Investigation of Grey Area Construction on the Performance of Detached Eddy Simuation
Swetha Panguluri, Daniel A. Reasor, and Raymond P. LeBeau, Jr., Dept. of Mechanical Engineering, University of Kentucky
Since its introduction in 1997, the use of Detached Eddy Simulation (DES) and similar hybrid turbulence techniques have become increasingly popular in the field of CFD. However, with increased use some of the limitations of the DES model have become apparent. One of these is the dependence of DES on grid construction, particularly regarding the point of transition between the Reynolds-Averaged Navier-Stokes and Large Eddy Simulation models. To address this, the originators of the DES approach have recently introduced Delayed Detached Eddy Simulation (DDES), which aims to minimize grey area effects. To investigate the grey area effects, the authors are constructing grid which is highly controlled in order to precisely define the grey area region in an unstructured grid. In order to carry out the simulations on these grids the one equation Spalart-Allmaras(SA) based DES and the Menter’s Shear Stress Transport(SST) based DES turbulence models are implemented in the in-house CFD code UNCLE and efforts are made to validate and compare the results from these simulations to the results by Travin et al. Preliminary results for the Re = 140,000 case are presented in this abstract; additional tests will be presented in the final paper.