Peclet Number

Judge whether advection or diffusion dominates transport.

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

Pecletadvectiondiffusion

formula

KaTeX rendered

\begin{aligned}\text{Pe = U L / alpha}\end{aligned}

ASCII source

Pe = U L / alpha

U (m/s)L (m)alpha (m^2/s)

3.571e+5

transport mode

advection-dominated

Large Peclet number means the scalar travels mainly by advection. Low Peclet number indicates diffusion smooths the field rapidly.

Peclet advection diffusion