Elmer > Application examples > Coupled problems > Fluid-Structure-Interaction in hemodynamics
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Fluid-Structure-Interaction in hemodynamics

The FSI-module of Elmer can be used to simulate the pulsatile blood flow in elastic blood vessels.

In addition to the blood transporting function, the larger arteries of human body perform also a cushioning function that transforms the pulsatile flow generated by the left ventricle into a steady flow at the periferial arteries. Arterial elasticity, compliance, is principal determinant of arterial pressure. About a half of the volume of physilogical pulse of blood is transported straight to the perifery during the systolic phase and the rest of the blood is accumulated in the elastic arteries. During the diastolic phase the accumulated blood is moved forward into the circulation system.

The beating heart creates also pressure waves which propagate through aorta and reflects back from periferial circulation and also from all kinds of mechanical and geometrical discontinues like stenosis and bifurcations.

Three picture below shows solutions on pressure pulse propagation in human large arteries, diameter of 20 mm. Wall density is 1100 kg/m3, Young's modulus 4.5E5 Pa, blood density 1050 kg/m3 and blood viscosity 3.5E-3 Pa s. During 5 ms a pressure pulse of 1333 Pa (10 mmHg) is sent in at the inlet of the conduit.

  • The first simulation is a simple 2D axisymmetric simulation.
  • The second is 3D simulation in a one quarter of vessel.
  • The last picture shows a pulsatile flow in a curved artery .
  • Note. The displacements are exaggerated. Color scale represents the pressure.

    Here, you can download an animation of the axisymmetric 2d-results mpeg: [100 kB] and non-linear 3d-analysis mpeg: [128 kB] Animation of the last case you'll find here mpeg: [560 kB]

    Elastic carotid artery


    100 ms pulse, max pressure 8000 Pa.No magnification in the animation.

    Animation (200 ms) mpeg

    Animation2 (200 ms) mpeg