Aneurysms of saccular shape are usually associated with a slow, almost stagnant blood flow, as well as a consequent emergence of blood clots. Despite the practical importance, there is a lack of computational models that could combine platelet aggregation, precise biorheology, and blood plasma coagulation into one efficient framework. In the present study, we address both the physical and biochemical effects during thrombosis in aneurysms and blood recirculation zones. We use continuum description of the system and partial differential equation-based model that account for fluid dynamics, platelet transport, adhesion and aggregation, and biochemical cascades of plasma coagulation. The study is focused on the role of transport and accumulation of blood cells, including contact interactions between platelets and red blood cells (RBCs), coagulation cascade triggered by activated platelets, and the hematocrit-dependent blood rheology. We validated the model against known experimental benchmarks for in vitro thrombosis. The numerical simulations indicate an important role of RBCs in spatial propagation and temporal dynamics of the aneurysmal thrombus growth. The local hematocrit determines the viscosity of the RBC-rich regions. As a result, a high hematocrit slows down flow circulation and increases the presence of RBCs in the aneurysm. The intensity of the flow in the blood vessel associated with the aneurysm also affects platelet distribution in the system, as well as the steady shape of the thrombus.
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September 2021
Research Article|
September 21 2021
Multiphase continuum modeling of thrombosis in aneurysms and recirculation zones
Anass Bouchnita
;
Anass Bouchnita
1
Department of Integrative Biology, University of Texas at Austin
, Austin, Texas 78712, USA
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Aleksey V. Belyaev
;
Aleksey V. Belyaev
a)
2
Faculty of Physics, M.V. Lomonosov Moscow State University
, 119991 Moscow, Russia
a)Author to whom correspondence should be addressed: aleksey_belyaev@yahoo.com
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Vitaly Volpert
Vitaly Volpert
3
Institut Camille Jordan, UMR 5208 CNRS
, University Lyon 1, 69622 Villeurbanne, France
4
INRIA Team Dracula, INRIA Lyon La Doua
, 69603 Villeurbanne, France
5
Peoples Friendship University of Russia (RUDN University)
, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation
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a)Author to whom correspondence should be addressed: aleksey_belyaev@yahoo.com
Physics of Fluids 33, 093314 (2021)
Article history
Received:
May 20 2021
Accepted:
August 19 2021
Citation
Anass Bouchnita, Aleksey V. Belyaev, Vitaly Volpert; Multiphase continuum modeling of thrombosis in aneurysms and recirculation zones. Physics of Fluids 1 September 2021; 33 (9): 093314. https://doi.org/10.1063/5.0057393
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