The heart pumps fluid into the reservoir where interactions between the fluid flow and structure takes place. The compliant reservoir (structure model) expands to accept the fluid and then passes it into the lung. The core of the lung is a fiber bundle which is modeled as a porous medium. The porosity was calculated from the fiber geometry and spacing, and the permeability was measured experimentally.

The excellent results obtained in this FSI analysis were presented by MC3 at the annual conference of the American Society for Artificial Internal Organs (ASAIO).