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Grid Convergence Index
Compute observed order, Richardson extrapolation, and GCI from three-grid solutions.
visual calculatorNumerics & Stability
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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verificationGCIRichardson extrapolationmesh convergence
formula
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GCI_21 = F_s |(phi1 - phi2)/phi1| / (r_21^p - 1)observed p
1.2224
extrapolated phi
0.9750
GCI_21 (%)
5.5147
asymptotic ratio
0.1945
Assumes monotonic three-grid convergence. Treat non-monotonic values as a warning, not a certification.