Direct numerical simulations of turbulent channel flows with spanwise moving wall

The influence of spanwise moving wall on turbulent channel flows is investigated using direct numerical simulations (DNS), which in order to know the characteristics of turbulent channel flows when existing spanwise moving velocity. The DNS is performed using the standard spectral method. Three cases with the spanwise wall moving velocity which equals 0, bulk flow velocity and double bulk flow velocity are simulated at constant mass flow rate. The results show that spanwise moving wall induce the skin friction increasing. The second-order turbulence statistics such as root-mean-square velocity fluctuations, Reynolds shear stress and root-mean-square vorticity fluctuations are substantial increase with spanwise velocity increasing. It is also observed that the root-mean-square velocity fluctuations become more even across the channel with spanwise velocity increasing.