Boundary Layers & External Flow
Every boundary layers & external flow calculator on CalcEngines — each with its formula, a worked example, the standard it follows and the assumptions it makes.
3 calculators in this section
- Boundary Layer Thickness CalculatorVelocity, thermal and concentration boundary-layer thickness on a flat plate at the station you name, laminar or turbulent, with the transition band printed as three stations rather than one line — and with the laminar coefficient 4.9100 obtained by integrating the Blasius equation, not the 5.0 that gets printed everywhere.
- Displacement and Momentum Thickness Calculatorδ*, θ and the shape factor H, with two separate threshold ladders because H = 2.6 is a healthy laminar layer and a turbulent layer on the point of separating — plus the momentum-integral identity C_f/2 = dθ/dx that lets you check your own CFD, and the duct blockage that is the practical reason to compute δ* in the first place.
- Flat Plate Skin Friction CalculatorLocal C_f and average C̄_f side by side, clearly labelled, with the wall shear, the total drag force and the laminar/turbulent split of that drag — because confusing a local coefficient with a plate average is the commonest error on this calculation and it is worth 22 per cent at Re = 2 × 10⁶.