CFD & FSI Simulations

Cardiac FSI

Fluid-Structure Interaction (FSI) simulations are extensively used to

  • Support the design of cardiovascular implants which involve components which are highly deformable under fluid force
  • Understand the flow behavior around the heart valves and defects such as aneurysms, PFO, ASD etc.

Highly deformable and dynamic structures in the cardiovascular system (such as heart valves) necessitate accurate and conservative FSI approaches to achieve the results medical device designers and diagnostics/decision-makers can rely on. FlowVision's SGGR ensures the maximum resolution on the domain walls, which is important for Wall Shear Stress (WSS) calculations. 

A directly coupled conservative FSI approach with a smooth user experience let engineers focus on the real physics through cutting the tremendous amount of preparation time for simulations and also ensures stable FSI simulations.

What is unique in FlowVision & ABAQUS FSI?

What FlowVision CFD & Abaqus FEA (Dassault Systèmes) coupling offers is a connection between FE and CFD meshes without introducing any intermediate structures into the FSI layer. This allows to link different mesh types with different discretization levels and ensures a fully conservative (no data loss) bi-directional data transfer between structure and fluid simulation domains. The approximation accuracy of the governing equations in each code is maintained in both simulation domains and the FSI layer. This eventually helps the device designers and cardiac researchers to perform the most challenging FSI simulations in an extremely accurate manner and without the conventional FSI burden.

Medical Imaging Based CFD/FSI Simulations

Thanks to the latest advancements in the medical imaging technologies, it is now possible to obtain accurate 4D representations of the cardiovascular structures. These representations are “one-click” imported to FlowVision and patient-specific CFD is conducted. Be it a digital cardiac device implantation or complete heart simulations to reveal flow anomalies; patient-specific, medical imaging based CFD/FSI with FlowVision is both reliable and engineer friendly. FlowVision relies on its native technologies for medical imaging based simulations. This means, the proven FlowVision technology that has been being developed for different industries for more than 25 years, is readily applicable to these simulations without the necessity of any special treatment. As an example, Gap Model, a leakage model to solve dimensionality issues in CFD simulations is extensively applied in cardiac simulations.

Living Heart Project

The Living Heart Project (LHP) aims at developing and validating highly accurate patient-specific digital human heart models. Led by Dassault Systèmes and conducted by a large group of highly qualified cardiovascular researchers, educators, medical device developers, regulatory agencies, and practicing cardiologists; this project focuses on developing models which serve as a technology base for medical device design, clinical diagnosis, education, training. Project Web Page

Capvidia is the CFD simulation partner of the Living Heart Project aiming to integrate FlowVision and Abaqus for a realistic simulation of blood flow in a beating human heart taking into consideration the fluid-structure interaction between blood, heart tissues and artificial mechanical valves.

While the early simulations covered fluid controlled motion of rigid heart valves, today multiphysics whole heart simulations are executed based on LHHM (Living Heart Human Model) which is a high-fidelity multiphysics heart model with the proximal vasculature. Finally, coupling LHHM's existing electro-mechanical simulation framework with FlowVision 3D blood modeling takes the value of these simulations even one step further with greater potential to help medical device design and clinical decision making processes.

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