larger scale anim of • Blender Fluid Simulation - Barrier . I hope the you can see the (faked) large scale of the fluid simulation.
The facts:
domain resolution = 250
end time = 10 seconds
world size = 5m
baked at 50fps, and rendered at 25fps.
If it doesn't look like a 20m long domain box, it certainly doesn't look like 5m either... ;)