Learning Forum

[Rob]

That's why I gave you a reading list! ;)   In the experiment burrs on geometry, fingerprints on the materials, sunlight etc can cause this. In the CFD model mesh and solver numerics can trigger the initial asymmetry, and once the flow becomes asymmetric the pressure field that's created will amplify the effect: if other flow features are present/absent the flow may return to the symmetric position or oscillate from left to right with time.