2D Fluidized Bed of 240 circular particles:

Here we present numerical simulation of 2D fluidized bed of 240 circular particles in a rectangular channel obtained by a distributed Lagrange multipliers/fictitious domain method.

Geometry, parameters, initial and boundary conditions:

• The in-flow condition (resp., out-flow condition) at the bottom (resp., top) of the channel is quasi-uniform, i.e., velocity field is (0,U(t)) with given U(t). On two vertical sides we choose no-slip boundary conditions.
• The x and y dimensions of a closed channel are 3.2 and 16 inches.
• Circular particles are initially located at given positions called crystal configuration.
• Radii of 240 circular particles are 0.125 inch.
• The density of particle is 1.14.
• The density of fluid is 1.
• The viscosity of fluid is 0.01.
• At the beginning, fluid and particles are at rest. U(t) is an increasing function and reaches U in a short a period of time.

Video Animation:

• U=0.25: particles barely move up and repacking process is undergoing.
• U=0.3: particles move up and down. Repacking process is still undergoing.
• U=1.0: particles move up and fluidize.
• U=1.5: particles move up and fluidize.