Drag Reduction Characteristics of New Groove Surface with Different Groove Sizes Distribution

For the new V-groove surface with different groove sizes distribution, the drag reduction characteristic of turbulent boundary layer is studied. According to the particularity of the new groove shape, the computation region, grids and flow parameters are dealt with reasonably during the numerical simulation. The flow in turbulent boundary layer and the viscous drag over the groove surface are numerically simulated using the N-S formula and RNG  k-ε turbulence model. Compared with popular simple size groove surface and smooth surface, better drag reduction characteristics can be achieved on the new groove surface with a maximum drag reduction almost 15%. The new groove structure is in favor of second vortex formation and development, which fundamentally resulting in the drag reduction.