A novel mono-physics particle-based approach for the simulation of cardiovascular fluid-structure interaction problems

• DOI: 10.1016/j.cmpb.2024.108034
• Publication Date: 2024-01-19T19:10:18Z
• Authors: Alessandra Montel...; Sofia Di Leonardo; Enrico Napoli; Gaetano Burriesci
• Keywords: Fluid–structure interaction; Smoothed Particle Hydrodynamics; Pulsatile flow; Benchmark (surveying)

Fluid-structure interaction (FSI) is required in the study of several cardiovascular engineering problems were mutual between pulsatile blood flow and tissue structures essential to establish biomechanics system. Traditional FSI methods are partitioned approaches where two independent solvers, one for fluid structure, asynchronously coupled. This process results into high computational costs. In this work, a new scheme which avoids coupling different solvers presented framework truly incompressible smoothed particle hydrodynamics (ISPH) method. proposed method, ISPH particles contribute define both structural domains solved together unified Solid particles, geometrically defined at beginning simulation, linked through spring bounds with elastic constant providing material Young's modulus. At each iteration, internal forces calculated restore springs resting length. These added predictor step fractional-step procedure used solve momentum continuity equations flows all particles. The method was validated benchmark test case consisting flexible beam immersed channel. Results showed good agreement system approach well-established commercial software, ANSYS®, terms fluid-dynamics deformation. then applied model complex problem, aortic valve operating function. dynamics during opening closing phases compared qualitatively literature results, demonstrating consistency. computationally more efficient than traditional strategies, overcomes some their main drawbacks, such as impossibility simulating correct coaptation phase. Thanks incompressibility scheme, appropriate biological soft tissues. simplicity flexibility also makes it suitable be expanded modelling thromboembolic phenomena.