Simulating Cardiac Electrophysiology Using Unstructured All-Hexahedra Spectral Elements

Table 2

Details on the degrees of freedom (DOF) and the numbers of nonzero entries of the solution matrices (NNZ) for the human heart subvolume benchmark. Details for CPU-times for PDEs, ODEs, and PDEs + ODEs. Percentages are computed with respect to those of the FEM solution.

Method	(cm)		DOF	NNZ	Mean PCG	CPU-time	CPU-time	Total CPU-time
					iterations	PDEs (s)	ODEs (s)	(PDEs + ODEs) (s)
SEM	0.0100	2	1,215,825	44,221,761	9.0	2.57	2.62	5.19
FEM	0.0025	—	6,290,417	93,516,241	10.2	7.19	9.12	16.31
SEM/FEM	400%	—	19.3%	47.4%	88.5%	35.7%	28.7%	31.8%