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Table 1 Comparison of the peak magnitude and position of the vorticity fluctuation in three directions

From: Numerical analysis of turbulence characteristics in a flat-plate flow with riblets control

Peak magnitude and maximum offset

symbol

x-direction

y-direction

z-direction

Smooth flat-plate case

|w’|•δ99/u

1.65

2.05

——

Riblets flat-plate case

1.32

4.28

2.78

Incremental percentage

-20%

 + 109%

——

Smooth flat-plate case

y99

0.033

0.024

——

Riblets flat-plate case

0.082

0.052

0.061

Wall-normal offset

Δy99

 + 0.049

 + 0.028

——