Key result
Unidirectional propagative approach quantifies pressure wave reflections in stented coronary artery flow simulations.
Why the study?
Computational hemodynamic models of the cardiovascular system require well-controlled inlet and outlet boundary conditions, but classical conditions have limitations.
The unidirectional propagative approach offers a new method for modeling nonreflecting boundary conditions in computational simulations of arterial flows.
May advance nonreflecting boundary modeling in arterial simulations; leaves open clinical validation for stented coronaries.
Computational hemodynamic models of the cardiovascular system are often limited to finite segments of the system and therefore need well-controlled inlet and outlet boundary conditions. Classical boundary conditions are measured total pressure or flow rate imposed at the inlet and impedances of RLR, RLC, or LR filters at the outlet. We present a new approach based on an unidirectional propagative approach (UPA) to model the inlet/outlet boundary conditions on the axisymmetric Navier-Stokes equations. This condition is equivalent to a nonreflecting boundary condition in a fluid-structure interaction model of an axisymmetric artery. First we compare the UPA to the best impedance filter (RLC). Second, we apply this approach to a physiological situation, i.e., the presence of a stented segment into a coronary artery. In that case a reflection index is defined which quantifies the amount of pressure waves reflected upon the singularity.
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Bokov et al. (2013) studied Arterial flows. Unidirectional propagative approach (UPA) for boundary conditions vs. Impedance filter (RLC) was evaluated on Reflection index quantifying pressure waves reflected upon the singularity. A unidirectional propagative approach (UPA) for modeling boundary conditions in arterial flow simulations was developed and applied to quantify pressure wave reflections in a stented coronary artery.
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