Key result
Computational simulations revealed that large distal tears minimize pressure differences between true and false lumens, whereas a single proximal tear maximizes this pressure difference to 390 Pa.
A monolithic arbitrary Lagrangian/Eulerian fluid-structure interaction model can be used to simulate the complex fluid dynamics and intimal flap flexibility in type B aortic dissection.
In the present work, we perform numerical simulations of the fluid flow in type B aortic dissection (AD), accounting for the flexibility of the intimal flap. The interaction of the flow with the intimal flap is modeled using a monolithic arbitrary Lagrangian/Eulerian fluid-structure interaction model. The model relies on choosing velocity as the kinematic variable in both domains (fluid and solid) facilitating the coupling. The fluid flow velocity and pressure evolution at different locations is studied and compared against the experimental evidence and the formerly published numerical simulation results. Several tear configurations are analyzed. Details of the fluid flow in the vicinity of the tears are highlighted. Influence of the tear size upon the fluid flow and the flap deformation is discussed.
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Ryzhakov et al. (2019) studied Type B aortic dissection. Tear size configurations (10-10, 10-4, 10-0 mm) vs. Different tear sizes and rigid flap model was evaluated on Pressure difference between true and false lumen and fluid flow velocity. Computational simulations revealed that large distal tears minimize pressure differences between true and false lumens, whereas a single proximal tear maximizes this pressure difference to 390 Pa.
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