Fig. 3

Velocity profiles for different values of Gr with \(t = 1.0\), \(\Pr = 0.71\), \(\omega = \pi /3\) (cosine), \(\omega = \pi /2\) (sine) and \({U_0} = 3.0\). a Primary velocity. b Secondary velocity
Velocity profiles for different values of Gr with \(t = 1.0\), \(\Pr = 0.71\), \(\omega = \pi /3\) (cosine), \(\omega = \pi /2\) (sine) and \({U_0} = 3.0\). a Primary velocity. b Secondary velocity