Instability mechanisms initiating laminar–turbulent transition past bioprosthetic aortic valves
Karoline-Marie Bornemann,
Dominik Obrist
Abstract:Bioprosthetic heart valves create turbulent flow during early systole which might be detrimental to their durability and performance. Complex mechanisms in the unsteady and heterogeneous flow field complicate the isolation of specific instability mechanisms. We use linear stability analysis and numerical simulations of the flow in a simplified model to study mechanisms initiating the laminar–turbulent transition. The analysis of a modified Orr–Sommerfeld equation, which includes a model for fluid–structure int… Show more
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