Résumés > Panasenko Grigory

The goal of the study is to present the FSI (fluid-structure interaction) CFD (computational fluid dynamics) simulations of the blood flow in the LA (left atrium) for patient-specific geometry of the left atrium appendage (LAA). These simulations are important for the decision making in cardiology and cardiac surgery of the patients with atrial fibrillation. To evaluate the risk of thrombosis in LAA it is important to detect the stagnation zones of the blood flow there, while Doppler measurements in the LAA are challenging.

An FSI model of the blood flow in patient-specific LA is introduced. The simulations including the imaging, segmentation, cleaning (noise reduction), domain generation and FSI computational fluid dynamics within patient-specific LA are provided. The validation of the model is carried out by comparison with the Doppler measurements at the ostium of the LAA. The correlation of the presence of stagnation zones in LAA with the stroke risk is studied. The COMSOL simulations of the FSI model are quite challenging and often the direct application of the code leads to the fail of the convergence. It is pointed out that the two-step computations (rigid wall at the first step, and FSI at the second step) improves the convergence of the latter code.

The results are obtained in the collaboration with Audris Aidietis (Santaris Clinics), Sigita Aidietienė (Santaris Clinics), Oleg Ardatov (Vilnius Tech), Sergijus Borodinas (Vilnius Tech), Rimgaudas Katkus (Santaris Clinics), Kristina Kaulakytė (Vilnius University), Nikolajus Kozulinas (Vilnius University) ,Konstantinas Pileckas (Vilnius University), Gediminas Račkauskas (Santaris Clinics).