Turbulent Shear Cascade in a Bioreactor Slice (2D)

This is the 2D counterpart to the 3D Rushton-turbine bioreactor simulator, built on a genuinely different mechanism: instead of a scripted circulation loop, it synthesises the turbulent flow itself as a cascade of point vortices whose sizes and speeds follow the real Kolmogorov energy spectrum, from the impeller-scale eddies down to the microscale η computed from the same power-draw physics. Cell particles sample that live vortex field at their own position every frame, differentiate it numerically to get a real local strain rate, and accumulate shear damage independently of the closed-form viability curve — so the particle-tracked viability and mixing-time readouts are an independent check on the formula-based ones, not a re-display of them.