Modeling a droplet formation

Hello,

I am currently trying to model in 3D droplet formation such as T-junction.
Attached file is my model.
This model was simplified to calculate my comuputer.
I want to calculate large model if possible.
However, a large amount of memory is needed to calculate the large model.
I have adjusted the solver setting.
As one example, I used to segregated solver for save memory.
But, my approach was not sufficiently effective for saving memory.
Please help me.
Thank you so much.