Beyond this point, it also exhibits a decreasing trend in β , with a final value of around 3.2 (corresponding to strong APG conditions), at R e θ ≃ 4010.
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Revisiting History Effects in Adverse-Pressure-Gradient Turbulent Boundary Layers.
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The sentences
The APG boundary layer on the suction side of the wing section exhibits an interesting trend, with progressively increasing values of R e δ ∗ and R e θ in the streamwise direction, but with a maximum value of R e τ ≃ 373.
The rest of the flat-plate cases also show a slightly increasing trend, although not parallel to the one described by the ZPG TBL case.