Abstract
The interface between the Left Ventricle (LV) and the apically-placed cannula is a critical link in the hemodynamic performance of Left Ventricular Assist Devices (LVADs). Yet, this interface has not received much formal attention; the hemodynamics and anatomic interaction within the LV apex is virtually unknown. Due to the high likelihood of mural thrombosis and endocardial trauma - especially with turbodynamic circulatory support - we undertook a numerical study to elucidate the associated hemodynamics. The flow field is solved numerically using commercially available Computational Fluid Dynamics (CFD) software. The blood is treated as a Newtonian fluid, governed by the incompressible Navier-Stokes (N-S) equations. The cannula tip was considered to be rigid, and the ventricular walls were compliant, yet with prescribed motion. Flow features of particular interests are recirculation and the stagnation regions in crevices between the cannula tip and endocardial surface. These results are compared to previously-acquired flow-visualization results (Antaki et al.), and entail comparative evaluation of various ventricular geometries with different cannula tips. Our subsequent studies will extend these simulations to consider coupled fluid-structure interaction to thereby accurately simulate the phenomena associated with suction.
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