Computational Efficiency of Decoupling Approach in Solving Reactive Transport Model: A Case Study of Pyrite Oxidative Dissolution

Table 5

Comparison of solution time in 2D model using direct solver, UMFPACK.

Maximum element size	Number of elements	Original solution time,	Decoupled solution time,	%
0.04	7800	-	21.033	-
0.05	5036	246.141	11.767	4.78
0.08	2038	43.644	4.141	9.49
0.10	1310	18.095	2.344	12.95
0.12	944	11.032	1.719	15.58
0.15	616	6.062	1.141	18.82
0.20	308	2.672	0.626	20.08
0.25	206	1.750	0.485	23.43
0.30	148	1.344	0.406	27.71

- represents the absence of a result because of an out of memory error during LU factorisation.