Table 1: Natural frequency of the water tank by the analytical solution and FEM with ψ = 100.

Natural Frequency of Rigid Tank
T0.59 × 0.03	T1.00 × 0.10	T3.00 × 0.20	T6.00 × 0.50

Analytical	FEM	Analytical	FEM	Analytical	FEM	Analytical	FEM
0.458	0.458	0.316	0.314	0.236	0.233	0.186	0.185