April 26, 2024 at 9:09 am
Tim LS
Subscriber

So, I am trying to model a flotation column. The UDSs are supposed to account for the amount of oil in each phase. That is, UDS_0 is the number of oil droplets attached to bubbles, while UDS_1 is the number of oil droplets in the water phase. The process is semi-batch, where the air enters and leaves the column contineously, while the oil is added as a batch in the start of the process. Hence, UDS_1 is initialized to some value in the whole domain, while UDS_0 is initialized to 0. The initial condition of the column is a column of only water and oil.

When I run the simulation UDS_0 increases very quickly, while UDS_1 alsmot doesnt change at all. I would expect them to chenge with equal, but opposite magnitude as all the oil the leaves the water phase shoud enter/get attached to the air phase. Also, I observe that UDS_0 cange quickly in regions where there are almost no air.

I printed my source terms while running, and they seem to be of equal magnitude but opposite sign. 

Do you have any idea what I might be doing wrong? 

 

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