Two neutrally buoyant balls interact in a bounded shear flow of an Oldroyd-B fluid: Chaining and tumbling
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Two neutrally buoyant balls interact in a bounded shear flow of an Oldroyd-B fluid under creeping conditions: Two balls first form a chain and then tumble. The initial vertical distances from the midplane are both 0.0316.
- The dimension of computational domain = (-1, 1)x(-1,1)x(-0.5,0.5).
- The radius of the balls is 0.1.
- The density of the balls = 1.
- The density of fluid = 1.
- The viscosity = 1.
- The relaxation time =0.5.
- The retardation time =0.5/8.
- The shear rate = 1.
- Two walls move in opposite directions with the same speed.
- The initial mass centers are at (-0.2, 0, 0.0316) and (0.2, 0, -0.0316), respectively.
- The mesh size for the velocity field = 1/48
- The mesh size for the pressure = 1/24
- The time step=0.001.
- The Deborah Number (the shear rate x the relaxation time)= 0.5.