Two settling balls in an Oldroyd-B fluid:
![[Animation]](1.jpg)
Two sedimenting balls form a vertical chain after drafting, kissing and chaining. Two balls are released one atop the other initially.
- The dimension of computational domain = (0,1.25)x(0,1.25)x(0,4) initially,
then it moves vertically with the center of the lower ball.
- The radii of the balls are 0.1.
- The density of two balls = 1.1
- The density of fluid = 1
- The viscosity = 0.39
- The relaxation time = 0.51282051
- The retardation time = 0.064102564
- The mesh size for the velocity field = 1/48
- The mesh size for the extra stress tensor = 1/48
- The mesh size for the pressure = 1/24
- The time step=0.001
- The averaged terminal speed =1.6415
- The particle Reynolds number = 0.3035 < 1
- The Mack number = 0.6786 < 1
- The Debra number = 1.5173
- The elasticity number = 5