Validation of RANS second order moment combustion model by direct numerical simulation database

The direct numerical simulation (DNS) of 3-dimensional channel incompressible turbulent reacting flows was carried out using a spectral method. The budget of the terms in the exact correlation equations is obtained from statistical results of DNS database. It is shown that the production term and dissipation term are more important. Furthermore, the RANS second order moment (SOM) turbulent combustion model is validated by DNS database. The modeled values of the diffusion term and production term are close to the exact statistical value in the most regions, but they need modification in the near-wall region. The modeling of the dissipation term needs improvement.