Fluids & Combustion (real CFD)
Smoke Contained by a Glass Wall
partition wall with an open top gap

A vertical glass partition (open at the top) keeps the smoke on its own side until it finally spills over the gap — demonstrating containment by a barrier.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).