Multiobjective Optimization of Low-Specific-Speed Multistage Pumps by Using Matrix Analysis and CFD Method

Table 7

Results of different mesh sizes.

Parameter	Mesh size/mm
	1.6	1.8	2.0	2.2	2.4
Grids/10^4	184	129	91	69.4	53.4
Head/m	32.58	32.33	32.17	32.03	31.87
Efficiency 𝜂/%	61.82	61.81	61.77	61.46	60.53
Shaft Power P/kW	1.716	1.706	1.711	1.694	1.686