Flow Regime & Dimensionless Numbers
Every flow regime & dimensionless numbers calculator on CalcEngines — each with its formula, a worked example, the standard it follows and the assumptions it makes.
3 calculators in this section
- Isentropic Flow and Stagnation Conditions CalculatorMach number and the isentropic stagnation ratios — p₀/p, T₀/T, ρ₀/ρ and the area ratio A/A* — for any gas, all explicit in Mach number with no iteration anywhere. Plus the number that actually decides your solver setup: how wrong ½ρV² is at the Mach number you are running, derived rather than quoted.
- Normal Shock CalculatorDownstream Mach number and every jump across a normal shock — p₂/p₁, T₂/T₁, ρ₂/ρ₁, p₀₂/p₀₁ and the entropy rise — all closed form in M₁ and γ, with no iteration. It refuses subsonic upstream flow instead of returning numbers that look plausible, and it says what the shock does to a finite-volume scheme, which is why your grid convergence study came back with an observed order of one.
- Reynolds Number & Flow Regime CalculatorRe for a round pipe, a rectangular duct, an annulus, an open channel, a flat plate, a cylinder or a sphere — with the hydraulic diameter worked out for you, the characteristic length named on the answer, and regime bands that come from the geometry you picked instead of one remembered number.