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Younglin's CFD Blog
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Moody Chart Explorer

Plot Reynolds number and relative roughness on a Moody chart to read the friction-factor regime visually.

visual calculatorInternal Flow & Losses

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.

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input scale
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model
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check
Moody chartpipe flowfriction factorroughness
formula
KaTeX rendered
f = 64/Re or Colebrook-Whiteplotted against Re and epsilon/D\begin{aligned}\text{f = 64/Re or Colebrook-White}\\[0.35em]\text{plotted against Re and epsilon/D}\end{aligned}
ASCII sourcef = 64/Re or Colebrook-White, plotted against Re and epsilon/D
1e31e41e51e61e71e80.010.020.040.08Darcy friction factor mapcurves: relative roughness epsilon / DlaminartransitionturbulentReynolds numberDarcy f
Darcy f
0.01851
regime
turbulent
head loss per D / q
0.00926

The marker shows where your pipe case sits. Move Re and roughness to see why smooth turbulent flow and rough turbulent flow diverge.

Moody chartpipe flowfriction factorroughness