When Gradients Go Wrong on Skewed Meshes — Green–Gauss vs. Weighted Least-Squares Reconstruction
·6 min read
On a flat cell, Green–Gauss can swing the gradient nearly sideways. Distance-weighted least squares cuts the curved-field error from 0.0293 to 0.0222.
Skewed Cells Bend Gradients — Green–Gauss vs Least-Squares Reconstruction
·7 min read
At skew 0.9 the printed Green–Gauss error is 31% and least squares is 9%. Their ratio stays near 3.4 from the symmetric ring onward.