Partially Averaged Navier-Stokes Modelling of Turbulent Channel Flow with and without Forcing

Paper i proceeding, 2009

Turbulent channel flow is computed using the Partially Averaged Navier-Stokes (PANS) method which is derived from a parent RANS k - e model and controlled by two parameters: the unresolved-to-total ratio of kinetic energy (fk) and of dissipation (f£). Backscatter from a scale-similarity model is used as forcing which is added in the momentum equations in order to trigger resolved turbulence. A combination of the backscatter model with the PANS methodology is evaluated in channel flow. It was found that the PANS model is able to yield reasonable predictions with an appropriate value of fk- In addition, it was demonstrated that adding forcing has the capability of creating more resolved turbulence, especially for small fk.