Verification of a self-developed CFD code for channel turbulence simulation

Abstract 3-D DNS code based on Message Passing Interface (MPI) is developed to study channel turbulence. To solve 3-D conservative Navier-Stokes equations, the WENO-SYMBO3 method and the third-order Runge-Kutta method are adopted for spatial derivative and temporal integration, respectively. The WENO-SYSBO3 method is able to lower the dissipation errors during the discretization process and simulate turbulent flows more accurately. Meanwhile, as a shock-capturing scheme, it can accurately capture flow discontinuities. Therefore, it has unique advantages in compressible flow simulations. Typical flow problems, i.e. supersonic wind tunnel with a front step, supersonic uniform flow around a cylinder, and 2-D Poiseuille flow are conducted to validate the code’s performance. Channel turbulence was simulated through the code. The outcomes reveal that the average temperature within the wall boundary layer increases, the average density decreases, and both the turbulence intensity and the correlation coefficient increase significantly.