2017/12/11 by Pooyan Razi, Razi, Pooyan
Engineering · Environmental Science · #Aerodynamics and Acoustics in Jet Flows #Computational Fluid Dynamics and Aerodynamics #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Turbulent Flows #Wind and Air Flow Studies
paper · pdf · doi:10.48550/arxiv.1712.03796
openalex publication_date 2017/12/11 · openalex created_date 2022/09/30 · openalex updated_date 2026/07/28
The goal of this dissertation is to investigate the PANS model capabilities\nin providing significant improvement over RANS predictions at slightly higher\ncomputational expense and producing LES quality results at significantly lower\ncomputational cost. The objectives of this study are: (i) investigate the model\nfidelity at a fixed level of scale resolution (Generation1-PANS/G1-PANS) for\nsmooth surface separation, (ii) Derive the PANS closure model in regions of\nresolution variation (Generation2-PANS/G2-PANS), and (iii) Validate G2-PANS\nmodel for attached and separated flows. The separated flows considered in this\nstudy have been designated as critical benchmark flows by NASA CFD study group.\n The key contributions of this dissertation are summarized as follows. The\nturbulence closure model of varying resolution, G2-PANS, is developed by\nderiving mathematically-consistent commutation residues and using energy\nconservation principles. The log-layer recovery and accurate computation of\nReynolds stress anisotropy is accomplished by transitioning from steady RANS to\nscaled resolved simulations using the G2-PANS model. Finally, several\nsmooth-separation flows on the NASA turbulence website have been computed with\nhigh degree of accuracy at a significantly reduced computational effort over\nLES using the G1-PANS and G2-PANS models.\n