A colloidal dispersion under steady (DC) zigzag shear flow.

#youtube(n4KjvbCYAWk)

  • Simulation parameters
    • CFD Lattice: 128 x 128 x 128 mesh
    • Number of Particles: N = 500
    • Diameter of Particles: D = 8 mesh
    • Volume Fraction: Φ = 0.064
    • Temperature: kBT = 1
    • Shear Rate: 0.01
    • Number of Iteration Steps: 20,000

  • Data plot
   > gnuplot
   ...
   gnuplot> plot "out1" u 1:5 t "viscosity"
dc128_visco.jpg

A colloidal dispersion under oscillatory (AC) zigzag shear flow.

#youtube(ERlpTZ080wU)

  • Simulation parameters
    • CFD Lattice: 128 x 128 x 128 mesh
    • Number of Particles: N = 500
    • Diameter of Particles: D = 8 mesh
    • Volume Fraction: Φ = 0.064
    • Temperature: 0.01
    • Shear Rate: 0.01
    • Frequency: 0.05
    • Number of Iteration Steps: 5,000
  • Data plot
   > gnuplot
   ...
   gnuplot> plot "out2" u 1:6 t "Shear stress", "out2" u 1:2 t "Shear rate"
shea_ac.jpg
viselaN500a.jpg

  • Files needed for reproducing this simulation
    • Input UDF file: fileshear_dc.udf fileshear_ac.udf
    • Define UDF file: filedefine_2.00.udf
    • Command (Remove "./" if you use Windows command prompt. Replace ">&" with "2>" if you use sh, bash or Windows command prompt.)
   > mkdir ./avs_dc
   > mkdir ./avs_dc/avs
   > ./kapsel -Ishear_dc.udf -Ooutput.udf -Ddefine_2.00.udf -Rrestart.udf >& out2

  • Related Papers
    • Takuya Iwashita, Ryoichi Yamamoto, Direct numerical simulations for non-Newtonian rheology of concentrated particle dispersions, cond-mat arXiv:0905.0130