Near-wall turbulence generation in wall-modeled LES

This talk discusses how near-wall turbulence is generated in wall-modeled LES (WMLES). Although WMLES has been widely used as an efficient methodology to predict high Reynolds number turbulent flows, the mechanisms of near-wall turbulence generation in WMLES have not been fully understood. Generally, the coherent structures exist in the near-wall region of the turbulent boundary layer and play a crutial role in turbulence production. However, the near-wall turbulence structures simulated by WMLES are not obvious because the typical inner-layer streaks are not resolved in the WMLES. The statistics and mechanisms of the near-wall turbulence structures in WMLES are elucidated by using a conditional-averaging technique, and the turbulence generation mechanisms in WMLES are discussed.