Streamlines

Apply a Stream Tracer filter (looks like a cylinder with flow around it in the Active Variable Controls toolbar). Make sure to select cavity. OpenFOAM in the Pipeline Browser, not Glyph1. To seed along a line, select a Seed type or Line Source. Drag the two gray balls to the desired value, or click “P” to put them where the mouse is. Make sure $z$ is around $0.005$ for both points. Use around $20$ point only, and play with either the Maximum100 Step Length or Maximum Steps in the Maximum Stream Tracer section, then click Apply.

Nicer paths may be obtained by applying a Tube filter onto the StreamTracer1 filter. This filter is found in Filters, Filters, Alphabetical (or Recent, in later runs).