Cavitation Number

Measure how close the local pressure drop is to vapor-pressure onset.

visual calculatorMultiphase Flow

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

cavitationvapor pressurehydrodynamics

formula

KaTeX rendered

\begin{aligned}\text{sigma = (p\_inf - p\_v) / (0.5 rho U\^{}2)}\end{aligned}

ASCII source

sigma = (p_inf - p_v) / (0.5 rho U^2)

p_inf (Pa)p_vapor (Pa)rho (kg/m^3)U (m/s)

cavitation number

0.8725

risk level

high cavitation risk

This does not replace a full cavitation model, but it is a good early screening tool for pumps, injectors, valves, and hydrofoils.

cavitation vapor pressure hydrodynamics