HOGAN, Brenna; SHEN, Zaiyi; ZHANG, Hengdi; MISBAH, Chaouqi; BARAKAT, Abdul

doi:10.1007/s10237-019-01130-8

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HOGAN, Brenna
Laboratoire d'hydrodynamique [LadHyX]

SHEN, Zaiyi
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

ZHANG, Hengdi
Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] [LIPhy]

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Biomechanics and Modeling in Mechanobiology. 2019-08, vol. 18, n° 4, p. 1095-1109

Springer Verlag

Résumé en anglais

The effect of red blood cells and the undulation of the endothelium on the shear stress in the microvasculature is studied numerically using the lattice Boltzmann-immersed boundary method (LB-IBM). The results demonstrate a significant effect of both the undulation of the endothelium and red blood cells on wall shear stress. Our results also reveal that morphological alterations of red blood cells, as occur in certain pathologies, can significantly affect the values of wall shear stress. The resulting fluctuations in wall shear stress greatly exceed the nominal values, emphasizing the importance of the particulate nature of blood as well as a more realistic description of vessel wall geometry in the study of hemodynamic forces. We find that within the channel widths investigated, which correspond to those found in the microvasculature, the inverse minimum distance normalized to the channel width between the red blood cell and the wall is predictive of the maximum wall shear stress observed in straight channels with a flowing red blood cell. We find that the maximum wall shear stress varies several factors more over a range of capillary numbers (dimen< Réduire

Mots clés en anglais

Hemodynamic Forces

Shear Stress

Endothelium

Red Blood Cells

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Shear stress in the microvasculature: influence of red blood cell morphology and endothelial wall undulation

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