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Approximate Error Spline (AES) Method for Grid Convergence Error Estimate

Many times it is difficult to determine if your simulation is grid independent. This is especially the case if your are seeing oscillatory convergence. The AES method has been found to provide better estimates of the grid convergence error than the usual Richardson Extrapolation technique. This method was developed by Celik et. al. The papers that were used to develop the excel program are:Celik, I.,
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