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Title: Inflow/outflow boundary conditions for particle-based blood flow simulations: Application to arterial bifurcations and trees

Journal Article · · PLoS Computational Biology (Online)
 [1];  [2];  [3];  [4];  [2];  [5]
  1. Univ. of Lugano, Lugano (Switzerland)
  2. Brown Univ., Providence, RI (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. Univ. of Lugano, Lugano (Switzerland); Swiss Institute of Bioinformatics, Lausanne (Switzerland)
  5. Univ. of British Columbia, Vancouver, BC (Canada)

When blood flows through a bifurcation, red blood cells (RBCs) travel into side branches at different hematocrit levels, and it is even possible that all RBCs enter into one branch only, leading to a complete separation of plasma and R- BCs. To quantify this phenomenon via particle-based mesoscopic simulations, we developed a general framework for open boundary conditions in multiphase flows that is effective even for high hematocrit levels. The inflow at the inlet is duplicated from a fully developed flow generated in a pilot simulation with periodic boundary conditions. The outflow is controlled by adaptive forces to maintain the flow rate and velocity gradient at fixed values, while the particles leaving the arteriole at the outlet are removed from the system. Upon valida- tion of this approach, we performed systematic 3D simulations to study plasma skimming in arterioles of diameters 20 to 32 microns. For a flow rate ratio 6:1 at the branches, we observed the \all-or-nothing" phenomenon with plasma only entering the low flow rate branch. We then simulated blood-plasma separation in arteriolar bifurcations with different bifurcation angles and same diameter of the daughter branches. Our simulations predict a significant increase in RBC flux through the main daughter branch as the bifurcation angle is increased. Lastly, we demonstrated the new methodology for simulating blood flow in ves- sels with multiple inlets and outlets, constructed using an angiogenesis model.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1229970
Report Number(s):
PNNL-SA-109087; KJ0401000
Journal Information:
PLoS Computational Biology (Online), Vol. 11, Issue 8; ISSN 1553-7358
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (12)

Consistent inlet and outlet boundary conditions for particle methods journal October 2019
Red blood cell distribution in a microvascular network with successive bifurcations journal June 2019
Study of the Partitioning of Red Blood Cells Through Asymmetric Bifurcating Microchannels journal September 2019
Going beyond 20 μ m-sized channels for studying red blood cell phase separation in microfluidic bifurcations journal May 2016
Flow patterns and red blood cell dynamics in a U-bend journal September 2018
Motion, deformation, and aggregation of multiple red blood cells in three-dimensional microvessel bifurcations journal February 2019
Theory and algorithms to compute Helfrich bending forces: a review journal April 2017
Computational Biomechanics of Human Red Blood Cells in Hematological Disorders journal January 2017
Extendable outflow boundary conditions for dissipative particle dynamics simulation journal March 2017
MD/DPD Multiscale Framework for Predicting Morphology and Stresses of Red Blood Cells in Health and Disease journal October 2016
Probing eukaryotic cell mechanics via mesoscopic simulations journal September 2017
Modeling of biomechanics and biorheology of red blood cells in type-2 diabetes mellitus journal April 2017

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