The η-grid sets Δy+ and Δz+ proportional to local Kolmogorov scale η, delivering <1% error versus Cartesian grids but with grid count scaling as Re_τ^2.5 (smooth) or Re_τ^2.0 (riblets) instead of Re_τ^3.
Journal of Computational Physics: X 17 , 100128
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Leveraging unstructured grids for direct numerical simulations of wall turbulence
The η-grid sets Δy+ and Δz+ proportional to local Kolmogorov scale η, delivering <1% error versus Cartesian grids but with grid count scaling as Re_τ^2.5 (smooth) or Re_τ^2.0 (riblets) instead of Re_τ^3.