; además, se comparó la eficacia, certeza y precisión de los modelos utilizados.

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“…The dissimilarity in particle trajectories was reported from experiments and CFD simulations for different wall and impaction conditions. Gemi et al (24) and Evegren et al (25) investigated the effects of geometrical asymmetries on the downstream flow and the mass transport in asymmetric geometry. They reported that this asymmetry did not have significant effects on velocity distribution.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Air Flow in Dichotomous Respiratory Channel with Asymmetric Compliance under HFOV Condition

Hirahara

Iwazaki

Ahmmed

et al. 2011

JFST

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Gas flow in high frequency oscillatory ventilation (HFOV) was numerically investigated. This artificial respiration technique has features of low tidal volume and high frequency. Although molecular diffusion appears to be influential in gas transports at lower airways, the effect of flow convection never vanishes. The present paper is aimed to discuss the contribution of flow convection to gas transports in such lower airways and obtain physical understandings of old air evacuation in the lower airways. For calculating flow in the lower region airway, boundary conditions based on compliance and resistance of airways were introduced. The obtained air flows appeared to be laminar and reversible. However, particle trackings revealed that the pathlines deviated slightly from one respiratory cycle to another, envisaging irreversible trajectories. The Lagrangian analysis also manifested the longitudinal gas redistribution characterized by the incoming central flow and the outgoing near-wall flow. Those effects would be accumulated through repetitive respiration, and result in the effective gas mixing in HFOV.

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Pulsating flow and mass transfer in an asymmetric system of bifurcations

Cited by 18 publications

References 58 publications

Effects of aortic irregularities on blood flow

Effects of aortic irregularities on blood flow

Modelos newtonianos y no newtonianos asociados al flujo sanguíneo: revisión

Numerical Analysis of Air Flow in Dichotomous Respiratory Channel with Asymmetric Compliance under HFOV Condition

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