Coronary Artery Stenosis & Poiseuille's Law

Blood flow through a vessel depends on far more than how much the vessel has narrowed — it depends on the vessel's radius raised to the fourth power. This simulator lets you drag a coronary artery stenosis slider and watch a 3D cross-section of the vessel visibly narrow, while a live flow-rate readout is computed from the real radius⁴ relationship rather than a linear approximation. A flow-vs-stenosis curve traces the characteristic long flat shoulder followed by a steep cliff, and a particle stream slows dramatically as the narrowing crosses the critical range — visualizing why coronary disease can stay clinically silent through moderate plaque buildup and then produce a sudden, disproportionate collapse in blood supply.