Re-Mach Flow Regime Map

Place Reynolds and Mach numbers on a 2D map to classify viscous and compressibility regimes.

visual calculatorDimensionless Numbers

Read the flow shape before trusting the number.

This page turns a CFD setup into regime, scale, and dominant-effect cues. Adjust the calculator below and compare the moving graphic with the computed result.

input scale

model

check

ReynoldsMachregime mapvisualization

formula

KaTeX rendered

\begin{aligned}\text{x = log10(Re)}\\[0.35em]\text{y = M}\end{aligned}

ASCII source

x = log10(Re), y = M

ReMach

viscous regime

turbulent

compressibility

incompressible

position

Re 1.000e+5, M 0.2500

Use this map as a first-pass setup check: numerical schemes, turbulence models, and boundary conditions change by region.

Reynolds Mach regime map visualization