How can I fill the bed area?

Hello developers! As shown in the figure, the particles, under initial conditions, do not fill the specified area of the proposed two-dimensional fluidized bed. I wonder why I filled it up? How can I fill the bed area?Hope to get your guidance.thank!

  1. You can generate the particles above the bottom and let the particles settle under gravity.
  2. You can fluidize the particle and slowly defluidize the them by decreasing the gas velocity slowly to zero.
    Both ways you can generate a random packing.
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