How can I get Eulerian Multiphase model converged?
Hi, I am doing Euler-Euler multiphase simulation with two secondary (solid) phase and one primary (gas) phase. This is my model set up:
Vertical Domain (reactor) : 0.038 * 0.45 m
sand (1st solid phase) dim: 0.00024 mm
coal (2st solid phase) dim : 0.00024 mm
mesh size= 0.0024 mm
sand volume fraction: 0.59
coal volume fraction: 0.3 (to have a certain mass of coal by having its density and volume)
First I patched the sand inside the reactor with a defined volume fraction and temperature and gas entered the reactor from bottom and then the model got converged . Then I increased the number of Eulerian phase from 2 to 3 and defined the coal material and its phase interactions along with its volume fraction and temperature inside the reactor domain. But when I am going to define this new solid phase (coal), fluent shows me the following error:
Error: GENERAL-CAR-CDR: invalid argument : improper list
and also the simulation gets diverged, showing floating point exception error.
I tried to handle this issue by changing Under relaxation factors but it still gets diverged. It would be very helpful if anyone could give a few advice on this.