A two-dimensional #uid}structure interaction model of the aortic value
نویسندگان
چکیده
Failure of synthetic heart valves is usually caused by tearing and calci"cation of the lea#ets. Lea#et "ber-reinforcement increases the durability of these values by unloading the delicate parts of the lea#ets, maintaining their physiological functioning. The interaction of the valve with the surrounding #uid is essential when analyzing its functioning. However, the large di!erences in material properties of #uid and structure and the "nite motion of the lea#ets complicate blood}valve interaction modeling. This has, so far, obstructed numerical analyses of valves operating under physiological conditions. A two-dimensional #uid}structure interaction model is presented, which allows the Reynolds number to be within the physiological range, using a "ctitious domain method based on Lagrange multipliers to couple the two phases. The extension to the three-dimensional case is straightforward. The model has been validated experimentally using laser Doppler anemometry for measuring the #uid #ow and digitized high-speed video recordings to visualize the lea#et motion in corresponding geometries. Results show that both the #uid and lea#et behaviour are well predicted for di!erent lea#et thicknesses. ( 2000 Elsevier Science Ltd. All rights reserved.
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