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sci.drag-coefficient-sphere Calculator
Calculates drag force F = ½ρCdAv² and drag coefficient Cd for spheres, cylinders, and streamlined bodies as a function of Reynolds number. Sphere Cd: laminar (Re<0.4) Stokes law Cd=24/Re; turbulent Cd ≈ 0.44; drag crisis at Re ≈ 3×10⁵ drops Cd to 0.1 (dimpled golf ball exploits this).
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
D M
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Rho Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Results
drag coefficient CD
Aerodynamic resistance opposing motion. Drag = 0.5 × rho × v^2 × Cd × A. Doubles with every 41% increase in speed (because it scales with v^2).
drag force FD (N)
Air resistance opposing motion. Drag = ½ρv²CdA. Scales with the SQUARE of velocity — doubling speed quadruples drag. Critical for vehicle fuel efficiency and structural wind loading.
drag area CD·A (m²)
The computed two-dimensional surface area.
FD = CD·½ρv²·A
Reference formula or conversion factor shown for context.
regime
The operating regime — the mode or zone in which the system is currently operating.