Efficient Alternative for Construction of the Linear System Stemming from Numerical Solution of Heat Transfer Problems via FEM

Table 1

Connectivity matrix for a domain divided into 12 hexahedrons elements with 8 nodes (see Figure 1).

Element	Nodes
	1	2	3	4	5	6	7	8
1	1	2	5	6	13	14	17	18
2	2	3	6	7	14	15	18	19
3	3	4	7	8	15	16	19	20
4	5	6	9	10	17	18	21	22
5	6	7	10	11	18	19	22	23
6	7	8	11	12	19	20	23	24
7	13	14	17	18	25	26	29	30
8	14	15	18	19	26	27	30	31
9	15	16	19	20	27	28	31	32
10	17	18	21	22	29	30	33	34
11	18	19	22	23	30	31	34	35
12	19	20	23	24	31	32	35	36