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Resolution requirements for large eddy simulation (LES), estimated by Chapman AIAA J. 17, 1293 (1979), are modified using accurate formulae for high Reynolds number boundary layer flow. The new estimates indicate that the number of grid points (N) required for wall-modeled LES is proportional to ReLx, but a wall-resolving LES requires ÑReLx13/7, where Lx is the flat-plate length in the streamwise direction. On the other hand, direct numerical simulation, resolving the Kolmogorov length scale, requires ÑReLx37/14.
Choi et al. (Sun,) studied this question.