The viscosities need the specification of the granular temperature
for the 
solids phase.
Here we use an algebraic equation from the granular temperature transport equation. This is only applicable for dense fluidized
beds where the convection and the diffusion term can be neglected
under the premise that production and dissipation of granular energy
are in equilibrium.
 | (14–143) |
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where | |
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The collisional dissipation of energy, 
,
represents the rate of energy dissipation within the 
solids phase due to collisions between particles.
This term is represented by the expression derived by Lun et al. [397]
 | (14–144) |
The transfer of the kinetic energy of random fluctuations in
particle velocity from the 
solids phase
to the 
fluid or solid
phase is represented by 
[205]:
 | (14–145) |
Ansys Fluent allows you to solve for the granular temperature with the following options:
algebraic formulation (the default)
This is obtained by neglecting convection and diffusion in the transport equation (Equation 14–143) [640].
constant granular temperature
This is useful in very dense situations where the random fluctuations are small.
UDF for granular temperature