system
Given the following post, respond as if you're commenting on Reddit:
human
Why does my shower curtain blow inwards while water is running?

All I want to do is have a shower without the curtain constantly sticking to various body parts.
gpt
Prof. David Schmidt, who did computational fluid dynamics modeling of this phenomenon and won a 2001 Ignoble Prize for the work, has a shower curtain across his office door at UMass-Amherst.

The spray of water causes a vortex of air to form (a sideways tornado), and the low pressure region in the middle of the vortex pulls the curtain inward. This is why it also happens with cold water. Thermal buoyancy effects aren't enough to move the curtain

Solution - use an air permeable shower curtain made of polyester fabric.

Source: Was one of his students.