Problems Flow Simulation - Free Surface

Hello all,

For a school project, I am working on emptying a tank using SolidWorks Flow Simulation Free Surface. I would like to know how long it takes for a certain amount of water to flow into the tank. Unfortunately, I have not completely succeeded. I used this video: https://www.youtube.com/watch?v=MWRUdaoVN1I&t=1165s to make a simulation. As can be seen in the picture below, the tank is not full, but the water '' hangs ''. Does one of you have an idea why this is coming? Is not there an institution or is it something else? I have all the settings as in the video.

Thanks in advance!

Regards,

Bart

SolidworksFlow Simulation