Alya Red CCM: HPC-Based Cardiac Computational Modelling - Selected Topics of Computational and Experimental Fluid Mechanics - page 199

Fig. 10 Motion sequence of an ellipsoid under electromechanical contraction, showing the velocity
vectors of the blood as it moves inside it (mid section)
The simulation platform is Alya. Electrical propagation and mechanical con-
traction is computed and solved in independent modules. The electro-mechanical
coupling is performed along the fiber field, which comes either from images or semi-
empirical models. Blood flow and mesh deformation are solved in a second instance
of Alya. Both instances communicates through MPI.
The HPC tool that has been presented is a powerful platform to test sensitivi-
ties of the cardiac modelling scenario. We have shown that the proposed compu-
tational model can be useful to test exhaustively the sensitivity to various activa-
tion sequences, even for computationally expensive problems, thanks to the use of
HPC programming techniques and resources. At this moment, the wall clock time is
between about two and three orders of magnitude longer than the physical time for
a rabbit size bi-ventricular geometry, with millions of elements and a resolution of