Reduce U_gas from 4.0 to 2.4 cm/sec, holding U_liquid at 0.1 cm/sec.

• Bubbly mixture in the bed and above the bed.
• Foam retreats.
• Particles fluidize, but cannot penetrate the foam barrier.

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• Foam interface rises well above the fluidized particles.

  One dimensional two-phase, two-phase flow looks good to us.
  

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