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eng.boundary-layer-Blasius Calculator
Calculates the Blasius boundary layer thickness, displacement thickness, and local skin friction coefficient for laminar flow over a flat plate. The Blasius solution gives boundary layer thickness δ = 5x/√Rex — the first exact solution to the Navier-Stokes equations.
Inputs
X M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
U Inf M S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
Nu M2 S
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
Results
BL thickness δ₉₉ (mm)
Sample size or count used in the calculation.
displacement thickness δ* (mm)
ISP (specific impulse) — rocket engine efficiency in seconds. Higher ISP means more thrust per kilogram of propellant consumed.
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
δ = 5x/√Re_x
Reference formula or conversion factor shown for context.
flow regime
Whether the flow is laminar (smooth, ordered) or turbulent (chaotic). Determined by the Reynolds number: below 2,300 = laminar; above 4,000 = turbulent.