When blood is pumped through the aortic valves, it has a time dependent flow with a relatively high speed, resulting in Reynolds numbers between 1500 and 3000. Hence, flow is in the transitional regime between laminar and turbulent flow. Transitional flow contains small scale fluctuations, see Figure 1, and may result in local high deformation rates.
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A Coupled Overlapping Domain Method for the Computation of Transitional Flow Through Artificial Heart Valves
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Verkaik, AC, Bogaerds, ACB, Storti, F, & van de Vosse, FN. "A Coupled Overlapping Domain Method for the Computation of Transitional Flow Through Artificial Heart Valves." Proceedings of the ASME 2012 Summer Bioengineering Conference. ASME 2012 Summer Bioengineering Conference, Parts A and B. Fajardo, Puerto Rico, USA. June 20–23, 2012. pp. 217-218. ASME. https://doi.org/10.1115/SBC2012-80257
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