Six settling disks in a FENE-CR fluid: L=5
Six sedimenting disks form two chains after drafting, kissing and chaining, which is different
from the well known phenomenon called drafting, kissing and tumbling for disks falling
in Newtonian fluid. In the FENE-CR model, the polymer extension limit is set to be L=5 in the function
f(C)=L*L/(L*L-tr(C)) where C is the conformation tensor. The viscoelastic fluid with a shorter polymer
extension limit can not hold all six disks together.
- The dimension of computational domain = (0,1)x(0,7) initially,
then it moves vertically with the center of the lowest disk.
- The radii of the disks are 0.125.
- The density of disks = 1.01
- The density of fluid = 1
- The fluid viscosity = 0.26
- The relaxation time = 1.3
- The retardation time = 1.3/8
- The mesh size for the velocity field = 1/96
- The mesh size for the extra stress tensor = 1/96
- The mesh size for the pressure = 1/48
- The time step=0.0004
- The averaged terminal speed =0.1317
- The particle Reynolds number = 0.1266 < 1
- The Mack number = 0.2944 < 1
- The Debra number = 0.6847
- The elasticity number = 5.408