So, I want to fill a glass with water/fluid, but I want to do from the bottom and am running into some issues.

When the source is covered, it stops filling. I've been told to use divergence, which does seem to work in principle, but it also causes all of the fluid to rise/expand, which i dont want, just want it to happen at the source.

So what is the best way to do this? (using dopnet)