I’m hereby attaching velocity plots for solid and gas phases for four different boundary conditions I tried.
(a) NoSlip with 1 m/s.
(b) NoSlip with 5 m/s.
(c) PartialSlip with 5 m/s, transfer coefficient 0.
(d) PartialSlip with 5 m/s, transfer coefficient 1.
A.png and B.png are imposed boundary condition example.
In all these, I’m not seeing any circular type of motion inside the region.
Could you please help me here?