i want to start my simulation with a low amount of water and it should increase after some hundred frames more and more. Unfortunately animating the velocity variables is not working that well and scaling the emitter is not working because it´s made of single faces in one object. And i can´t scale the emitting faces with "individual origins" as keyframes. Any workarounds?
One thing you can try is to animate the surface emission, however that would mean that the water would start to appear from more than the object's face. Instead you could have a hidden dup of your emission object that is the actual emission object, scaled down to your minimum flow.
And here is your file with similar.
I'm still downloading 3.0, but probably similar in 2.93.5...
You could try a trick where you have a hidden (non-renderable) collision object that is the same shape as your emitter object, and you could vary its scale to have it interfere more or less.
Another idea is to animate the particle radius:
I finally got blender 3.0 installed. The blender uploader doesn't seem to recognice 3.x file yet, so here is a Dropbox link.