Proper Orthogonal Decomposition Analysis of Separated and Reattached Pressure Gradient Flows

Abstract

are discussed. Significant differences are observed in the reconstructed Reynolds stress profiles at the center of the separated shear layer and those close to the reattachment point. The results also indicate that contribution of the energetic structures to the Reynolds stresses is higher at the upstream section of the ribs than in the separated layer. Thiswasattributedtoamoreuniformenergydistributionamongtheproperorthogonaldecompositionmodesinthe separated shear layer than in the upstream section. The distributions of the mean velocity, mixing length, and eddy viscosityatselectedlocationswerealsoanalyzed.Themixing-lengthprofilesintheinnerregionoftheseparatedshear layer do not follow the well-documented linear profile reported for simple near-wall turbulent flows.