Fig. 3.

a Computational domain ${\mathrm{\Omega }}_{}\subset {\mathbb{R}}^3$ in an idealized slab of ventricular myocardium, partitioned in three subdomains (${\overline{\mathrm{\Omega }}}_{}={\overline{\mathrm{\Omega }}}_1\cup {\overline{\mathrm{\Omega }}}_2\cup {\overline{\mathrm{\Omega }}}_3$), where ${\mathrm{\Gamma }}_{12}$ and ${\mathrm{\Gamma }}_{23}$ denote the interfaces among the corresponding subdomains; (b) Representation of the orthonormal triplet for the myofiber orientations ${\mathbf{f}}_0$ (fiber, in red), ${\mathbf{s}}_0$ (sheet, in blu) and ${\mathbf{n}}_0$ (sheet-normal, in green) in an idealized slab of ventricular tissue