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electrical activation propagates, the bar contracts dragging the blood around it. This
setup is very useful to calibrate the parameters of the material model.
Figure 10 shows a mid section of an ellipsoid as its walls contracts under the
electromechanical action. The electrical impulse starts at the bottom of the ellip-
soid. The fiber model is created from a linear Streeter rule-based model. This first
preliminary test on the fully coupled scheme allows us to calibrate several material
and electromechanical coupling parameters of the model. In this example, pressure
in the outflow is fixed to the atmospheric one. Finally, it is worth to mention that
calibration of the active stress generation is under way, so muscle contraction is still
not realistic.
5 Conclusions and Future Lines
The final goal of the authors and collaborators is to put in the hands of biomedical
researchers amultiphysics cardiac simulation tool based onHPC-techniques, capable
of efficiently running in thousands of cores a fully-coupled electro-mechanical-fluid
Fig. 8 Comparison of
ejection fraction evolution
for three different Purkinje
models and the two different
Streeter's rule-based fiber
orientation models ST1 and
ST2
LV Ejection Fraction (%)
100
ST1
ST3
80
60
40
20
0
Pk1
Pk2
Pk3
Fiber model
RV Ejection Fraction (%)
100
ST1
ST3
80
60
40
20
0
Pk1
Pk2
Pk3
Fiber model
 
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