The target is boundary layers at relatively low Reynolds numbers. The correction is simple and only alters the constant, so that the calibration of the original model in free shear flows and in high-Reynolds-number boundary layers is preserved. Its effect vanishes for momentum-thickness Reynolds number larger than about 5000, in the flat-plate boundary layer. Below 5000, the agreement with experiment for skin friction is strongly improved, and the differences, which reach 15% for the original Spalart–Allmaras model, are now of the order of the experimental uncertainty. The alteration of the logarithmic law is negligible. Ultimately at very high Reynolds number, the new model shifts the curve of versus the streamwise Reynolds number to the left by units of . On the other hand, the effect on channel flow is to introduce an excess of skin friction of a few percent.
Correction to the Spalart–Allmaras Turbulence Model, Providing More Accurate Skin Friction
AIAA Journal ; 58 , 5 ; 1903-1905
2020-04-13
3 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch