virtauslinjan
Virtauslinjan is a term originating from Finnish that translates to "flow line" or "streamline." In physics and engineering, a virtauslinjan is a curve that is instantaneously tangent to the velocity vector of a fluid at every point. Imagine a tiny particle of fluid moving along with the flow. A virtauslinjan is the path that this particle would trace if its velocity direction were to remain constant at each instant.
Virtauslinjan are a conceptual tool used to visualize and analyze fluid motion. They are particularly useful
It is important to distinguish virtauslinjan from pathlines. A pathline is the actual trajectory of a single